Patent Grant
10334241
The present invention generally relates to systems and methods for screening cameras for defects and more specifically to systems and methods for screening camera arrays or optic arrays that are used in the construction of camera arrays for defects.
In response to the constraints placed upon a traditional digital camera based upon the camera obscura, a new class of cameras that can be referred to as array cameras has been proposed. Array cameras are characterized in that they include an imager array that has multiple arrays of pixels, where each pixel array is intended to define a focal plane, and each focal plane has a separate lens stack. Typically, each focal plane includes a plurality of rows of pixels that also forms a plurality of columns of pixels, and each focal plane is contained within a region of the imager that does not contain pixels from another focal plane. An image is typically formed on each focal plane by its respective lens stack. In many instances, the array camera is constructed using an imager array that incorporates multiple focal planes and an optic array of lens stacks.
Systems and methods in accordance with embodiments of the invention detect defective camera arrays, and/or optic arrays and/or sensors used in the construction of array camera modules. One embodiment of the method of the invention includes: capturing image data of a known target using the plurality of cameras, where the image data forms a plurality of images; dividing each of the plurality of images into a plurality of corresponding image regions using the image processing system; identifying the presence of at least one localized defect in at least one of the plurality of the cameras by evaluating the image regions in the plurality of images in accordance with at least one predetermined localized defect criterion using the image processing system; detecting a defective camera array using the image processing system when the number of localized defects in a specific set of image regions exceeds a predetermined threshold. In addition, the specific set of image regions is formed by: a common corresponding image region from at least a subset of the plurality of images; and any additional image region in a given image that contains at least one pixel located within a predetermined maximum parallax shift distance along an epipolar line from a pixel within said common corresponding image region within the given image, where the epipolar line is defined by the relative location of the center of the camera that captured the given image and a predetermined viewpoint.
In a further embodiment of the method of the invention, identifying the presence of at least one localized defect in at least one of the plurality of the cameras by evaluating the image regions in the plurality of images in accordance with at least one predetermined localized defect criterion using the image processing system comprises identifying a plurality of defective pixels within an image region that satisfies at least one predetermined criterion.
In another embodiment of the method of the invention, the predetermined criterion is that the plurality of defective pixels within the image region exceeds a predetermined number of defective pixels.
In a still further embodiment of the method of the invention, the predetermined criterion is that the plurality of defective pixels includes a cluster of defective pixels that exceeds a predetermine size.
In still another embodiment of the method of the invention, defective pixels comprise hot pixels, bright pixels and dark pixels.
In a yet further embodiment of the method of the invention, identifying the presence of at least one localized defect in at least one of the plurality of the cameras by evaluating the image regions in the plurality of images in accordance with at least one predetermined localized defect criterion using the image processing system comprises: measuring the Modulation Transfer Function (MTF) within an image region; and determining that the MTF of the image region fails to satisfy a predetermined criterion.
In yet another embodiment of the method of the invention, the predetermined criterion is that the on-axis MTF at a predetermined spatial frequency exceeds a first predetermined threshold, the off-axis tangential MTF at a predetermined spatial frequency exceeds a second predetermined threshold, and the off-axis sagittal MTF at a predetermined spatial frequency exceeds a third predetermined threshold.
In a further embodiment again of the method of the invention, said plurality of corresponding images portions forms a first plurality of corresponding image regions and the method further comprises: dividing each of the plurality of images into a second plurality of corresponding image regions using the image processing system, where the number of image regions in the first plurality of corresponding image regions differs from the number of image regions in the second plurality of corresponding image regions; and identifying the presence of at least one localized defect in at least one of the plurality of the cameras by evaluating the image regions in the second plurality of images in accordance with at least one additional predetermined localized defect criterion using the image processing system.
In another embodiment again of the method of the invention, the plurality of images forms a reference image and a plurality of alternate view images; the specific set of image regions is formed by: a specific image region from the reference image; the image regions from each of the alternate view images that correspond to the specific image region from the reference image; and any additional image region in a given alternate view image from the plurality of alternate view images that contains at least one pixel located within a predetermined maximum parallax shift distance along an epipolar line from a pixel within the image region of the given alternate view image that corresponds to the selected image region from the reference image, where the epipolar line is defined by the relative location of the center of the camera that captured the reference image and the center of the camera that captured the given alternate view image.
In a further additional embodiment of the method of the invention, the plurality of images forms a plurality of images in each of a plurality of color channels; and a specific set of image regions is formed by image regions from the plurality of images within one of the plurality of color channels.
In another additional embodiment of the method of the invention, the plurality of images forms a reference image and a plurality of alternate view images and said plurality of images from one of the plurality of color channels does not include the reference image; and the specific set of image regions is further formed by: the image regions from each of the alternate view images within said one of the plurality of color channels that correspond to a specific image region from the reference image; and any additional image region in a given alternate view image from said one of the plurality of color channels that contains at least one pixel located within a predetermined maximum parallax shift distance along an epipolar line from a pixel within the image region of the given alternate view image that corresponds to the selected image region from the reference image, where the epipolar line is defined by the relative location of the center of the camera that captured the reference image and the center of the camera that captured the given alternate view image.
A still yet further embodiment of the method of the invention also includes detecting a defective camera array using the image processing system when the number of localized defects in a second set of image regions exceeds a second predetermined threshold, where the second set of image regions is formed by image regions from the plurality of images within a second of the plurality of color channels.
In still yet another embodiment of the method of the invention, said predetermined criterion used with respect to said specific set of image regions from said one of the plurality of color channels is different from said second predetermined criterion used with respect to said second set of image regions from said second of the plurality of color channels.
A still further embodiment again of the method of the invention includes dividing the image field of each of the plurality of lens stacks into a plurality of corresponding regions when using an optical test instrument; measuring the Modulation Transfer Function (MTF) of a known target using the optical test instrument in each of the regions; identifying the presence of at least one localized defect in at least one of the plurality of the lens stacks by evaluating the MTF measurements of the regions in the plurality of lens stacks in accordance with at least one predetermined localized defect criterion using the optical test instrument; detecting a defective optic array using the image processing system when the number of localized defects in a specific set of regions exceeds a predetermined threshold. In addition, the specific set of regions is formed by: a common corresponding region from at least a subset of the plurality of lens stacks; and any additional region in a given lens stack that forms an image within a predetermined maximum parallax shift distance along an epipolar line from said common corresponding region within the given lens stack, where the epipolar line is defined by the relative location of the center of the given lens stack and a predetermined viewpoint.
Another further embodiment of the method of the invention includes capturing image data using a camera array comprising a plurality of cameras, where at least one of the plurality of cameras includes a known localized defect impacting image data captured by the camera; disregarding image data within a region of an image captured by the at least one of the plurality of cameras that includes a known localized defect using a processor configured by a super-resolution image processing application, where the discarded image data is from a region of the camera that is known to include said known localized defect; and synthesizing a super-resolution image from the remaining image data captured by the cameras in the camera array using a super-resolution process performed by the processor configured using the super-resolution image processing application.
In still another further embodiment of the method of the invention, the camera array comprises at least one camera known to include at least one defective pixel, and the method further comprises disregarding image data captured by the pixels in the at least one camera that are known to be defective.
Another embodiment of the invention includes: an array camera module comprising a plurality of cameras formed by an imager array comprising a plurality of and an optic array comprising a plurality of lens stacks, where at least one of the plurality of cameras formed by the imager array and optic array includes a known localized defect impacting image data captured by the camera; a processor; and memory containing a super-resolution image processing application and defect data identifying said at least one of the plurality of cameras that includes a known localized defect and a region of the camera that contains the known localized defect. In addition, the super-resolution processing application configures the processor to: capture image data using the array camera module; with respect to each of said at least one of the plurality of cameras that includes a known localized defect, disregarding image data within at least one region identified by the defect data; and synthesizing a super-resolution image from the remaining image data.
In still another embodiment of the invention, memory further comprises defect data identifying at least one defective pixel within the imager array and the super-resolution processing application configures the processor to also disregard image data captured by the at least one pixel identified as defective by said defect data.
Turning now to the drawings, systems and methods for detecting defective camera arrays, and/or optic arrays and/or sensors used in the construction of array camera modules in accordance with embodiments of the invention are illustrated. A variety of defects can arise during the manufacture of a conventional digital camera that captures images using a single aperture including (but not limited to) defects in the camera optics including defects that result in unacceptable Modulation Transfer Function (MTF) performance, defective pixels in the camera's sensor, and/or defects in the assembly of the optics and sensor to form the camera. With respect to the discussion below, the term defect is used to refer to any aspect of a camera (including the sensor, optics, and/or assembly) or optic array that negatively impacts the image formed and/or image data captured by the camera. Even when a defect is localized, the defect can render the camera unsuitable for use, as the localized defect will result in unsatisfactory image quality in the impacted region of every image captured by the camera. As is discussed below, system and methods in accordance with embodiments of the invention utilize knowledge of the image processing used to synthesize images from images captured by camera arrays to determine whether localized defects in specific cameras in an array can be tolerated. In this way, yield can be improved in the manufacture of camera arrays by utilizing camera arrays that contain defects that will not impact the performance of the camera array.
A variety of camera arrays and processes for manufacturing camera arrays are disclosed in U.S. patent application Ser. No. 12/935,504, entitled “Capturing and Processing of Images using Monolithic Camera Array with Heterogeneous Images”, filed May 20, 2009, the disclosure of which is incorporated by reference herein in its entirety. Multiple images of a scene can be captured by a camera array and utilized to synthesize a higher (super-resolution) image of the scene. Fusion and super-resolution processes that can be utilized to generate super-resolution images using images captured by a camera array are disclosed in U.S. patent application Ser. No. 12/967,807, entitled “System and Methods for Synthesizing High Resolution Images Using Super-Resolution Processes”, filed Dec. 14, 2010, the disclosure of which is incorporated herein by reference in its entirety.
A portion of an image synthesized using a super-resolution process typically includes image data from multiple images captured by a camera array. In many instances, the complete set of images captured by a camera array is not required to achieve acceptable image quality in a region of a synthesized image. Manufacture of camera arrays results in many of the same defects that are experienced during the manufacture of conventional cameras. One approach to determining whether a camera array is defective is to identify cameras within the camera array that contain defects and to identify the entire camera array as defective when a predetermined threshold number of defective cameras is exceeded. For array cameras that include sets of cameras that form different color channels, such as those disclosed in U.S. patent application Ser. No. 12/935,504, the number of defective cameras in each color channel can be evaluated with respect to separate predetermined thresholds in order to determine whether the camera array as a whole is defective. For color channels that include fewer cameras, a smaller number of defective cameras may be tolerated. Although rejecting camera arrays as defective based on the number of cameras containing defects is effective, the process may reject camera arrays that could still be utilized to synthesize images of acceptable image quality (despite the presence of a predetermined number of localized defects within a color channel). Increased manufacturing yield can be achieved by identifying the portions of the images captured by the camera array that are impacted by defects of some cameras and evaluating whether sufficient reliable image data remains for that region from all the remaining cameras to synthesize an image. If sufficient reliable image data remains to synthesize an image, then the camera array can be utilized irrespective of the total number of cameras impacted by localized defects.
In several embodiments, a determination that a camera array is defective is made by dividing each of the images of a scene (typically a known target) captured by the cameras in the camera array into corresponding regions and determining which of the regions contain pixels that contain image data which is likely to be fused during image processing to form regions of a synthesized image. In many embodiments, the image processing involves performing a super-resolution process involving parallax detection and correction to synthesize a super-resolved image. In other embodiments, any of a variety of image processing techniques can be utilized including (but not limited to processes that synthesize) stereo-pairs of super-resolution images, video sequences synthesized using a subset of cameras in the camera array, and/or high frame rate video sequences where different frames of video are synthesized using image data captured by different subsets of the camera array. In the event that a predetermined number of the regions that are likely to be fused to form a region of a synthesized image are impacted by localized defects, then the camera array can be determined to be defective. In the context of a super-resolution process, regions that are likely to be fused to form a specific region of a synthesized image can be identified using the maximum parallax shifts that are likely to be observed between images captured by the cameras in the camera array. In several embodiments, one of the cameras in a camera array is selected as a reference camera and the remaining cameras are considered alternate view cameras. In certain embodiments, the reference camera is selected in accordance with criteria including that the reference camera does not include any defects. When a region of an image captured by the reference camera is considered, the maximum parallax shifts along epipolar lines of the pixels in the region define so called “parallax uncertainty zones” within each of the alternate view images. A determination concerning whether a camera array is defective can be made by counting the number of defects impacting pixels within the parallax uncertainty zones associated with each region within the image captured by the reference camera. Where the cameras in a camera array form multiple color channels, separate criteria based upon parallax shifts can be applied to evaluate the impact of the localized defects present in the cameras of each color channel.
As indicated above, a variety of defects can occur during component manufacture and assembly of a camera or camera array. In several embodiments, the process of evaluating whether a camera array is defective can involve evaluation the cameras in the camera array for several different types of defects including (but not limited to) defects in camera optics, defects in the pixels of camera sensors and defects in the assembly of the camera optics and sensors. In a number of embodiments, the size of the regions of the images considered when evaluating the impact of specific types of localized defects can differ. In many embodiments, larger regions are considered when evaluating the camera's optics in a given region of an image captured by the camera than the regions considered when evaluating the impact of defective pixels in the camera's sensor. In general, the smaller the regions considered (i.e. the larger the number of regions considered) during the defect detection process, the higher the anticipated yield up to a point at which the process is: identifying all camera arrays in which the defects present in the camera array can be tolerated by the super-resolution processing; and rejecting all camera arrays as defective where the defects result in insufficient reliable image data for reliably performing super-resolution processing.
Evaluating the likely impact of localized defects based upon anticipated parallax shifts can improve overall manufacturing yields, because camera arrays are not rejected as defective simply based upon a predetermined number of cameras in the camera array containing defects. Similar techniques can be utilized to evaluate optic arrays utilized in the construction of array camera modules (similar to the array camera modules discussed in U.S. patent application Ser. No. 12/935,504). In many embodiments, a Modulation Transfer Function (MTF) measurement can be made with respect to different regions of the images formed by each lens stack in an optic array. MTF is generally the most relevant measurement of optical performance, and is generally taken as an objective measurement of the ability of an optical system to transfer various levels of detail (or spatial frequency) from an object to an image. The MTF is measured in terms of contrast (degrees of gray), or of modulation, produced from a perfect source of that detail level (thus it is the ratio of contrast between the object and the image). The amount of detail in an image is given by the resolution of the optical system, and is customarily specified as spatial frequency in line pairs per millimeter (lp/mm). A line pair is one cycle of a light bar and dark bar of equal width and has a contrast of unity. Contrast can be defined as the ratio of the difference in maximum intensity (Imax) and minimum intensity (Imin) over the sum of Imax and Imin, where Imax is the maximum intensity produced by an image (white) and Imin is the minimum intensity (black). The MTF then is the plot of contrast, measured in percent, against spatial frequency measured in lp/rm. The impact of errors in the lens such as (but not limited to) centering errors, form errors, and/or thickness errors that negatively impact MTF to a point at which the region of a lens stack is considered to contain a defect (i.e. MTF measurements that fail to satisfy one or more predetermined criterion) can be evaluated based upon anticipated parallax shifts during super-resolution processing. In this way, manufacturing yield can be increased by considering the regions of images impacted by defects as opposed to simply the number of defects in an optic array. Systems and methods for detecting defective camera arrays, and/or optic arrays, and techniques for synthesizing super-resolution images from images captured by array cameras containing localized defects in accordance with embodiments of the invention are discussed further below.
Camera Arrays
While much of the discussion that follows refers to systems and methods for screening for defective camera arrays, it is worthwhile initially reviewing the construction of camera arrays, the defects that can occur in the construction of camera arrays, and the manner in which information concerning localized defects can be utilized when synthesizing super-resolution images to avoid corruption of the synthesized super-resolution image by pixels impacted by the localized defects. Camera arrays can be implemented in a variety of ways including (but not limited to) as a set of discrete cameras, or as an array camera. Array cameras typically can include an array camera module and a processor.
An array camera that is configured to synthesize super-resolution images in a manner that involves disregarding image data impacted by localized defects in the cameras in the array camera in accordance with an embodiment of the invention is illustrated in
Although a specific array camera is illustrated in
Array Camera Modules
The defects that can be present in array cameras typically arise from the manner in which array camera modules are constructed. Array camera modules, such as the array camera modules discussed above with respect to
In several embodiments, color filters in individual cameras can be used to form multiple color channels within the array camera module. In this way, cameras can be used to capture data with respect to different colors, or a specific portion of the spectrum. In contrast to applying color filters to the pixels of the camera, color filters in many embodiments of the invention can be included in the lens stack. For example, a green color camera can include a lens stack with a green light filter that allows green light to pass through the optical channel. In many embodiments, the pixels in each focal plane are the same and the light information captured by the pixels is differentiated by the color filters in the corresponding lens stack for each filter plane. Although a specific construction of a camera module with an optic array including color filters in the lens stacks is described above, camera modules can be implemented in a variety of ways including (but not limited to) by applying color filters to the pixels of the focal planes of the camera module similar to the manner in which color filters are applied to the pixels of a camera that uses a conventional Bayer color filter pattern. In several embodiments, at least one of the cameras in the camera module can include uniform color filters applied to the pixels in its focal plane. In many embodiments, a Bayer filter pattern is applied to the pixels of one of the cameras in a camera module. In a number of embodiments, camera modules are constructed in which color filters are utilized in both the lens stacks and on the pixels of the imager array.
The defects that can be present in a camera module include (but are not limited to) defective pixels, a lens stack including one or more lens surfaces that deviate from the relevant prescriptions for the surfaces, and defects associated with the manner in which the sensor and the optic array are combined to form the camera module. The types of defective pixels that may be present can include (but are not limited to) hot pixels (pixels that generate a signal above a predetermined mean dark signal when the sensor array is not illuminated), bright pixels (pixels that produce values that exceed a predetermined threshold above the values produced by neighboring pixels under similar illumination conditions), and dark pixels (pixels that produce values lower than a predetermined threshold below the values produced by neighboring pixels under similar illumination conditions). The specific types of pixel defects that can be detected in accordance with embodiments of the invention typically depend upon the requirements of a specific application. As noted above, a variety of characteristics of the optics of a camera can result in sufficient deterioration to be considered defects in accordance with embodiments of the invention. In many embodiments, defects in a region of a lens can be detected by measuring whether one or both of the tangential and/or sagittal MTF components (sometimes referred to as the horizontal and vertical components) fail to exceed one or more predefined thresholds. Additional defects that can be detected include (but are not limited to) blemishes in the optics and/or that result from assembly. Although specific categories of localized defect are described above, processes in accordance with embodiments of the invention can evaluate the impact of any of a variety of defects that are localized to a region of a camera within a camera array on the performance of the camera array using information concerning the manner in which images will be synthesized from the image data captured by the camera array.
Although specific array camera modules and defects that can occur during the manufacture of array camera modules are discussed above, many different array camera modules can be constructed and systems and methods in accordance with embodiments of the invention can detect the presence of the types of defects that typically arise in the construction of a specific type of array camera module. In order to provide some additional background concerning the operation of imager arrays and the manner in which the imager arrays capture image data for use in super-resolution processing, imager arrays that can be utilized in the construction of array camera modules in accordance with embodiments of the invention are discussed further below.
Imager Arrays
An imager array that can be utilized in the construction of an array camera module and in which the image capture settings of a plurality of focal planes can be independently configured is illustrated in
In many embodiments, a single self-contained chip imager array includes focal plane framing circuitry 312 that packages the data captured from the focal planes into a container file and can prepare the captured image data for transmission. In several embodiments, the focal plane framing circuitry includes information identifying the focal plane and/or group of pixels from which the captured image data originated. In a number of embodiments, the imager array also includes an interface for transmission of captured image data to external devices. In the illustrated embodiment, the interface is a MIPI CSI 2 output interface (as specified by the non-profit MIPI Alliance, Inc.) supporting four lanes that can support read-out of video at 30 fps from the imager array and incorporating data output interface circuitry 318, interface control circuitry 316 and interface input circuitry 314. Typically, the bandwidth of each lane is optimized for the total number of pixels in the imager array and the desired frame rate. The use of various interfaces including the MIPI CSI 2 interface to transmit image data captured by an array of imagers within an imager array to an external device in accordance with embodiments of the invention is described in U.S. Pat. No. 8,305,456, entitled “Systems and Methods for Transmitting Array Camera Data”, issued Nov. 6, 2012, the disclosure of which is incorporated by reference herein in its entirety.
Although specific components of an imager array architecture are discussed above with respect to
Independent Focal Plane Control
Imager arrays in accordance with embodiments of the invention can include an array of focal planes that can independently be controlled. In this way, the image capture settings for each focal plane in an imager array can be configured differently. An imager array including independent control of image capture settings and independent control of pixel readout in an array of focal planes in accordance with an embodiment of the invention is illustrated in
Although specific imager array configurations are discussed above with reference to
Evaluating Defects in Camera Arrays
Camera arrays can capture information in multiple color channels or spectral cameras, where specific cameras are configured to only capture image data within a single color channel or spectral band. A 4×4 camera array that is configured to capture red, green, and blue image data is conceptually illustrated in
Using Bounds on Parallax Shifts to Evaluate Impact of Localized Defects
Systems and methods for screening camera arrays for defects in accordance with many embodiments of the invention attempt to evaluate whether the image data captured by a camera array includes sufficient reliable image data to reliably synthesize a super-resolution image. In several embodiments, the sufficiency of the captured image data is determined by considering the super-resolution image as a set of regions synthesized from image data captured by pixels in regions in each of the images captured by the camera array. While the locations of the regions in the images correspond with the locations of the regions in the super-resolution image, it should be noted that the effects of parallax can mean that a region of a super-resolution image can be synthesized from image data captured from more than just the corresponding regions of the images captured by the camera array. The process of synthesizing a region of the super-resolution image involves shifting all of the image data captured by the cameras in the camera array to the viewpoint from which the super-resolution image is synthesized, which can include shifting image data captured by pixels from multiple regions of a camera. Although much of the discussion that follows assumes that the super-resolution image is synthesized from the viewpoint of a reference camera, super-resolution images can also be synthesized from virtual viewpoints. In which case, parallax corrections are applied to all of the image data.
The reliability with which the region of the super-resolution image can be synthesized based upon captured image data can be evaluated by identifying pixels in the image data that could be utilized to synthesize the super-resolution image and which may be impacted by a localized defect. As noted above, the parallax shifts that are likely to be observed in captured image data are typically bounded. Therefore, these maximum parallax shift bounds can be utilized to identify pixels in image data captured by specific cameras within an array that could be utilized to synthesize a region of a super-resolution image depending upon the nature of a scene. The specific pixels that will be utilized to synthesize a region of a super-resolution image will typically depend upon the distance(s) to objects within the scene that are visible within the synthesized region of the super-resolution image. Regions of the images captured by specific cameras within a camera array that contain pixels that could be utilized to synthesize a region of a super-resolution image (identified based upon the parallax shift bounds) can be referred to as parallax uncertainty zones with respect to the region of the super-resolution image. These parallax uncertainty zones contain the pixels that could be utilized to synthesize the associated region of the super-resolution image under all possible imaging conditions (i.e. across all possible object distances). By identifying the number of localized defects (if any) that impact pixels contained within the parallax uncertainty zones, systems and methods in accordance with embodiments of the invention can identify the amount of image data that must be disregarded during the synthesis of the region of the super-resolution image. If the amount of image data that must be disregarded (i.e. the number of localized defects impacting pixels contained within the parallax uncertainty zones) exceeds a predetermined amount, then the camera array can be determined to be defective for the purpose of synthesizing super-resolution images. Although much of the discussion that follows focuses on synthesizing super-resolution images, similar processes can be utilized to evaluate whether sufficient reliable image data is available to synthesize other types of image(s) such as (but not limited to) stereo-pairs of super-resolution images, and/or video sequences synthesized using a subset of cameras in the camera array.
In order to provide a concrete example of the processes outlined above, a process for determining whether localized defects in the cameras of the 4×4 camera array illustrated in
The identified regions within the alternate view green cameras that contain at least one pixel that could potentially capture image data used to synthesize a given region of the super-resolution image define the parallax uncertainty zones 506 for the given region of the super-resolution image. In
The ability to define parallax uncertainty zones in a predetermined manner can simplify processes for detecting defective camera arrays in accordance with embodiments of the invention during the manufacturing of camera arrays. Processes for determining whether camera arrays are defective can simply involve determining regions of the cameras that contain localized defects and then using lookup tables to identify the parallax uncertainty zones to consider when evaluating whether the localized defects render the overall camera array defective for the purpose of synthesizing a desired type of image(s).
In many embodiments of the invention, the process of evaluating whether a camera array is defective involves evaluating whether regions within parallax uncertainty zones contain localized defects. The regions of a camera that are considered part of a parallax uncertainty zone for a given region of a super-resolution image are regions that contain at least one pixel that could potentially capture image data that could be utilized to synthesize the given region of the super-resolution image under all possible imaging conditions. It is also worth noting that a region that is part of a parallax uncertainty zone can also include pixels that capture image data that will not be utilized by the super-resolution process to synthesize the given region of the super-resolution image under any imaging conditions (i.e. pixels that shift along epipolar lines to different regions of the super-resolution image). For example, region 508 contains such pixels. In the event that the localized defect impacting region 508 does not impact pixels that could potentially capture image data used in the synthesis of the given region of the super-resolution image, then the camera array could theoretically still be used to synthesize super-resolution images of acceptable image quality despite failing to the criterion outlined above. Accordingly, yield can be further increased by reducing the size of the regions (i.e. using more than a 3×3 grid, e.g. a 6×8 grid and/or any other grid appropriate to the requirements of the invention). As is discussed further below, the size of the regions considered can depend upon by the specific type of defect being detected. For example, defective pixels can be identified individually and so very small regions can be considered when evaluating the impact of defective pixels. By contrast, MTF calculations typically require image data captured by a larger number of pixels. Therefore, larger regions may be utilized when evaluating the impact of defects in the lens stacks of optic array of an array camera module. In addition, the size, number and location of the regions for testing the optic array only can be already defined by the setup of the MTF testing equipment, e.g. if optical testing instrument use 9 reticles and corresponding cameras in the tester (on-axis, 4 at intermediate field heights on H and V axes of “image” and 4 in the corners). Accordingly, a single screening process can utilize different sized regions when evaluating the impact of different types of defects as part of the process of determining whether a camera array is sufficiently reliable to be utilized in synthesizing a desired type of image.
The manner in which parallax uncertainty zones are defined with respect to various regions of a super-resolution image can be further appreciated with reference to
The reference camera 500 in the camera array illustrated in
A process for evaluating whether the camera array illustrated in
Although the processes discussed above with respect to
Processes for Detecting Defective Camera Arrays
Processes for manufacturing camera arrays, including (but not limited to) camera arrays implemented using an array camera module, can incorporate processes that screen for defective camera arrays. In many embodiments, the screening processes identify defects and the regions within the cameras in the camera array that capture image data, which are impacted by the identified defects. The process can then count the number of regions impacted by defects within specific sets of regions, where each set of regions constitutes the parallax uncertainty zones for a specific region of a super-resolution image that can be synthesized using image data captured by the camera array. In many embodiments, the specific sets of regions can include different sets for each color channel used to synthesize a region of a super-resolution image. In this way, predetermined parallax uncertainty zones can effectively be defined as a set of look up tables (or similar data structures) without the need to continuously perform the calculations to determine the parallax uncertainty zones (which are typically the same for each similar camera array being manufactured and tested).
A process for screening camera arrays to identify defective camera arrays in accordance with an embodiment of the invention is illustrated in
In a number of embodiments, a reference camera is selected (608). As is discussed further below, processes in accordance with many embodiments of the invention require that the reference camera utilized in the synthesis of super-resolution images be free of localized defects. Accordingly, the process of selecting a reference camera can involve selecting candidate reference cameras and evaluating whether any of the candidate reference cameras are free from defects. In the event that none of the candidate reference cameras are free from defects, the camera array may be rejected.
The process of screening the camera array can then involve identifying (610) defects that impact image data captured by regions within the parallax uncertainty zones of each region of a super-resolution image that can be synthesized using image data captured by the camera array. As noted above, this can involve utilizing look up tables (or similar rapidly accessible data structures) to count the number of defects that occur in specific sets of regions corresponding to the parallax uncertainty zones (in each color channel) for each region of a super-resolution image that can be synthesized using the camera array. The number of defects in each of the specific sets of regions can then be evaluated to determine (612) whether the number exceeds a predetermined threshold. In many embodiments, different thresholds can be defined for different sets of regions. In several embodiments, different thresholds apply to the sets in each of the different color channels supported by the camera array. In embodiments where the number of defects in each instance is sufficiently low to satisfy the thresholds, then the camera array is determined to be capable of synthesizing super-resolution images of acceptable image quality and information concerning the defects can be stored for use by the camera array in the subsequent synthesis of super-resolution images. In this way, information concerning defects can be utilized to disregard image data captured by regions of cameras impacted by the defects during the synthesis of super-resolution images. Processes for synthesizing super-resolution images in this manner are discussed further below. In the event that at least one of the defect counts with respect to a specific set of regions exceeds the predetermined threshold, then the camera array is determined to be defective for the purpose of synthesizing super-resolution images having acceptable image quality.
Although specific process for determining whether a camera array is defective are described above with respect to
Identifying Defective Regions Based Upon Pixel Defects
A region of a camera can be considered defective due the presence of defective pixels within the region. Pixels can be considered defective for reasons including (but not limited to) the pixels being determined to be hot pixels, bright pixels, or dark pixels. Any of a variety of criteria appropriate to the requirements of specific applications can be utilized to determine whether the presence of defective pixels within a region renders the entire region defective for the purpose of evaluating the camera array. In a number of embodiments, the presence of a predetermined number of pixels results in the entire region being considered defective. In several embodiments, the presence of a cluster of defective pixels exceeding a predetermined size within region results in the entire region being considered defective. In certain embodiments, clusters of pixels that are equal to or smaller than a 2×2 cluster of pixels can be tolerated. However, a cluster of pixels that includes three or more pixels in one dimension results in the entire region being considered defective. In other embodiments, the size of defective pixel clusters that can be tolerated is determined based upon the requirements of specific applications.
A process for determining whether the presence of defective pixels results in a region being considered defective for the purpose of evaluating the performance of a camera array in accordance with an embodiment of the invention is illustrated in
Although specific processes for determining whether a region of a camera is defective based upon the characteristics of defective pixels present within the region of the camera are described above, any of a variety of processes utilizing any of a variety of criteria appropriate to the requirements of specific applications can be utilized to determine whether a region of a camera is defective for the purpose of evaluating a camera array based upon the number, type, and/or location of defective pixels within the region in accordance with embodiments of the invention. Processes for evaluating whether a region of a camera is defective utilizing MTF measurements in accordance with embodiments of the invention are discussed below.
Identifying Defective Regions Using MTF Measurements
Defects in the optics of a camera can be identified by performing MTF measurements. In several embodiments, defects in regions of a camera that are attributable to defects in the lens stack of the camera can be detected by performing an MTF measurement for the region. Where the MTF measurement diverges from the anticipated MTF of the optics, then MTF failure can be considered to have occurred within the region and the region can be treated as defective for the purpose of evaluating the overall reliability of the camera array.
A process for determining whether a region of a camera is defective when evaluating the overall reliability of a camera array in accordance with an embodiment of the invention is illustrated in
Although specific processes are described above with reference to
Processes for Selecting a Reference Camera
In many embodiments, the process of synthesizing a super-resolution image involves selection of a reference camera and synthesizing the super-resolution image from the viewpoint of the reference camera. The camera selected as the reference camera plays an important role in the synthesis of the super-resolution image. Therefore, processes in accordance with a number of embodiments of the invention attempt to select a reference camera that is free from defects and will discard a camera array when none of the cameras that can serve as a reference camera are free of defects.
A process for selecting a reference camera in a camera array in accordance with an embodiment of the invention is illustrated in
Although specific processes for selecting a reference camera are discussed above with reference to
Screening Optic Arrays
While much of the discussion above has focused on systems and methods for screening camera arrays for defects that will prevent the synthesis of images having acceptable image quality, similar techniques can be utilized to screen optic arrays manufactured for use in array camera modules in accordance with embodiments of the invention. The MTF in multiple regions of each of the lens stacks in an optic array can be measured using an optical test instrument designed to perform MTF testing, such as (but no limited to) the Image Master® PRO line of products manufactured by Trioptocis GmbH of Wedel, Germany. Furthermore, scripts can be executed on such optical test instruments to detect defective optic arrays using processes that consider the impact that defective regions within the optical array would have on images synthesized using image data captured by a hypothetical array cameras that incorporated the optic array in accordance with embodiments of the invention. Defects in a lens stack can be localized by separately measuring the MTF of each of a number of regions of each lens stack. Parallax uncertainty zones can be defined with respect to the regions of the lens stacks in the optic array in the same way in which they are defined for regions of cameras in a camera array. By counting regions in the parallax uncertainty zones that have MTF measurements that fail to satisfy one or more predetermined MTF criterion, a determination can be made concerning whether the defects in the optics are likely to result in the construction of an array camera module that is incapable of capturing image data from which super-resolution images can be synthesized with acceptable image quality. As with camera arrays, the specific set of regions that forms each parallax uncertainty zone can be stored in a lookup table (or similar data structure) enable rapid retrieval. In this way, counts can be generated and the appropriate threshold applied with respect to each set to determine whether the optic array is defective.
A process for determining whether a lens array is defective in accordance with an embodiment of the invention is illustrated in
The process of screening the optic array can then involve identifying (1008) defects that will impact image data captured within parallax uncertainty zones of each region of a super-resolution image that can be synthesized from the viewpoint of the reference lens stack. As noted above, this can involve utilizing look up tables (or similar rapidly accessible data structures) to count the number of defects that occur in specific sets of regions corresponding to the parallax uncertainty zones (in each color channel) for each region of the reference lens stack. The number of defects in each of the specific sets of regions can then be evaluated to determine (1010) whether the number exceeds a predetermined threshold. In many embodiments, different thresholds can be defined for different sets. In several embodiments, different thresholds apply to the sets in each of the different color channels that will ultimately be formed using the optic array. In embodiments where the number of defects in each instance is sufficiently low to satisfy the thresholds, then the optic array is determined to be suitable for use in the construction of an array camera module. Furthermore, information concerning defects captured during the screening process can be subsequently utilized to disregard image data captured by regions of cameras impacted by the defects in the optic array during the synthesis of super-resolution images. Processes for synthesizing super-resolution images in this manner are discussed further below. In the event that at least one of the defect counts with respect to a specific set of regions exceeds the predetermined threshold, then the optic array is determined to be defective for the purpose of constructing an array camera module.
Although specific processes for determining whether an optic array is defective are described above with respect to
Synthesizing Images Using Camera Arrays Incorporating Defects
Camera arrays that are screened utilizing processes similar to those outlined above and/or that include optic arrays and/or sensors that are screened utilizing processes similar to those outlined above can contain defects. When image data captured by pixels impacted by the defects is utilized to synthesize an image, then a degradation in image quality can result. The process of screening the camera array and/or the optics yields information concerning regions in the cameras and/or lens stacks or sensors containing defects. In several embodiments of the invention, information concerning the defective regions is maintained by the camera array and utilized in the processing of captured image data to synthesize images. In several embodiments, image data captured in a defective region can be disregarded. Where a region is identified as defective, but the location of the specific pixels impacted by the defect is known, only the impacted pixels can be disregarded.
A process for synthesizing a super-resolution image that involves disregarding image data captured by regions and/or pixels impacted by defects in accordance with an embodiment of the invention is illustrated in
Although specific processes for synthesizing super-resolution images are discussed above with respect to
While the above description contains many specific embodiments of the invention, these should not be construed as limitations on the scope of the invention, but rather as an example of one embodiment thereof. It is therefore to be understood that the present invention may be practiced otherwise than specifically described, without departing from the scope and spirit of the present invention. Thus, embodiments of the present invention should be considered in all respects as illustrative and not restrictive.
The current application is a continuation of application Ser. No. 14/805,412 filed Jul. 21, 2015, which is a divisional of application Ser. No. 13/931,724 filed Jun. 28, 2013, which claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application Ser. No. 61/665,724, filed Jun. 28, 2012, the disclosures of which are incorporated herein by reference.
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