Patent Grant
12142005
The three primary autonomous vehicle (AV) sensors are camera, radar and lidar.
Working together, they provide to the AV information about its surroundings and help the AV detect the speed and distance of nearby objects, as well as their three-dimensional shape.
Lidar-based systems provide a real time visualization of the surroundings of the AC based on the distance of each laser point. A computer of the lidar-based system translates the points into a three dimensions (3D) representation and is able to identify other vehicles, humans, roads, buildings, and the like, as a means of enabling the AV to navigate in its surroundings in a safe manner.
The cost of lidar-based system is very high—in order of few magnitude higher than the cost of a cameras—thereby preventing the installation of lidar-based system in most vehicles.
There is a growing need to provide a system that is cost effective and have the capability to generate depth information.
There may be provided systems, methods and computer readable medium as illustrated in the specification.
The embodiments of the disclosure will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, and components have not been described in detail so as not to obscure the present invention.
The subject matter regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, both as to organization and method of operation, together with objects, features, and advantages thereof, may best be understood by reference to the following detailed description when read with the accompanying drawings.
It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.
Because the illustrated embodiments of the present invention may for the most part, be implemented using electronic components and circuits known to those skilled in the art, details will not be explained in any greater extent than that considered necessary as illustrated above, for the understanding and appreciation of the underlying concepts of the present invention and in order not to obfuscate or distract from the teachings of the present invention.
Any reference in the specification to a method should be applied mutatis mutandis to a device or system capable of executing the method and/or to a non-transitory computer readable medium that stores instructions for executing the method.
Any reference in the specification to a system or device should be applied mutatis mutandis to a method that may be executed by the system, and/or may be applied mutatis mutandis to non-transitory computer readable medium that stores instructions executable by the system.
Any reference in the specification to a non-transitory computer readable medium should be applied mutatis mutandis to a device or system capable of executing instructions stored in the non-transitory computer readable medium and/or may be applied mutatis mutandis to a method for executing the instructions.
Any combination of any module or unit listed in any of the figures, any part of the specification and/or any claims may be provided.
The specification and/or drawings may refer to an image. Any reference to an image should be applied mutatis mutandis to a video stream or to one or more images.
The specification and/or drawings may refer to a processor. The processor may be a processing circuitry. The processing circuitry may be implemented as a central processing unit (CPU), and/or one or more other integrated circuits such as application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), full-custom integrated circuits, etc., or a combination of such integrated circuits.
Any combination of any steps of any method illustrated in the specification and/or drawings may be provided.
Any combination of any subject matter of any of claims may be provided.
Any combinations of systems, units, components, processors, sensors, illustrated in the specification and/or drawings may be provided.
The analysis of content of a media unit may be executed by generating a signature of the media unit and by comparing the signature to reference signatures. The reference signatures may be arranged in one or more concept structures or may be arranged in any other manner. The signatures may be used for object detection or for any other use.
The term “substantially” means insignificant deviation—for example differences that do not exceed few percent of a value, differences that are below the accuracy and/or resolution related to the face recognition process. What is substantially may be defined in any manner
An active sensor is a sensor that emits radiation during the sensing process. The radiation may be a light radiation (lidar), radio frequency radiation (radar), acoustic waves (sonar), and the like.
The terms first cameras and second camera are used to indicate that the camera used during a calibration process may differ from the camera used after the calibration process—or may be the same camera.
For simplicity of explanation it is assumed that the active sensor is a lidar.
There may be provide a system, method and a non-transitory computer readable medium for obtaining depth information using images acquired by a camera. The camera is a two-dimensional camera and should not be a three dimensional camera—such as a stereoscopic camera.
The method obtains a mapping between anchors and their appearance in an image to a distance from the camara. An anchor is an object associated with at least one physical dimension of a known value.
The association may mean that the at least one physical dimension is at least one dimension of the object.
The at least one dimension of the object may be any dimension—for example a height, a length, a width, a radius, a diagonal, of the object or any part of the object, and the like. For example—a dimension of a known value of a zebra crossing may be its width.
The association may mean that the at least one physical dimension is a spatial relationship (for example distance) related to parts of the object. For example—a dimension of a known value of a zebra crossing may be a distance between same colored stripes.
The association may mean that the at least one physical dimension is indicative of a spatial relationship (for example—a distance between, an overlap, and the like) between the object to another object. For example—a dimension of a known value of a zebra crossing stripe may be a distance between same colored stripes. Yet for another example—the distance between adjacent road separators
The at least one physical dimension of is of known value may of an exact value may be known (for example—a width of an object may be 40 centimeters).
The at least one physical dimension of is of known value may be within a certain range (for example—a Caucasian adult may have a height that ranges between 160 to 210 centimeters). Larger ranges may reduce the distance determination accuracy—but may be better than having no distance estimate at all.
An anchor may be determined in any manner—for example from a predefined list, based on metadata associated with a description of the anchor, and the like.
Non-limiting examples of anchors are traffic signs, different types of traffic light (types refer to different models, different number of lights, and the like), zebra crossings, road spacers, vehicles of a specific model, different types of pedestrians (child, adult, race), and the like.
There may be provide a system, method and a non-transitory computer readable medium that perform a calibration process or receive the outcome of the calibration process.
The calibration process involves using a camera and an active sensor such as a lidar.
This is followed by obtaining one or more images of a camera, and determining distance information based on the outcome of the calibration process and the appearance of one or more anchors in the one or more images.
Method 100 may start by step 110 of receiving information regarding one or more anchors. The information may include an identifier for identifying each object that serves as anchor and the at least one physical dimension of a known value associated with each anchor.
Step 110 may be followed by step 120.
Step 120 may include obtaining multiple calibration images by a second camera and acquiring distance information associated with the calibration images by a an active sensor such as a lidar.
The distance information may be lidar images or any other information regarding distances. The lidar images and the calibration images may be taken concurrently or at least before changing the distance between the camera and its environment.
The distance information is acquired while there is a known spatial relationship between the second camera and the lidar. The second camera and the lidar may be located at the same location, but this is not necessarily so.
The second camera is a two-dimensional camera and not a 3D camera.
The multiple calibration images capture the one or more anchors. Each calibration images may capture at least one of the one or more anchors. Assuming that there are multiple anchors—any of the multiple calibration images may include one, some or all of the multiple anchors. For example—one calibration image may include a first anchor, a second calibration image may include a second anchor, a third calibration image may include the first and second anchors, and the like.
At least some of the multiple calibration images may be acquired at different distances from the camera. Thus—one or more calibration images may be acquired at a same distance.
Step 120 may be followed by step 130 of detecting the one or more anchors within the multiple calibration images and obtaining a distance measurement (by the lidar) to the one or more anchors within the multiple calibration images.
Step 130 may include performing one or more distance measurements by an active sensor while utilizing a spatial relationship (aligned or at least with known mapping) between pixels of the images acquired by the active sensor and pixels of the one or more calibration images, to detect the anchor in the images acquired by the active sensor.
The lidar and the second camera can be aligned so that the field of view of the lidar and the second camera are the same.
In this case, once an anchor is detected within a calibration image (acquired by the second camera), its location within the lidar image is also known—and the distance measurement related to this anchor can be taken from the lidar image.
This alignment may eliminate the need to detect the anchor in the lidar image.
Step 130 may include performing one or more distance measurements by an active sensor, and searching the anchor in one or more images acquired by the active sensor and searching for the anchor, by applying an object detection algorithm, in the one or more calibration images.
The lidar and the second camera can be misaligned—but the mapping between pixels of the calibration images and the lidar images should be known—so that the location of the anchor in the lidar image can be deducted from the location of the anchor in the calibration image and the mapping.
This mapping may eliminate the need to detect the anchor in the lidar image.
According to another example—the second camera and the lidar may operate independently from each other—even without alignment of known mapping between pixels.
In this case the lidar images should be processed to detect the anchors within the lidar images.
This is followed by associating the distance information provided from the lidar images to the anchors in the calibration images.
Step 130 may be followed by step 140 of generating a distance-to-appearance relationship that maps appearances to distances.
The appearance of a dimension of a known value in an image may be the size of the dimension within the image—for example the number of pixels in an image that represent the dimension. For example—a traffic light of a known width appears in an image as a box of H×W pixels, so the appearance is W pixels.
The outcome of step 120 is multiple tuples of (appearance of an anchor having a dimension of known value, distance to the anchor), and the distance-to-appearance relationship may be generated during step 130 by any function capable of generating a mapping from multiple instances of tuples.
Method 200 may start by step 210 of obtaining, from a camera of a vehicle, an image of a surroundings of the vehicle.
The surrounding of the vehicle is any content within the field of view of the camera.
Step 210 may be followed by step 220 of searching, within the image, for an anchor, wherein the anchor is associated with at least one physical dimension of a known value.
Step 220 may be followed by step 230 of determining (when finding an anchor) a distance between the camera and the anchor based on, (a) the at least one physical dimension of a known value, (b) an appearance of the at least one physical dimension of a known value in the image, and (c) a distance-to-appearance relationship that maps appearances to distances.
The distance-to-appearance relationship may be generated by a calibration process that may include obtaining one or more calibration images of the anchor, and obtaining one or more distance measurements to the anchor.
Method 100 is an example of such as calibration process.
Method 200 may include method 100—for example as a preliminary step.
The one or more calibration images are multiple calibration images acquired at different distances from a second camera, and wherein the one or more distance measurements are indicative of the different distances. The executing of the calibration process may include calculating the distance-to-appearance relationship based on the appearances of the at least one physical dimension of a known value in the multiple calibration images and the different distances.
The one or more distance measurements may be executed by an active sensor, wherein the executing of the calibration process comprises searching the anchor in one or more images acquired by the active sensor and searching for the anchor, by applying an object detection algorithm, in the one or more calibration images.
The one or more distance measurements may be executed by an active sensor, wherein the executing of the calibration process comprises utilizing a spatial relationship between pixels of the images acquired by the active sensor and pixels of the one or more calibration images, to detect the anchor in the images acquired by the active sensor.
Step 220 may include approximating the anchor by a bounding box, and measuring at least one dimension of the bounding box to provide a value indicative of the appearance of the at least one physical dimension of the known value in the image.
An example of defining a bounding box is illustrated in U.S. patent application Ser. No. 16/544,940 filing date Aug. 20, 2019 which is incorporated herein by reference.
Assuming that the first and second images are acquired during the calibration process and at different distances (as measured by an active sensor) from the give away sign—these different distances and different appearances may be used for calculating the distance-to-appearance relationship.
Alternatively, assuming that the first and second images were acquired after the calibration process—then the appearance of the give away sign may provide an estimate of the distance of the give away sign from the vehicle at each moment.
It should be noted that if an image includes multiple anchors—then the distance to multiple points within the image may be calculated—based on the distances of these anchors, and their location in the image—for example by extrapolation. It should be noted that the latter may also be based on expected optical characteristics of the camera such as distortions.
The vehicle 90′ may also include camera 92, a processor 99, a vehicle controller 98, a memory unit 97, one or more vehicle computers—such autonomous driving controller or ADAS computer 96, and a communication unit 95 for communicating with other vehicles and/or a remote computer system such as a cloud computer.
The memory unit may store any data structure such as a distance to appearance relationship database, and the like.
The figure also illustrates a give way sign that has a certain width that appears as N3 pixels—indicating that it is at a distance of D3 from the camera—according to the distance to appearance relationship database 89.
While the foregoing written description of the invention enables one of ordinary skill to make and use what is considered presently to be the best mode thereof, those of ordinary skill will understand and appreciate the existence of variations, combinations, and equivalents of the specific embodiment, method, and examples herein. The invention should therefore not be limited by the above described embodiment, method, and examples, but by all embodiments and methods within the scope and spirit of the invention as claimed.
In the foregoing specification, the invention has been described with reference to specific examples of embodiments of the invention. It will, however, be evident that various modifications and changes may be made therein without departing from the broader spirit and scope of the invention as set forth in the appended claims.
Moreover, the terms “front,” “back,” “top,” “bottom,” “over,” “under” and the like in the description and in the claims, if any, are used for descriptive purposes and not necessarily for describing permanent relative positions. It is understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein.
Furthermore, the terms “assert” or “set” and “negate” (or “deassert” or “clear”) are used herein when referring to the rendering of a signal, status bit, or similar apparatus into its logically true or logically false state, respectively. If the logically true state is a logic level one, the logically false state is a logic level zero. And if the logically true state is a logic level zero, the logically false state is a logic level one.
Those skilled in the art will recognize that the boundaries between logic blocks are merely illustrative and that alternative embodiments may merge logic blocks or circuit elements or impose an alternate decomposition of functionality upon various logic blocks or circuit elements. Thus, it is to be understood that the architectures depicted herein are merely exemplary, and that in fact many other architectures may be implemented which achieve the same functionality.
Any arrangement of components to achieve the same functionality is effectively “associated” such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality may be seen as “associated with” each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being “operably connected,” or “operably coupled,” to each other to achieve the desired functionality.
Furthermore, those skilled in the art will recognize that boundaries between the above described operations merely illustrative. The multiple operations may be combined into a single operation, a single operation may be distributed in additional operations and operations may be executed at least partially overlapping in time. Moreover, alternative embodiments may include multiple instances of a particular operation, and the order of operations may be altered in various other embodiments.
Also for example, in one embodiment, the illustrated examples may be implemented as circuitry located on a single integrated circuit or within the same device. Alternatively, the examples may be implemented as any number of separate integrated circuits or separate devices interconnected with each other in a suitable manner
However, other modifications, variations and alternatives are also possible. The specifications and drawings are, accordingly, to be regarded in an illustrative rather than in a restrictive sense.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word ‘comprising’ does not exclude the presence of other elements or steps then those listed in a claim. Furthermore, the terms “a” or “an,” as used herein, are defined as one or more than one. Also, the use of introductory phrases such as “at least one” and “one or more” in the claims should not be construed to imply that the introduction of another claim element by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim element to inventions containing only one such element, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an.” The same holds true for the use of definite articles. Unless stated otherwise, terms such as “first” and “second” are used to arbitrarily distinguish between the elements such terms describe. Thus, these terms are not necessarily intended to indicate temporal or other prioritization of such elements. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to advantage.
While certain features of the invention have been illustrated and described herein, many modifications, substitutions, changes, and equivalents will now occur to those of ordinary skill in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
It is appreciated that various features of the embodiments of the disclosure which are, for clarity, described in the contexts of separate embodiments may also be provided in combination in a single embodiment. Conversely, various features of the embodiments of the disclosure which are, for brevity, described in the context of a single embodiment may also be provided separately or in any suitable sub-combination.
It will be appreciated by persons skilled in the art that the embodiments of the disclosure are not limited by what has been particularly shown and described hereinabove. Rather the scope of the embodiments of the disclosure is defined by the appended claims and equivalents thereof.
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| Number | Date | Country | |
|---|---|---|---|
| 20220114756 A1 | Apr 2022 | US |
| Number | Date | Country | |
|---|---|---|---|
| 63091303 | Oct 2020 | US |
