Patent Application
20200020671
The present invention relates to an image recognition auxiliary illumination technology, and in particular to a single-piece multi-frequency infrared light-emitting-diode (LED) and a multi-frequency high-precision object recognition system formed by using the same.
In general, light-emitting-diode (LED) is used to convert electricity directly into light, and having the advantages of compact size, low power consumption, long service life, non-toxic, and environment protection. Therefore, LED can be used extensively in various applications, such as pilot light, billboard, backlight of liquid crystal display (LCD), and ordinary illumination. Usually, light-emitting-diode (LED) can be classified into visible light LED (wavelength 450 nm to 680 nm) and invisible light LED (wavelength 850 nm to 1550 nm). In the early stage, the LEDs utilized are mostly single-color LEDs.
Along with the rapid progress and development of science and technology, presently, for the visible light LED, various light emitting dies can be packaged and integrated to form a single-piece multi-color LED. The color combination can be achieved through switching of conduction, to fulfill the actual illumination requirements of various applications.
With regards to the invisible light infrared LED (IR LED), it may have various different applications depending on wavelength of light it emits, as explained as follows:
For wavelength of 940 nm: suitable to use for remote controller, such as a remote controller for a household electric appliance.
For wavelength of 808 nm: suitable to use for medical instruments, space light communication, and infrared illumination.
For wavelength of 830 nm: suitable to use for an automatic card system on super highway. In application, the effect of a little red light is better than that of using LED of wavelength 850 nm.
For wavelength of 850 nm: suitable to use for video monitoring, big building intercom, and anti-burglar alarm.
For wavelength of 870 nm: suitable to use for supermarket, camera at crossroad.
Though the invisible light infrared LED has found increasing applications in various fields, yet from its early stage utilized in remote controller and monitor, to the present stage of utilized in the intelligent handset and touch-control panel, its structure does not show marked variations for several decades; while in manufacturing, it still maintains as a single piece LED producing invisible light of single frequency.
The reason for this can be attributed to an important fact that, for a long time, the invisible light infrared LED is used as light source for the remote controller or image monitor. As such, in application, it has to work in cooperation with infrared sensor receiver or image sensor. Thus, the design requirement is that, the related transmission frequency and the receiving frequency must be chosen correctly; otherwise, the subsequent receiving effects could be adversely affected, or it may even not able to perform the normal functions.
In designing the system, the actual requirements of light emission, light reflection, light receiving, pairing-up of devices involved must be taken into consideration. Though in more advanced design, the infrared LED and the infrared sensor receiver can be integrated into as a single piece, to reduce its size and save the space occupied, yet the invisible light infrared LED utilized in this structure is only able to emit light of a single frequency.
In conclusion, due to the technical limitations and bottlenecks, the present technology is only able to produce a single-piece, single-frequency LED capable of emitting invisible lights. In case despite the technology difficulties involved, a plurality of infrared dies are put together to form a single-piece multi-frequency infrared LED. For example, two infrared dies of different wavelengths of 850 nm and 940 nm are put together to form a single-piece double-frequency infrared light-emitting-diode (LED). In this case, the manufacturing process tends to become tedious and cumbersome, while its cost is high. In particular, when the single-piece double-frequency infrared light-emitting-diode (LED) is put on an electric-circuit-board, once the transmitting and receiving wavelengths of an infrared die are chosen and set to be 850 nm (or 940 nm), the other infrared dies of 940 nm (or 850 nm) are lying idle and is wasted.
Therefore, the design and performance of a conventional infrared light-emitting-diode (LED) are not quite satisfactory, and it leaves much room for improvements.
In view of the problems and drawbacks mentioned above, the present invention provides a single-piece multi-frequency infrared light-emitting-diode (LED), to overcome the shortcomings of the Prior Art, to achieve the requirements of precision, low cost, and miniaturization, for image recognition.
The present invention provides a single-piece multi-frequency infrared light-emitting-diode (LED) comprising: a carrier; an electrical circuit board, enclosed by the carrier; a plurality of light-emitting-diodes (LEDs), disposed on the electric circuit board, and are spaced apart from each other; a plurality of metal pins, disposed corresponding to and are connected electrically with the plurality of light-emitting-diodes (LEDs) respectively, and are extended outside the carrier in protrusion; and a light emitting port, located on an upper portion of the carrier, and corresponds to the plurality of light-emitting-diodes (LEDs), and it is characterized as follows.
The plurality of light-emitting-diodes (LEDs) on the electrical circuit board all emit infrared lights, and the plurality of light-emitting-diodes (LEDs) each includes a first infrared light-emitting-die and a second infrared light-emitting-die, and the lights emitted are both between wavelength 850 nm and 1050 nm and are spaced apart.
In addition, the present invention further provides a multi-frequency high-precision object recognition system, comprising: at least a multi-frequency light-emitted-unit, a multi-frequency image sensor unit, and an image calculation processing unit. Wherein the multi-frequency light-emitted-unit emits lights of different wavelengths onto an object-to-be-tested, the multi-frequency image sensor unit senses and fetches images of the lights of different wavelengths reflected by the object-to-be-tested, and transmits the images to the image calculation processing unit, and it is characterized as follows.
The at least a multi-frequency light-emitted-unit is formed by a single-piece multi-frequency infrared light-emitting-diode (LED), and lights emitted includes at least two infrared lights, having their wavelengths each between 850 nm and 1050 nm and spaced apart.
The multi-frequency image sensor unit senses and fetches at least two reflected infrared lights of narrow range image signal, having their wavelengths between 850 nm and 1050 nm and are spaced apart, and their wavelength widths between 10 nm and 60 nm.
The image calculation processing unit is adapted to dispose a single-piece planar image in its X axis and its Y axis, the lights of different wavelengths in a Z axis indicate image depth, wherein sample wavelength in the Z axis includes at least two infrared narrow range image signals having their wavelengths between 850 nm and 1050 nm and are spaced apart, and corresponding to that of the multi-frequency image sensor unit, and their wavelength widths are between 10 nm and 60 nm, then calculate to obtain a plurality of single-piece planar images in the X axis and the Y axis as sampled by different wavelength widths in the Z axis, superimpose the plurality of single-piece planar images to form a 3-dimension stereoscopic relief image for precise comparison and recognition.
Due to the much improved recognition effect of the multi-frequency high-precision object recognition system over the conventional technology, it is indeed a breakthrough for the application of the infrared LED. In the early stage of developing the present invention, two single-piece infrared LEDs of different wavelengths 850 nm and 940 nm are utilized, However, since in this approach, the light emitting angle could affect the clearness of the image produced by the subsequent light reflections and receiving. So, the image thus obtained has to go through repeated corrections and adjusting, thus it is rather tedious and time consuming. Yet, the assembled device has to occupy the space of two infrared LEDs. Thus, this approach is not able to meet the high-tech image recognition requirements of precision, low cost, and miniaturization.
Therefore, the present invention adopts a new approach to produce a single-piece multi-frequency infrared light-emitting-diode (LED), to overcome the problems mentioned above. As such, the assembly and production of the multi-frequency high-precision object recognition system is able to meet the requirement of stability, fast speed, precision, low cost, and miniaturization. For this reason, the present invention can be utilized extensively in the various applications of security monitoring, industrial monitoring, face recognition, vehicle door open through image recognition. In particular, when the recognition system is used in an intelligent mobile device, it requires less components to function, to save cost and space significantly. In addition, in application, it is able to fetch 3-dimension stereoscopic relief images precisely at high speed, without being affected by the variations of the ambient lights. Therefore, the major advantage of the present invention is that, it is able to raise the precision of human face recognition.
Further scope of the applicability of the present invention will become apparent from the detailed descriptions given hereinafter. However, it should be understood that the detailed descriptions and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from the detail descriptions.
The related drawings in connection with the detailed descriptions of the present invention to be made later are described briefly as follows, in which:
The purpose, construction, features, functions and advantages of the present invention can be appreciated and understood more thoroughly through the following detailed descriptions with reference to the attached drawings.
Refer to
As shown in
The plurality of light-emitting-diodes (LEDs) 3 on the electrical circuit board 2 all emit infrared light, and the plurality of light-emitting-diodes (LEDs) 3 each includes a first infrared light-emitting-die 31 and a second infrared light-emitting-die 32, and the lights emitted are both between wavelength 850 nm and 1050 nm and are spaced apart.
The light emitting port 11 is of a cone shape, lights emitted by the first infrared light-emitting-die 31 and the second infrared light-emitting-die 32 are of wavelengths selected from two of the following: 850 nm, 940 nm, and 1050 nm.
A total of two infrared light-emitting-dies 31, 32 are provided on the electrical circuit board 2. The electrical circuit board 2 is cross-divided into four copper separation regions 22, and two die fixing parts 23 are disposed respectively on the two copper adjacent separation regions 22 adjacent to each other. The first infrared light-emitting-die 31 emits light of wavelength 850 nm, the second infrared light-emitting-die 32 emits light of wavelength 940 nm.
Refer to
The at least a multi-frequency light-emitted-unit 101 is formed by a single-piece multi-frequency infrared light-emitting-diode (LED) 1, and the lights emitted includes at least two infrared lights, having their wavelengths each between 850 nm and 1050 nm and spaced apart. The light emitted by the first infrared light-emitting-die 31 is of wavelength 850 nm, and the light emitted by the second infrared light-emitting-die 32 is of wavelength 940 nm.
The multi-frequency image sensor unit 102 senses and fetches at least two reflected infrared lights of narrow range image signals 301 and 302, having their wavelengths between 850 nm and 940 nm and are spaced apart, and having their wavelength widths between 10 nm and 60 nm.
The image calculation processing unit 103 is adapted to dispose a single-piece planar image 91 in its X axis and its Y axis, the lights of different wavelengths in a Z axis indicate an image depth. Wherein, sample wavelength in the Z axis includes at least two infrared narrow range image signals 301, 302 having their wavelengths between 850 nm and 940 nm and spaced apart and corresponding to that of the multi-frequency image sensor unit 102, and their wavelength widths are between 10 nm and 60 nm. Then, calculate to obtain a plurality of single-piece planar images 91 in the X axis and the Y axis as sampled by different wavelength widths in the Z axis. Then, superimpose the plurality of single-piece planar images 91 into a 3-dimension stereoscopic relief image 95 for precise comparison and recognition.
Then, refer to
In the present invention, in order to achieve better recognition, the image signal formed by superimposing the wide range image signal 305 and at least two narrow range image signals 301, 302 is used, to realize clearness of layers and to give a sense of depth and layer. And this can be used to calculate precisely the 3-dimension characteristics of the object-to-be-tested 90, such as distance of depth, hand gesture, getting around an obstacle, etc. That is quite important for 3-dimension image depth and distance measurement applications, such as Virtual Reality/Augmented Reality (VR/AR), drone, people/things counting. Further, it is capable of performing depth measurements for object-to-be-tested 90 and its surroundings. As such, the technology of the present invention can also be used in the fields of Artificial Intelligence (AI), and Computer Vision. For example, the recognition system 100 can be installed in a vehicle (not shown), and is used for face recognition door opening for an automobile, or fatigue detection for a motor cyclist, but the present invention is not limited to this.
In the descriptions above, the object-to-be-tested 90 can be a human face, and that is used quite often in face recognition turn-on of a mobile device, or face recognition turn-on of an automatic payment device. The multi-frequency high-precision object recognition system of the present invention can be put on an intelligent mobile device, such as an intelligent handset or a tablet, etc., yet the present invention is not limited to this. The recognition system 100 may also be put on a desk top computer or a notebook computer.
Refer to
Moreover, as shown in
In the descriptions above, only one infrared light-emitting-die is added, however, the present invention is not limited to this. In fact, the amount of infrared light-emitting-die added can be classified into various grades corresponding to different recognition precisions. As such, it can be customized to use extensively in various applications, such as security monitoring, industrial monitoring, face recognition, webcam, drone, robot, and vehicle backup auxiliary image fetching.
The above detailed description of the preferred embodiment is intended to describe more clearly the characteristics and spirit of the present invention. However, the preferred embodiments disclosed above are not intended to be any restrictions to the scope of the present invention. Conversely, its purpose is to include the various changes and equivalent arrangements which are within the scope of the appended claims.
