CN107343132B - Palm recognition device and method based on near-infrared LED light supplementing lamp - Google Patents
Palm recognition device and method based on near-infrared LED light supplementing lamp Download PDFInfo
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- CN107343132B CN107343132B CN201710751323.8A CN201710751323A CN107343132B CN 107343132 B CN107343132 B CN 107343132B CN 201710751323 A CN201710751323 A CN 201710751323A CN 107343132 B CN107343132 B CN 107343132B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/72—Combination of two or more compensation controls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention discloses a palm recognition device and method based on a near infrared LED light filling lamp, comprising the following steps: the system comprises a near infrared LED light supplementing lamp, a pulse power supply, a first control module and an image acquisition module supporting global exposure; the pulse power supply is used for providing pulse current for the near-infrared LED light supplementing lamp; the near-infrared LED light supplementing lamp is used for emitting first incident light with preset intensity to the palm; the first control module is in communication connection with the near infrared LED light supplementing lamp and the image acquisition module, and is used for controlling the image acquisition module to expose and the near infrared LED light supplementing lamp to be lightened by pulse current at the same time; the image acquisition module is used for receiving the reflected light reflected by the palm and converting the reflected light into a palm image. The technical problems that the palm image is difficult to identify and even cannot be identified due to overexposure, uneven brightness or glare of the palm image acquired by the existing palm identification device are solved.
Description
Technical Field
The invention relates to the technical field of safety certification, in particular to a palm recognition device and method based on a near infrared LED light supplementing lamp.
Background
In the technical field of security authentication, palm recognition is increasingly used based on the advantages of non-contact and easy use. In general, palm recognition is to use a near-infrared LED lamp to perform light filling, acquire an image of the palm through an image Sensor (CMOS Sensor), and then transmit the image to a processor at the rear end for processing and recognition comparison.
In the conventional palm image recognition device, the near infrared LED lamp is usually operated continuously, so that the output power of the near infrared LED lamp is limited in order to reduce the light attenuation effect and avoid the near infrared LED lamp from heating. Although some types of devices are added with human body sensing devices, the near infrared LED lamp can work intermittently or work with low power consumption with low brightness, as the CMOS Sensor adopts the Rolling router Rolling exposure principle to perform image capturing, the shortest working time of the near infrared LED lamp is usually more than 10 milliseconds or more, so that the near infrared LED lamp still cannot emit stronger infrared light.
When the palm image recognition device is used outdoors, the obtained palm image is subjected to overexposure, uneven brightness, glare and the like due to strong light interference of sunlight, so that the palm image is difficult to recognize and even cannot be recognized.
Disclosure of Invention
The invention provides a palm recognition device and method based on a near infrared LED light supplementing lamp, which solve the technical problems that the palm image is difficult or even impossible to recognize due to overexposure, uneven brightness or glare of the palm image obtained by the existing palm recognition device.
The invention provides a palm recognition device based on a near infrared LED light filling lamp, which comprises: the system comprises a near infrared LED light supplementing lamp, a pulse power supply, a first control module and an image acquisition module supporting global exposure;
the pulse power supply is used for providing pulse current for the near-infrared LED light supplementing lamp;
the near-infrared LED light supplementing lamp is used for emitting first incident light with preset intensity to the palm;
the first control module is in communication connection with the near infrared LED light supplementing lamp and the image acquisition module, and is used for controlling the image acquisition module to expose and the near infrared LED light supplementing lamp to be lightened by pulse current at the same time;
the image acquisition module is used for receiving the reflected light reflected by the palm and converting the reflected light into a palm image.
Preferably, the method comprises the steps of,
palm recognition device based on near-infrared LED light filling lamp still includes: the optical filter is arranged between the palm and the image acquisition module and is used for filtering the reflected light reflected by the palm so that the reflected light with preset wavelength passes through.
Preferably, the method comprises the steps of,
palm recognition device based on near-infrared LED light filling lamp still includes: and the second control module is connected with the near-infrared LED light supplementing lamp and is used for counting the lighting time of the near-infrared LED light supplementing lamp in the unit pulse period, and if the lighting time exceeds the first preset time, the near-infrared LED light supplementing lamp is turned off until the next pulse period starts.
Preferably, the method comprises the steps of,
the near infrared LED light supplementing lamps are at least one and are arranged in an array.
Preferably, the method comprises the steps of,
the palm recognition device based on the near infrared LED light supplementing lamp further comprises a display device and a processor in communication connection with the image acquisition module;
the processor is used for preprocessing the palm image output by the image acquisition module, and then comparing the preprocessed palm image with all preset images;
the display device is in communication connection with the processor and is used for displaying the comparison result of the processor.
Preferably, the method comprises the steps of,
the optical filter is a wide-narrow optical filter.
The invention provides a palm recognition method based on a near infrared LED light filling lamp, which comprises the following steps:
the method comprises the steps of controlling a near-infrared LED light supplementing lamp to emit first incident light with preset intensity to a palm through pulse current;
and the control exposure and the illumination of the near infrared LED light supplementing lamp are performed simultaneously by pulse current, and then reflected light reflected by the palm is received and converted into a palm image.
Preferably, the method comprises the steps of,
after receiving the reflected light reflected by the palm and converting the reflected light into a palm image, the method further comprises the following steps:
and filtering the reflected light reflected by the palm to enable the reflected light with the preset wavelength to pass through.
Preferably, the method comprises the steps of,
the reflected light reflected by the palm is received and converted into a palm image specifically comprises:
the reflected light reflected by the palm is received within 15cm from the palm and converted into a palm image.
Preferably, the method comprises the steps of,
when the pulse current is used for controlling the near-infrared LED light filling lamp to emit first incident light with preset intensity to the palm, the method further comprises the following steps:
and counting the lighting time of the near infrared LED light supplementing lamp in the unit pulse period, and if the lighting time exceeds the first preset time, turning off the near infrared LED light supplementing lamp until the next pulse period starts.
From the above technical scheme, the invention has the following advantages:
the near-infrared LED light supplementing lamp is controlled by pulse current to emit first incident light with preset intensity to the palm, and then the image acquisition module is controlled to be exposed and the near-infrared LED light supplementing lamp is lightened by the pulse current at the same time.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a palm recognition device based on a near-infrared LED light supplementing lamp according to an embodiment of the present invention;
fig. 2 is an application schematic diagram of a palm recognition device based on a near-infrared LED light supplementing lamp according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a first embodiment of a palm recognition method based on a near-infrared LED light-compensating lamp according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a second embodiment of a palm recognition method based on a near infrared LED light supplementing lamp according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a palm recognition device and a palm recognition method based on a near-infrared LED light supplementing lamp 2, wherein the near-infrared LED light supplementing lamp 2 is controlled to emit first incident light with preset intensity to a palm through pulse current, then the image acquisition module 3 is controlled to be exposed and the near-infrared LED light supplementing lamp 2 is controlled to be lightened simultaneously by the pulse current, because the image acquisition module 3 supports global exposure, the image acquisition module 3 can receive reflected light reflected by the palm at the moment that the near-infrared LED light supplementing lamp 2 is lightened by the pulse current and convert the reflected light into a palm image, compared with the palm image recognition device with the current rolling exposure, the palm recognition device in the invention allows the near-infrared LED light supplementing lamp 2 to work for a short time, so that the near-infrared LED light supplementing lamp 2 can emit infrared light with the intensity which is larger than the ambient light intensity in a short time under the condition of ensuring that the average power of the near-infrared LED light supplementing lamp 2 is very low, the ideal palm image can be acquired even under stronger ambient light, the palm image recognition is more beneficial, and the palm image recognition technology problem that the palm image is difficult to recognize even the palm image is difficult to recognize due to the fact that the palm image is too bright, uneven or the exposure image is obtained by the existing recognition device is solved.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a schematic structural diagram of a palm recognition device based on a near-infrared LED light compensating lamp 2 according to an embodiment of the present invention is shown;
referring to fig. 2, an application schematic diagram of a palm recognition device based on a near-infrared LED light compensating lamp 2 according to an embodiment of the present invention is provided;
the palm recognition device based on the near infrared LED light filling lamp 2 provided by the embodiment of the invention comprises: the system comprises a near infrared LED light supplementing lamp 2, a pulse power supply 1, a first control module 4 and an image acquisition module 3 supporting global exposure.
In this embodiment, the palm recognition device supplements light by using infrared LED light, and has better divergence than infrared laser light supplementing. When infrared laser light is used, the divergence of the infrared laser light is extremely small, and the infrared laser light is approximately 0.001 radian, so that the infrared laser light is required to be diverged and supplemented by a plano-concave lens. Therefore, compared with the infrared laser, the infrared LED light supplementing lamp is used for supplementing light, the effect is better, and the cost performance is improved.
The near-infrared LED light supplementing lamp 2 can select a near-infrared LED lamp with a plurality of operating wavelengths, for example, the operating wavelengths can be 810nm, 850nm and 940nm, the bandwidth is not more than 50nm, and the half power angle is not more than 60 degrees.
The near infrared LED light supplementing lamp 2 is used for emitting first incident light with preset intensity to the palm.
The preset intensity is determined by the magnitude of the pulse current, and in order to achieve a better palm image recognition effect, the intensity of the first incident light generally needs to be at least 2 times or more of the ambient light intensity, so that a proper pulse current can be correspondingly selected.
The pulse illumination time of the near infrared LED light filling lamp 2 is generally not more than 100us.
The pulse power supply 1 is used for providing pulse current for the near-infrared LED light supplementing lamp 2.
The first control module 4 may be a control circuit or a chip with a program written therein.
The first control module 4 is in communication connection with the near infrared LED light supplementing lamp 2 and the image acquisition module 3, and is used for controlling the image acquisition module 3 to expose and the near infrared LED light supplementing lamp 2 to be lightened simultaneously by pulse current.
Two methods are adopted for controlling the exposure of the image acquisition module 3 and the illumination of the near-infrared LED light supplementing lamp 2 by pulse current, wherein the first method is to only control the exposure time of the image acquisition module 3 and not adjust the on-off state of the near-infrared LED light supplementing lamp 2, and the second method is to set the exposure time of the image acquisition module 3 and control the on-off state of the near-infrared LED light supplementing lamp 2.
The image acquisition module 3 specifically comprises an image acquisition circuit, an optical lens 9 and an image acquisition device 8 supporting global exposure.
The image acquisition module 3 is used for receiving the reflected light reflected by the palm and converting the reflected light into a palm image.
It will be appreciated that the image acquisition module 3 may convert the emitted light into a palm image via photoelectric conversion, analog-to-digital conversion.
Further, the number of the near infrared LED light supplementing lamps 2 is at least one, and the near infrared LED light supplementing lamps are arranged in an array.
The array arrangement can achieve better light supplementing effect, and the instantaneous illumination intensity is improved.
In order to ensure a good light supplementing effect, the number of the near infrared LED light supplementing lamps 2 which are generally arranged in an array is not less than 50.
In addition, in another embodiment of the present invention, the palm recognition device based on the near infrared LED light filling lamp 2 may further include: and the optical filter 6 is arranged between the palm and the image acquisition module 3 and is used for filtering the reflected light reflected by the palm so that the reflected light with the preset wavelength passes through.
The optical filter 6 can enable only the ambient light with the same working wavelength as the first incident light to enter the image acquisition module 3 for imaging, so that the interference of the ambient light is greatly reduced.
Further, the filter 6 is a wide-narrow filter.
The central filter length of the wide and narrow optical filters can be 810nm, 850nm and 940nm corresponding to the working wavelength of the first incident light, the bandwidth is not more than 50nm, and the transmittance is not less than 50%; among them, a wide and narrow filter having a center filter length of 940nm is preferable.
In addition, in another embodiment of the present invention, the palm recognition device based on the near infrared LED light filling lamp 2 may further include: and the second control module 5 is connected with the near-infrared LED light supplementing lamp 2 and is used for counting the lighting time of the near-infrared LED light supplementing lamp 2 in the unit pulse period, and if the lighting time exceeds the first preset time, the near-infrared LED light supplementing lamp 2 is turned off until the next pulse period starts.
The second control module 5 may be a control circuit or a chip with a program written therein.
If the near infrared LED supplementary lighting lamp 2 is operated at a high power for a long time, damage due to overcurrent or overheat may be caused, so the second control module 5 may effectively protect the near infrared LED supplementary lighting lamp 2. Because the near-infrared LED light supplementing lamp 2 works under the pulse current, the working power of the near-infrared LED light supplementing lamp 2 in the pulse period is generally larger, so that the second control module 5 is important to the palm recognition device, the palm recognition device can be well ensured to work normally, and the service life of the palm recognition device is prolonged.
Considering the heat dissipation problem of the near infrared LED light supplementing lamp during high-power working, the first preset time can be set in the working environment of the palm recognition device, for example, the working environment temperature of the palm recognition device is higher, and the first preset time can be set to be shorter; if the palm recognition device works outdoors in winter, the first preset time can be set longer because the environment temperature is low and the heat dissipation is good.
In order to minimize the influence of the ambient light brightness on the image acquisition module 3 and to extend the life of the infrared LED light compensating lamp 2 as much as possible, the brightness of the infrared LED light compensating lamp 2 may be changed according to the change of the ambient brightness. When the ambient light brightness is strong, the illumination power of the infrared LED light supplementing lamp 2 is increased, so that the influence of the ambient light on the image is avoided; when the ambient light brightness is lower, the illumination power of the infrared LED light filling lamp 2 is reduced, and the service life of the infrared LED light filling lamp 2 is prolonged.
In addition, in another embodiment of the present invention, the palm recognition device based on the near infrared LED light filling lamp 2 may further include: a display device and a processor 7 in communication with the image acquisition module 3.
And the processor 7 is used for preprocessing the palm image output by the image acquisition module 3 and then comparing the preprocessed palm image with all preset images.
The display device and the image acquisition module 3 may be connected by wired communication or by wireless communication.
If the display device and the image acquisition module 3 are connected by wired communication, in order to receive the palm image converted by the image acquisition module 3, a processor 7 having multiple image interfaces such as DVP, CSI, MIPI, etc. is selected, and many interfaces of the processor 7 are not shown here.
The display device is in communication connection with the processor 7 and is used for displaying the comparison result of the processor 7.
The comparison result may be a preset image most similar to the palm image and a similarity index.
The above is a detailed description of the structure and connection manner of a palm recognition device based on the near-infrared LED light filling lamp 2, and for convenience of understanding, the following description will describe an application of the palm recognition device based on the near-infrared LED light filling lamp 2 in a specific application scenario, where an application example includes:
the palm is brought close to the image acquisition module 3 so that the distance of the palm from the image acquisition module 3 is within 15 cm. Then, the near-infrared LED light supplementing lamp 2 is controlled to be lightened by pulse current and emits first incident light to the palm, the image acquisition module 3 is controlled to expose while the light supplementing lamp is lightened, the image acquisition module 3 acquires reflected light which is reflected by the palm and filtered by the optical filter 6, and finally the reflected light is converted into a palm image, the palm image is output to the processor 7 for recognition, and a recognition result is displayed in the display device.
Referring to fig. 3, a flowchart of a first embodiment of a palm recognition method based on a near-infrared LED light-compensating lamp according to an embodiment of the present invention is shown;
the palm recognition method based on the near infrared LED light supplementing lamp provided by the embodiment of the invention comprises the following steps:
s101, controlling the near-infrared LED light supplementing lamp to emit first incident light with preset intensity to the palm through pulse current.
S102, controlling exposure and the near-infrared LED light supplementing lamp to be lightened by pulse current simultaneously, and then receiving reflected light reflected by the palm and converting the reflected light into a palm image.
The control process may be implemented by a control circuit or by a control program.
Referring to fig. 4, a flow chart of a second embodiment of a palm recognition method based on a near-infrared LED light-compensating lamp according to an embodiment of the present invention is shown;
the palm recognition method based on the near infrared LED light supplementing lamp provided by the embodiment of the invention comprises the following steps:
s201, the near-infrared LED light supplementing lamp is controlled by pulse current to emit first incident light with preset intensity to the palm.
S202, controlling exposure and the illumination of the near infrared LED light supplementing lamp by pulse current are performed simultaneously, filtering reflected light reflected by the palm, enabling reflected light with preset wavelength to pass through, and then receiving the filtered reflected light within 15cm from the palm and converting the filtered reflected light into a palm image.
The receiving distance is controlled within 15cm, so that the converted palm image can be ensured to have better brightness.
S203, counting the lighting time of the near infrared LED light supplementing lamp in the unit pulse period, and if the lighting time exceeds the first preset time, turning off the near infrared LED light supplementing lamp until the next pulse period starts.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. Palm recognition device based on near-infrared LED light filling lamp, characterized in that includes: the system comprises a near infrared LED light supplementing lamp, a pulse power supply, a first control module and an image acquisition module supporting global exposure;
the pulse power supply is used for providing pulse current for the near-infrared LED light supplementing lamp;
the near-infrared LED light supplementing lamp is used for emitting first incident light with preset intensity to the palm;
the first control module is in communication connection with the near infrared LED light supplementing lamp and the image acquisition module, and is used for controlling the image acquisition module to expose and the near infrared LED light supplementing lamp to be lightened by pulse current at the same time;
the image acquisition module is used for receiving the reflected light reflected by the palm and converting the reflected light into a palm image;
the palm recognition device further includes: the second control module is connected with the near-infrared LED light supplementing lamp and is used for counting the lighting time of the near-infrared LED light supplementing lamp in a unit pulse period, and if the lighting time exceeds a first preset time, the near-infrared LED light supplementing lamp is turned off until the next pulse period starts;
the first preset time is set according to the working environment of the palm recognition device;
the brightness of the near infrared LED light supplementing lamp is changed according to the change of the ambient brightness;
when the ambient light brightness is strong, the illumination power of the near infrared LED light supplementing lamp is increased, so that the influence of the ambient light on the image is avoided; when the ambient light brightness is lower, the illumination power of the near-infrared LED light supplementing lamp is reduced, and the service life of the near-infrared LED light supplementing lamp is prolonged.
2. The palm recognition device based on the near infrared LED light supplement lamp of claim 1, further comprising: the optical filter is arranged between the palm and the image acquisition module and is used for filtering the reflected light reflected by the palm so that the reflected light with preset wavelength passes through.
3. The palm recognition device based on the near infrared LED light supplement lamps according to claim 1, wherein at least one of the near infrared LED light supplement lamps is arranged in an array.
4. The palm recognition device based on the near infrared LED light supplement lamp of claim 1, further comprising a display device and a processor communicatively connected to the image acquisition module;
the processor is used for preprocessing the palm image output by the image acquisition module, and then comparing the preprocessed palm image with all preset images;
the display device is in communication connection with the processor and is used for displaying the comparison result of the processor.
5. The palm recognition method based on the near infrared LED light supplementing lamp is characterized by comprising the following steps of:
the method comprises the steps of controlling a near-infrared LED light supplementing lamp to emit first incident light with preset intensity to a palm through pulse current;
the control exposure and the illumination of the near infrared LED light supplementing lamp are performed simultaneously by pulse current, and then reflected light reflected by the palm is received and converted into a palm image;
when the pulse current is used for controlling the near-infrared LED light filling lamp to emit first incident light with preset intensity to the palm, the method further comprises the following steps:
counting the lighting time of the near infrared LED light supplementing lamp in a unit pulse period, and if the lighting time exceeds a first preset time, turning off the near infrared LED light supplementing lamp until the next pulse period starts;
the first preset time is set according to the working environment of the palm recognition device;
the brightness of the near infrared LED light supplementing lamp is changed according to the change of the ambient brightness;
when the ambient light brightness is strong, the illumination power of the near infrared LED light supplementing lamp is increased, so that the influence of the ambient light on the image is avoided; when the ambient light brightness is lower, the illumination power of the near-infrared LED light supplementing lamp is reduced, and the service life of the near-infrared LED light supplementing lamp is prolonged.
6. The palm recognition method based on the near infrared LED light supplement lamp of claim 5, wherein the receiving of the reflected light after the palm reflection and the conversion into the palm image further comprises:
and filtering the reflected light reflected by the palm to enable the reflected light with the preset wavelength to pass through.
7. The palm recognition method based on the near infrared LED light supplement lamp according to claim 5, wherein the receiving of the reflected light after the palm reflection and the conversion into the palm image are specifically:
the reflected light reflected by the palm is received within 15cm from the palm and converted into a palm image.
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| CN108737740A (en) * | 2018-07-10 | 2018-11-02 | 银河水滴科技（北京）有限公司 | A kind of image light compensation method and system |
| CN110493506B (en) * | 2018-12-12 | 2021-03-02 | 杭州海康威视数字技术股份有限公司 | Image processing method and system |
| CN117129191B (en) * | 2023-10-24 | 2024-02-06 | 徐州徐工汽车制造有限公司 | Infrared lamp fault diagnosis method, controller, camera system and storage medium |
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| CN202634841U (en) * | 2012-06-27 | 2012-12-26 | 中微光电子(潍坊)有限公司 | Light output self-compensation system based on LED (light-emitting diode) street lamp |
| CN104302065A (en) * | 2014-10-31 | 2015-01-21 | 浙江大学 | LED driver with automatic temperature regulating and compensating function |
| CN105163465A (en) * | 2015-10-12 | 2015-12-16 | 天津理工大学 | Large-power LED street lamp power supply circuit system and illumination power intelligent adjusting method |
| CN205040082U (en) * | 2015-10-26 | 2016-02-17 | 北斗航天卫星应用科技集团有限公司 | Street lamp and street lamp control system based on big dipper communication technology |
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