Device and method for supplementing modulated light for face recognition

A face recognition and modulated light technology, applied in the field of biometrics, can solve the problems of face recognition performance impact, fixed, unsatisfactory images, etc., and achieve the effect of improving face recognition performance, improving performance, and reliable performance.

Inactive Publication Date: 2010-12-15
上海洪剑智能科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] After adding infrared LEDs and infrared filters, although the performance of face recognition has improved, the illuminance of infrared LEDs driven by regulated voltage or constant current is fixed, and a constant illuminance can be used to cope with very large environments. The dynamic range of the light still cannot get a satisfactory image, which has a significant impact on the performance of face recognition

Method used

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  • Device and method for supplementing modulated light for face recognition
  • Device and method for supplementing modulated light for face recognition
  • Device and method for supplementing modulated light for face recognition

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Embodiment approach

[0039] Such as figure 1 As shown, it is a modulated light supplementary light device for face recognition, which includes:

[0040] A light sensor 101, a voltage dividing resistor 102, a control circuit 103, an infrared LED drive circuit 104 and an infrared LED array 105 connected in sequence;

[0041] The light sensor 101 and the voltage dividing resistor 102 are connected in series to form a resistance voltage dividing circuit;

[0042] The modulated light supplementary light device also includes a voltage stabilizing circuit 106, a crystal oscillator circuit 107, and a reset circuit 108 respectively circuit-connected to the control circuit 103;

[0043] The photosensor 101 can be selected from photodiode, phototransistor, photoresistor, infrared sensor, ultraviolet sensor, fiber optic photosensor, color sensor, CCD (charge coupled device) and CMOS (complementary metal oxide semiconductor) image sensor, etc.;

[0044] The present invention selects the simplest photosensor ...

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Abstract

The invention relates to a device and a method for supplementing modulated light for face recognition. The device comprises a photo sensor, a voltage-dividing resistor, a control circuit, an infrared light-emitting diode (LED) driving circuit, an infrared LED array, a voltage-stabilizing circuit, a crystal oscillating circuit and a reset circuit, wherein the photo sensor, the voltage-dividing resistor, the control circuit, the infrared LED driving circuit and the infrared LED array are electrically connected in turn; and the voltage-stabilizing circuit, the crystal oscillating circuit and the reset circuit are electrically connected with the control circuit respectively. The photo sensor detects the intensity of outdoor visible ambient light and the control circuit output pulse-width modulation pulses to control the infrared LED array, so that the infrared LED array emits infrared light having corresponding light intensity to that of the outdoor visible ambient light, a better light supplementing effect is achieved and face recognition performance is further improved.

Description

technical field [0001] The invention relates to a modulated light supplementary light device and a supplementary light method for face recognition, belonging to the technical field of biometric identification. Background technique [0002] Face recognition access control must work normally day and night, and the dynamic range of light during day and night is very large. The ambient illuminance in summer sunlight can reach 50,000Lux-120,000Lux, and it is only 0.1Lux when street lights are on at night, and about 0.00035Lux in starry night. The comparison is 500,000 times to 300 million times. Ordinary cameras only have a dynamic range of 3:1, and wide dynamic cameras reach about 100:1. In this case, it is impossible for the camera used for face recognition to adapt to such a situation no matter whether it has the function of automatically adjusting the exposure or the electronic shutter of the camera itself. Wide illuminance range, it is impossible to achieve the effect of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 唐坚朱学曦
Owner 上海洪剑智能科技有限公司
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