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Modulated light filtering device for face recognition and filtering method

A technology of face recognition and light filtering device, which is applied in the field of biometrics, can solve problems such as limiting face recognition applications and affecting face recognition performance, and achieve the effects of eliminating interference, eliminating sunlight interference, and improving performance

Active Publication Date: 2010-12-29
SHANGHAI KANKAN INTELLIGENT TECH CO LTD
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Problems solved by technology

The disadvantage of this supplementary light filtering method is that the infrared LED emits near-infrared light with constant wavelength and intensity, which is superimposed with the infrared rays in sunlight. Since sunlight is rich in infrared rays, and its energy is much greater than that of infrared LEDs Although the energy of supplementary light can filter out most of the visible light, the obtained near-infrared image inevitably contains sunlight components, and with the change of the intensity of sunlight and the change of the angle of sunlight, it will affect the performance of face recognition. Obvious impact, which limits the application of face recognition outdoors

Method used

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  • Modulated light filtering device for face recognition and filtering method
  • Modulated light filtering device for face recognition and filtering method
  • Modulated light filtering device for face recognition and filtering method

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Embodiment approach

[0065] Such as figure 1 As shown, it is a modulated light filter device for face recognition. This device is suitable for cameras with external synchronization input terminals. In the case of switching between cameras, such as monitoring a video wall, etc., since the frame rate of each camera is synchronized, there will be no image scrolling up and down during switching. The device includes:

[0066] A controller 101, a camera 102, an image acquisition module 103, and an image preprocessing module 104 connected in sequence;

[0067] The device also includes an infrared LED drive circuit 106 circuit connected to the controller 101, and an infrared LED array 107 circuit connected to the infrared LED drive circuit 106;

[0068] The camera 102 is provided with a near-infrared filter 105 to filter out most of the visible light;

[0069] Described controller 101 comprises the external synchronous signal generator and the frequency division shaping circuit of circuit connection;

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Abstract

The invention provides a modulated light filtering device for face recognition and a filtering method. The device comprises a controller, a camera, an image acquisition module and an image preprocessing module which are electrically connected, an infrared LED drive circuit electrically connected with the controller and an infrared LED array electrically connected with the infrared LED drive circuit. Near infrared filters are arranged on a camera. Through the modulated infrared LED light supplementary source, infrared ray irradiating on the face is a flashing signal, the luminance signal difference of each pixel point is calculated by comparing the brightness of two images in the bright and dark periods of flashing, and a new image is then produced. The sunlight part in the original image is filtered in the new image. The aim of eliminating the sunlight interference is fulfilled and the performance of face recognition in the outdoor sun is remarkably improved.

Description

technical field [0001] The invention relates to a modulated light filter device and a filter method for face recognition, belonging to the technical field of biological recognition. Background technique [0002] In general face recognition systems, in order to overcome the interference of sunlight on face recognition, infrared LEDs are generally used as supplementary light sources, and infrared LEDs driven by constant voltage or constant current emit near-infrared light of a certain wavelength, such as commonly used The wavelength of 850 nanometers is irradiated on the recognized face, and with the near-infrared filter with a central wavelength of 850 nanometers, most of the light except the central wavelength is filtered out, thereby obtaining a near-infrared image with a certain light stability , for the identification module to identify. The disadvantage of this supplementary light filtering method is that the infrared LED emits near-infrared light with constant waveleng...

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Application Information

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IPC IPC(8): H04N5/235H04N5/232G03B11/04G03B15/05G03B30/00
Inventor 唐坚朱学曦
Owner SHANGHAI KANKAN INTELLIGENT TECH CO LTD
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