CN201709003U - Modulated-light filtering device based on infrared LED - Google Patents
Modulated-light filtering device based on infrared LED Download PDFInfo
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- CN201709003U CN201709003U CN201020252984XU CN201020252984U CN201709003U CN 201709003 U CN201709003 U CN 201709003U CN 201020252984X U CN201020252984X U CN 201020252984XU CN 201020252984 U CN201020252984 U CN 201020252984U CN 201709003 U CN201709003 U CN 201709003U
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Abstract
The utility model relates to a modulated-light filtering device based on an infrared LED, which comprises a controller, a camera, an image acquisition module, an image processing module, an infrared LED driving circuit and an infrared LED array, wherein the controller, the camera, the image acquisition module and the image processing module are connected through circuits, the infrared LED driving circuit is connected with the controller through the circuit, the infrared LED array is connected with the infrared LED driving circuit through the circuit, and a near-infrared light filtering piece is arranged on the camera. The utility model mainly realizes a modulated infrared LED light-supplementing light source, so that an infrared ray irradiated on a face is a flashing signal, the brightness signal difference of each pixel point is computed by comparing the brightness of two images in flashing bright and dark periods, a new image is generated, the sunlight part in the original image is filtered by the image, the purpose of eliminating the sunlight interference is achieved, and the performance of face recognition under outdoor sunlight is markedly improved.
Description
Technical field
The present invention relates to a kind of light modulated filtering apparatus, belong to technical field of biometric identification based on infrared LED.
Background technology
In general face identification system, in order to overcome the interference of daylight to recognition of face, generally used infrared LED as the light filling light source, launch the near infrared light of certain wavelength by the infrared LED of voltage stabilizing or constant-current driving,, be radiated at the people that is identified on the face as 850 nano wave lengths commonly used, the near infrared filter that cooperates centre wavelength 850 nanometers, filtering the most light except that centre wavelength, obtain to have the near-infrared image of certain light durability thus, discern for identification module.The shortcoming of this light filling filtering method is: what infrared LED was launched is the invariable near infrared light of wavelength and intensity, with the infrared ray stack in the daylight, owing to contain abundant infrared ray in the daylight, and its energy is far longer than the energy of infrared LED light filling, though can filtering most of visible light, the composition that contains daylight in the near-infrared image that is obtained inevitably, and along with the power of daylight changes, the variation of solar radiation angle, performance to recognition of face causes tangible influence, has limited recognition of face in outdoor application.
Present simulation camera generally all is a pal mode, output be an analog composite video signal, form by analog video signal, composite synchronizing signal, composite blanking signal.Analog video signal wherein is only real picture signal.
Composite synchronizing signal be the electron gun of control television set to electronic deflection, comprised line synchronizing signal and frame synchronizing signal, composite blanking signal is an emitting electrons not when image line feed and the flyback of carry over electron gun.Since the image seen of human eye during more than or equal to 24Hz the talent can not think image flicker, 25 width of cloth pictures are arranged promptly each second so the image of pal mode output is 25Hz, the specialty of saying point is exactly per second 25 frames, wherein each frame has 625 row.
Summary of the invention
A kind of light modulated filtering apparatus based on infrared LED provided by the invention has been eliminated daylight to the interference that recognition of face causes, and has improved the performance of recognition of face under outdoor daylight.
In order to achieve the above object, the invention provides a kind of light modulated filtering apparatus based on infrared LED, this device is applicable to the camera with outer synchronous input end, and this device comprises:
The controller, camera, image capture module, the image pretreatment module that connect of circuit successively;
This device also comprise circuit connect described controller the infrared LED drive circuit and, circuit connects the infrared LED array of described infrared LED drive circuit;
Described camera is provided with near infrared filter, the most of visible light of filtering;
Described controller comprises external synchronization signal generator and the frequency division shaping circuit that circuit connects;
External synchronization signal generator in the described controller produces the outer synchronous input end that an external synchronization signal outputs to camera, realizes synchronously as the frame frequency of camera;
Frequency division shaping circuit in the described controller reduces to 1/2 with the frequency of external synchronization signal, obtains switching pulse signal after shaping, and this switching pulse signal is outputed to the infrared LED drive circuit;
Described infrared LED drive circuit amplifies switching pulse signal, and the control infrared LED array is luminous, and when the high level of pulse, infrared LED is luminous; When the low level of pulse, infrared LED is not luminous;
Described infrared LED array comprises the infrared LED group of some groups of parallel connections, and each infrared LED group comprises infrared LED and current-limiting resistance of some series connection;
Described image capture module receives the analog video signal of camera output, and is converted to digital video signal and outputs to the image pretreatment module;
The luminance signal of adjacent two two field pictures that described image pretreatment module continuously will receive is done the difference computing, and difference signal is generated the new image of a width of cloth, and new image is input to face recognition module, finishes recognition of face.
The present invention also provides a kind of light modulated filtering apparatus based on infrared LED, and this device is applicable to the camera with outer synchronous input end, and this device comprises:
The camera, image capture module, the image pretreatment module that connect of circuit successively;
This device also comprise controller that circuit connects described camera, infrared LED drive circuit that circuit connects described controller and, circuit connects the infrared LED array of described infrared LED drive circuit;
Described camera is provided with near infrared filter, the most of visible light of filtering;
Described controller comprises frame synchronizing signal split circuit and the frequency division shaping circuit that circuit connects;
Frame synchronizing signal split circuit in the described controller is separated the frame synchronizing signal in the analog video signal of camera output, exports to the frequency division shaping circuit;
Frequency division shaping circuit in the described controller reduces to 1/2 with the frequency of frame synchronizing signal, obtains switching pulse signal after shaping, and this switching pulse signal is outputed to the infrared LED drive circuit;
Described infrared LED drive circuit amplifies switching pulse signal, and the control infrared LED array is luminous, and when the high level of pulse, infrared LED is luminous; When the low level of pulse, infrared LED is not luminous;
Described infrared LED array comprises the infrared LED group of some groups of parallel connections, and each infrared LED group comprises infrared LED and current-limiting resistance of some series connection;
Described image capture module receives the analog video signal of camera output, and is converted to digital video signal and outputs to the image pretreatment module;
The luminance signal of adjacent two two field pictures that described image pretreatment module continuously will receive is done the difference computing, and difference signal is generated the new image of a width of cloth, and new image is input to face recognition module, finishes recognition of face.
The present invention mainly realizes the infrared LED light filling light source through ovennodulation, make that being radiated at people's infrared ray on the face is a kind of flashing light, by the brightness of two width of cloth images during flash of light relatively bright and dark, the luminance signal that calculates each pixel is poor, generate the new image of a width of cloth, this image filtering the daylight part in the original image, reach and eliminate the purpose that daylight disturbs, significantly improved the performance of recognition of face under outdoor daylight.The present invention has solved the unclean problem of optical filtering that simple dependence optics can't thoroughly solve by the computing of the signal of telecommunication, is a kind of novel optoelectronic integration filtering method.
Description of drawings
Fig. 1 is the electrical block diagram of first kind of implementation of a kind of light modulated filtering apparatus based on infrared LED provided by the invention;
Fig. 2 is the electrical block diagram of second kind of implementation of a kind of light modulated filtering apparatus based on infrared LED provided by the invention.
Embodiment
Followingly specify better embodiment of the present invention according to Fig. 1～Fig. 2:
As shown in Figure 1, be a kind of light modulated filtering apparatus based on infrared LED, this device is applicable to the camera with outer synchronous input end, the frame frequency of this camera can be synchronous with the synchronizing signal of outside input, be particularly suitable for the occasion that between a lot of cameras, to switch, as the monitoring TV wall etc., because the frame frequency of each camera is synchronous, can not produce the scroll-up/down of image when switching, this device comprises:
The controller 101, camera 102, image capture module 103, the image pretreatment module 104 that connect of circuit successively;
This device also comprise circuit connect described controller 101 infrared LED drive circuit 106 and, circuit connects the infrared LED array 107 of described infrared LED drive circuit 106;
Described camera 102 is provided with near infrared filter 105, the most of visible light of filtering;
Described controller 101 comprises external synchronization signal generator and the frequency division shaping circuit that circuit connects;
External synchronization signal generator in the described controller 101 produces the outer synchronous input end that an external synchronization signal outputs to camera, realizes synchronously as the frame frequency of camera;
Frequency division shaping circuit in the described controller 101 reduces to 1/2 with the frequency of external synchronization signal, obtains switching pulse signal after shaping, and this switching pulse signal is outputed to infrared LED drive circuit 106;
Described infrared LED drive circuit 106 amplifies switching pulse signal, and control infrared LED array 107 is luminous, and when the high level of pulse, infrared LED is luminous; When the low level of pulse, infrared LED is not luminous;
In the present embodiment, described infrared LED array is made up of 40 infrared LEDs, goes here and there a current-limiting resistance after per 5 infrared LEDs series connection again, and then 8 connection in series-parallel;
Described image capture module 103 receives the analog video signal of cameras output, and is converted to digital video signal and outputs to image pretreatment module 104;
The luminance signal of adjacent two two field pictures that described image pretreatment module 104 continuously will receive is done the difference computing, and difference signal is generated the new image of a width of cloth, and new image is input to face recognition module, finishes recognition of face.
As shown in Figure 2, be the light modulated filtering apparatus of another kind based on infrared LED, this device is applicable to the camera with outer synchronous input end, practicality is stronger, can be used for any simulation camera, its frame frequency is synchronous between sensitive chip of camera inside (CMOS or CCD) and digital signal processing chip (DSP), and does not need camera to have outer synchronous input end, and this device comprises:
The camera 102, image capture module 103, the image pretreatment module 104 that connect of circuit successively;
This device also comprise controller 101, circuit that circuit connects described camera 102 connect described controller 101 infrared LED drive circuit 106 and, circuit connects the infrared LED array 107 of described infrared LED drive circuit 106;
Described camera 102 is provided with near infrared filter 105, the most of visible light of filtering;
Described controller 101 comprises frame synchronizing signal split circuit and the frequency division shaping circuit that circuit connects;
Frame synchronizing signal split circuit in the described controller 101 is separated the frame synchronizing signal in the analog video signal of camera 102 outputs, exports to the frequency division shaping circuit;
Frequency division shaping circuit in the described controller 101 reduces to 1/2 with the frequency of frame synchronizing signal, obtains switching pulse signal after shaping, and this switching pulse signal is outputed to infrared LED drive circuit 106;
Described infrared LED drive circuit 106 amplifies switching pulse signal, and control infrared LED array 107 is luminous, and when the high level of pulse, infrared LED is luminous; When the low level of pulse, infrared LED is not luminous;
In the present embodiment, described infrared LED array is made up of 40 infrared LEDs, goes here and there a current-limiting resistance after per 5 infrared LEDs series connection again, and then 8 connection in series-parallel;
Described image capture module 103 receives the analog video signal of cameras output, and is converted to digital video signal and outputs to image pretreatment module 104;
The luminance signal of adjacent two two field pictures that described image pretreatment module 104 continuously will receive is done the difference computing, and difference signal is generated the new image of a width of cloth, and new image is input to face recognition module, finishes recognition of face.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (4)
1. the light modulated filtering apparatus based on infrared LED is characterized in that this device is applicable to the camera with outer synchronous input end, and this device comprises:
The controller (101), camera (102), image capture module (103), the image pretreatment module (104) that connect of circuit successively;
This device also comprise circuit connect described controller (101) infrared LED drive circuit (106) and, circuit connects the infrared LED array (107) of described infrared LED drive circuit (106);
Described camera (102) is provided with near infrared filter (105);
Described controller (101) comprises external synchronization signal generator and the frequency division shaping circuit that circuit connects.
2. the light modulated filtering apparatus based on infrared LED as claimed in claim 1 is characterized in that described infrared LED array (107) comprises the infrared LED group of some groups of parallel connections, and each infrared LED group comprises infrared LED and current-limiting resistance of some series connection.
3. the light modulated filtering apparatus based on infrared LED is characterized in that this device is applicable to the camera with outer synchronous input end, and this device comprises:
The camera (102), image capture module (103), the image pretreatment module (104) that connect of circuit successively;
This device also comprise controller (101), circuit that circuit connects described camera (102) connect described controller (101) infrared LED drive circuit (106) and, circuit connects the infrared LED array (107) of described infrared LED drive circuit (106);
Described camera (102) is provided with near infrared filter (105), the most of visible light of filtering;
Described controller (101) comprises frame synchronizing signal split circuit and the frequency division shaping circuit that circuit connects.
4. the light modulated filtering apparatus based on infrared LED as claimed in claim 3 is characterized in that described infrared LED array (107) comprises the infrared LED group of some groups of parallel connections, and each infrared LED group comprises infrared LED and current-limiting resistance of some series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020252984XU CN201709003U (en) | 2010-07-06 | 2010-07-06 | Modulated-light filtering device based on infrared LED |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020252984XU CN201709003U (en) | 2010-07-06 | 2010-07-06 | Modulated-light filtering device based on infrared LED |
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| CN201709003U true CN201709003U (en) | 2011-01-12 |
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| CN201020252984XU Expired - Lifetime CN201709003U (en) | 2010-07-06 | 2010-07-06 | Modulated-light filtering device based on infrared LED |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452583A (en) * | 2016-08-29 | 2017-02-22 | 长春光客科技有限公司 | Device and method for parallel video transmission based on visible light |
| CN107333034A (en) * | 2017-06-12 | 2017-11-07 | 信利光电股份有限公司 | A kind of jamproof implementation method of infrared photography and realize device |
| CN111447372A (en) * | 2020-03-31 | 2020-07-24 | 浙江大华技术股份有限公司 | Control method, device, equipment and medium for brightness parameter adjustment |
-
2010
- 2010-07-06 CN CN201020252984XU patent/CN201709003U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452583A (en) * | 2016-08-29 | 2017-02-22 | 长春光客科技有限公司 | Device and method for parallel video transmission based on visible light |
| CN106452583B (en) * | 2016-08-29 | 2019-03-26 | 长春光客科技有限公司 | The device and method of visible light parallel transmission video |
| CN107333034A (en) * | 2017-06-12 | 2017-11-07 | 信利光电股份有限公司 | A kind of jamproof implementation method of infrared photography and realize device |
| CN111447372A (en) * | 2020-03-31 | 2020-07-24 | 浙江大华技术股份有限公司 | Control method, device, equipment and medium for brightness parameter adjustment |
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Granted publication date: 20110112 |