CN101917795A - Device and method for supplementing modulated light for face recognition - Google Patents
Device and method for supplementing modulated light for face recognition Download PDFInfo
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- CN101917795A CN101917795A CN2010102208985A CN201010220898A CN101917795A CN 101917795 A CN101917795 A CN 101917795A CN 2010102208985 A CN2010102208985 A CN 2010102208985A CN 201010220898 A CN201010220898 A CN 201010220898A CN 101917795 A CN101917795 A CN 101917795A
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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
The present invention relates to light modulated light compensating apparatus and light compensation method that a kind of recognition of face is used, belong to technical field of biometric identification.
Background technology
The recognition of face gate inhibition must day and night can both operate as normal, and daytime and night light the dynamic change scope very big, ambient light illumination reaches 50000Lux-120000Lux under the summer sunlight, only be 0.1Lux night during street lamp, starlight is about 0.00035Lux at night.Contrast is 500,000 times to 300,000,000 times.Common camera only has 3: 1 dynamic ranges, wide dynamic camera reaches about 100: 1, no matter whether have automatic adjustment exposure function as the camera of recognition of face in this case or the electronic shutter by camera itself can not adapt to so wide illumination range, also just can't reach the effect of controlling image effect.
In general face identification system, in order to overcome daylight to the interference of recognition of face and the lighting problem in the solution dark surrounds, generally used infrared LED (light-emitting diode) as active light filling light source, infrared LED emission near infrared light by voltage stabilizing or constant-current driving, be radiated at the people that is identified on the face, cooperate near infrared filter, obtain to have the near-infrared image of certain light durability, discern for face recognition module with this.
After having added infrared LED and infrared filter, though the recognition of face performance makes moderate progress, but the illuminance of the infrared LED of voltage stabilizing or constant-current driving is changeless, deal with the dynamic range of very large ambient light with a kind of constant illuminance, still can not obtain satisfied image, the performance of recognition of face is caused tangible influence.
Summary of the invention
Light modulated light compensating apparatus and light compensation method that a kind of recognition of face provided by the invention is used, use the pulse-width modulation driving power to come to power to infrared LED, can regulate the brightness of infrared LED according to ambient light illumination automatically, make that being radiated at people's near-infrared illumination and ambient light illumination on the face reaches certain forward proportionate relationship, remedy the illumination contrast problem of ambient lighting and infrared LED to a certain extent, improved the recognition of face performance.
In order to achieve the above object, the invention provides the light modulated light compensating apparatus that a kind of recognition of face is used, comprise:
The optical sensor, divider resistance, control circuit, infrared LED drive circuit and the infrared LED array that connect of circuit successively;
Optical sensor and divider resistance are composed in series resistor voltage divider circuit;
This light modulated light compensating apparatus also comprises voltage stabilizing circuit, crystal oscillating circuit and the reset circuit that circuit respectively connects described control circuit;
Described optical sensor is gathered visible ambient light, is converted to corresponding analog quantity resistance value;
The analog quantity resistance value that described resistor voltage divider circuit is exported optical sensor by the mode of electric resistance partial pressure is converted to analog voltage;
Control circuit of the present invention carries out the A/D conversion, calculates the high level duty ratio, exports the time scale that pwm pulse signal is controlled the infrared LED on and off in the infrared LED array, thereby adjusts the infrared light intensity of output;
Described infrared LED drive circuit after the pwm pulse signal amplification, drives infrared LED array under the control of control circuit;
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; During work, the electric current that each infrared LED flows through is determined according to selected infrared LED rated current, makes selected infrared LED reach rated working current value by regulating current-limiting resistance;
Described voltage stabilizing circuit provides stable voltage to power to control circuit and other components and parts;
Described crystal oscillating circuit provides clock pulse for control circuit;
Described reset circuit can restart in when debugging or fault light modulated light filling in season.
The light modulated light compensation method that the present invention also provides a kind of recognition of face to use comprises following steps:
Step 4, control circuit calculate high level duty ratio Pn, jump to step 5;
Pn＝((P1-P0)/(V1-V0))*(Vn-V0)+P0；
Wherein, obtain digital quantity magnitude of voltage V1 and duty ratio P1 under the sunburst environment by step 4.1; Obtain digital quantity magnitude of voltage V0 and duty ratio P0 under the dark surrounds by step 4.2;
Step 4.1, under sunburst, through the optical sensor collection, and be V1, establish duty ratio P1=1 through the magnitude of voltage of A/D conversion;
Step 4.2, under dark surrounds, gather through optical sensor 101, and the magnitude of voltage of changing through A/D is V0, progressively increase duty ratio since 0, the infrared light that led array sends also progressively increases, when adjusting to duty ratio P0, the facial image brightness that makes camera take can reach the requirement of recognition of face, (decision method of specific requirement is: the image of the some that obtains is carried out recognition of face, according to the result of face identification method to the detection of people's face, if detect mortality, just judge the requirement that can reach recognition of face less than one thousandth) thus duty ratio P0 under the dark surrounds obtained;
Step 5, control circuit output duty cycle are that the pwm pulse signal of Pn is given the infrared LED drive circuit;
Step 6, infrared LED drive circuit are exported to infrared LED array after pwm pulse signal is amplified;
Step 6.1, regulate the current-limiting resistance of series connection, determine the operating current of every group of LED according to the infrared LED characteristic;
Step 6.2, determine the group number of LED according to the picture quality behind the light filling under the sunburst;
Concrete steps are: keep infrared LED Chang Liang, progressively increase infrared LED and the joint group number, can effectively get rid of the interference that sunlight causes up to making in the facial image that camera is taken, obtain desirable image;
The interference that sunlight causes recognition of face, mainly contain the shade that sunlight direct projection from top to bottom causes on the face the people, as the black face problem of the shade of below, outstanding position such as nose, eyebrow, sunlight facial image from the left side or when the negative and positive face problem that causes on the face the people of right side oblique fire and backlight, all be interference to recognition of face.Progressively increase group number in parallel during debugging, make infrared light that the whole LED array sends along with and the increase of joint group number progressively strengthen, infrared light just increases with respect to the ratio of sunlight, when this ratio increases to a certain degree, shade, negative and positive face and black face just are illuminated, the picture quality that obtains is just high, the concrete method of judging is: the image of the some that obtains is carried out recognition of face, according to the result of face identification method to the detection of people's face, if detect mortality less than one thousandth, just can judge effective interference of getting rid of sunlight;
Step 7, infrared LED array send the infrared light through the PWM modulation, jump to step 1;
Wherein, step 4.1,4.2,6.1,6.2 debug phases before light compensating apparatus moves for the first time carry out, and the circulation execution in step 1,2,3,4,5,6,7 during the light compensating apparatus operate as normal.
The present invention is by the intensity of the outdoor visible ambient light of light sensors, then by control circuit output PWM (pulse-width modulation) pulse control infrared LED array, infrared LED array is sent and the corresponding infrared light of outdoor environment luminous intensity, reach better light filling effect, thereby further improve the performance of recognition of face, function of the present invention is strong, dependable performance, circuit is simple, cost is low, intelligent level is high.
Description of drawings
Fig. 1 is the electrical block diagram of the light modulated light compensating apparatus used of a kind of recognition of face provided by the invention;
Fig. 2 is the flow chart of the light modulated light compensation method used of a kind of recognition of face provided by the invention.
Embodiment
Following according to Fig. 1 and Fig. 2, specify better embodiment of the present invention:
As shown in Figure 1, be the light modulated light compensating apparatus that a kind of recognition of face is used, this device comprises:
The optical sensor 101, divider resistance 102, control circuit 103, infrared LED drive circuit 104 and the infrared LED array 105 that connect of circuit successively;
Optical sensor 101 is composed in series resistor voltage divider circuit with divider resistance 102;
This light modulated light compensating apparatus also comprises voltage stabilizing circuit 106, crystal oscillating circuit 107 and the reset circuit 108 that circuit respectively connects described control circuit 103;
Described optical sensor 101 optional photodiode, phototransistor, photo resistance, infrared ray sensor, UV sensor, optical fiber type photoelectric transducer, color sensor, CCD (charge coupled device) and CMOS (complementary metal oxide semiconductors (CMOS)) imageing sensors etc. used;
The present invention selects the simplest optical sensor photo resistance for use, and the output characteristic of photo resistance is the output of linear analogue amount resistance;
Visible ambient light is gathered in described photo resistance, is converted to corresponding analog quantity resistance value;
The analog quantity resistance value that described resistor voltage divider circuit is exported optical sensor by the mode of electric resistance partial pressure is converted to analog voltage;
Control circuit 103 of the present invention is selected single chip circuit for use, carries out the time scale that the infrared LED on and off in the infrared LED array are controlled in A/D conversion, computed duty cycle, output pwm pulse signal, thereby adjusts the infrared light intensity of output;
Adopted single-chip microcomputer output pwm pulse to control the mode of infrared LED in the present invention, when the high level of pulse, infrared LED is luminous, when the low level of pulse, infrared LED is not luminous, when the frequency of pulse during greater than 100KHz, with respect to the shutter of video camera, the frequency of pulse is very high, in the exposure cycle of piece image, the signal period that has comprised a plurality of pulses, its pulse high level duty ratio is big more, and the luminous time is long more, and the infrared light mean flow rate of accumulation is strong more, otherwise, the pulse high level duty ratio is more little, and the luminous time is short more, and the infrared light mean flow rate of accumulation is weak more, exposure in piece image is to be equivalent to infrared LED always luminous, and its mean flow rate is subjected to the control of pulse duty factor;
Described infrared LED drive circuit 104 after the pwm pulse signal amplification, drives infrared LED array under the control of control circuit 103;
Described infrared LED array 105 is composed in parallel by some string infrared LEDs, the current-limiting resistance of contacting again after per 5 infrared LEDs series connection; During work, the electric current that each infrared LED flows through is determined according to selected infrared LED rated current, makes selected infrared LED reach rated working current value by regulating current-limiting resistance;
Described voltage stabilizing circuit 106 provides stable voltage to power to control circuit 103 and other components and parts;
Described crystal oscillating circuit 107 provides clock pulse for control circuit 103;
Described reset circuit 108 can restart in when debugging or fault light modulated light filling in season.
As shown in Figure 2, the flow chart of the light modulated light compensation method of using for a kind of recognition of face, this light compensation method comprises following steps:
Step 4, control circuit 103 (single-chip microcomputer) calculate high level duty ratio Pn, jump to step 5;
Pn＝((P1-P0)/(V1-V0))*(Vn-V0)+P0；
Wherein, obtain digital quantity magnitude of voltage V1 and duty ratio P1 under the sunburst environment by step 4.1; Obtain digital quantity magnitude of voltage V0 and duty ratio P0 under the dark surrounds by step 4.2;
Step 4.1, under sunburst, gather, and be V1 through optical sensor 101 (photo resistance) through the magnitude of voltage of A/D conversion, establish duty ratio P1=1;
Step 4.2, under dark surrounds, the magnitude of voltage of gathering, also changing through A/D through optical sensor 101 (photo resistance) is V0, adjust duty ratio P0, the facial image brightness that makes camera take can reach the requirement of recognition of face, and (decision method of specific requirement is: the image (such as 4000 or 5000) of the some that obtains is carried out recognition of face, to the result that people's face detects, just can judge that can the facial image brightness of camera shooting reach the requirement of recognition of face according to face identification method.(can detect people's face such as the overwhelming majority in 4000 or 5000, have only 4 to 5 can not detect people's face, detect mortality, just judge the requirement that can reach recognition of face) less than one thousandth), thus duty ratio P0 under the dark surrounds obtained;
Step 5, control circuit 103 (single-chip microcomputer) output duty cycle are that the pwm pulse signal of Pn is given infrared LED drive circuit 104;
Step 6, infrared LED drive circuit 104 are exported to infrared LED array 105 after pwm pulse signal is amplified;
Step 6.1, regulate the current-limiting resistance of series connection, determine the operating current of every group of LED according to the infrared LED characteristic; (be connected on every group of current-limiting resistance in the infrared LED circuit by change and regulate, the scope of operating current is determined according to the rated operational current of selected infrared LED);
Step 6.2, determine the group number of LED according to the picture quality behind the light filling under the sunburst, concrete steps are: keep infrared LED Chang Liang, progressively increase the also joint group number of infrared LED, in the facial image that makes camera take, can effectively get rid of the interference that sunlight causes, obtain desirable image;
The interference that sunlight causes recognition of face, mainly contain the shade that sunlight direct projection from top to bottom causes on the face the people, as the black face problem of the shade of below, outstanding position such as nose, eyebrow, sunlight facial image from the left side or when the negative and positive face problem that causes on the face the people of right side oblique fire and backlight, all be interference to recognition of face.Progressively increase group number in parallel during debugging, make infrared light that the whole LED array sends along with and the increase of joint group number progressively strengthen, infrared light just increases with respect to the ratio of sunlight, when this ratio increases to a certain degree, shade, negative and positive face and black face just are illuminated, the picture quality that obtains is just high, the concrete method of judging is: the image (such as 4000 or 5000) of the some that obtains is carried out recognition of face, to the result that people's face detects, just can judge the interference of whether effectively having got rid of sunlight according to face identification method.(can detect people's face such as the overwhelming majority in 4000 or 5000, have only 4 to 5 can not detect people's face, detect mortality, just can judge effective interference of getting rid of sunlight) less than one thousandth;
Step 7, infrared LED array 105 send the infrared light through the PWM modulation, jump to step 1;
Wherein, step 4.1,4.2,6.1,6.2 debug phases before light compensating apparatus moves for the first time carry out, and the circulation execution in step 1,2,3,4,5,6,7 during the light compensating apparatus operate as normal.
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 (10)
1. light modulated light compensating apparatus that recognition of face is used is characterized in that this device comprises:
The optical sensor (101), divider resistance (102), control circuit (103), infrared LED drive circuit (104) and the infrared LED array (105) that connect of circuit successively;
Described optical sensor (101) is composed in series resistor voltage divider circuit with divider resistance (102).
2. the light modulated light compensating apparatus that recognition of face as claimed in claim 1 is used, it is characterized in that described light modulated light compensating apparatus also comprises voltage stabilizing circuit (106), crystal oscillating circuit (107) and the reset circuit (108) that circuit respectively connects described control circuit (103).
3. the light modulated light compensating apparatus that recognition of face as claimed in claim 1 is used is characterized in that, described infrared LED array (105) 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.
4. the light modulated light compensating apparatus that recognition of face as claimed in claim 1 is used, it is characterized in that described optical sensor (101) is selected any one in photodiode, phototransistor, photo resistance, infrared ray sensor, UV sensor, optical fiber type photoelectric transducer, color sensor, CCD charge coupled device and the CMOS cmos image sensor for use.
5. the light modulated light compensating apparatus that recognition of face as claimed in claim 4 is used is characterized in that, the preferred photo resistance of described optical sensor (101).
6. the light modulated light compensating apparatus that recognition of face as claimed in claim 1 is used is characterized in that, described control circuit (103) adopts single-chip microcomputer.
7. light modulated light compensation method that recognition of face is used is characterized in that this light compensation method comprises following steps:
Step 1, optical sensor (101) are gathered visible ambient light, and visible ambient light is converted to corresponding analog quantity resistance value, and optical sensor (101) is composed in series resistor voltage divider circuit with divider resistance (102);
Step 2, resistor voltage divider circuit are converted to analog voltage signal with the analog quantity resistance value and output to control circuit (103);
Step 3, control circuit (103) are converted to digital quantity magnitude of voltage Vn with analog voltage signal by A/D;
Step 4, control circuit (103) calculate high level duty ratio Pn, jump to step 5;
Pn＝((P1-P0)/(V1-V0))*(Vn-V0)+P0；
Wherein, obtain digital quantity magnitude of voltage V1 and duty ratio P1 under the sunburst environment by step 4.1; Obtain digital quantity magnitude of voltage V0 and duty ratio P0 under the dark surrounds by step 4.2;
Step 5, control circuit (103) output duty cycle are that the pwm pulse signal of Pn is given infrared LED drive circuit (104);
Step 6, infrared LED drive circuit (104) are exported to infrared LED array (105) after pwm pulse signal is amplified;
Step 7, infrared LED array (105) send the infrared light through the PWM modulation, jump to step 1.
8. the light modulated light compensation method that recognition of face as claimed in claim 7 is used is characterized in that, the debug phase before light compensating apparatus moves is for the first time carried out following steps:
Step 4.1, under sunburst, gather, and be V1 through optical sensor 101 through the magnitude of voltage of A/D conversion, establish duty ratio P1=1;
Step 4.2, under dark surrounds, the magnitude of voltage of gathering, also changing through A/D through optical sensor 101 is V0, progressively increase duty ratio since 0, the infrared light that led array sends also progressively increases, when adjusting to duty ratio P0, the facial image brightness that makes camera take can reach the requirement of recognition of face, thereby obtains the duty ratio P0 under the dark surrounds.
9. the light modulated light compensation method that recognition of face as claimed in claim 7 is used is characterized in that, the debug phase before light compensating apparatus moves is for the first time carried out following steps:
Step 6.1, regulate the current-limiting resistance of series connection, determine the operating current of every group of LED according to the infrared LED characteristic;
Step 6.2, determine the group number of LED according to the picture quality behind the light filling under the sunburst.
10. the light modulated light compensation method that recognition of face as claimed in claim 9 is used, it is characterized in that, the concrete steps of the group number of described definite LED are: keep infrared LED Chang Liang, progressively increase the also joint group number of infrared LED, in the facial image that makes camera take, can effectively get rid of the interference that sunlight causes, obtain desirable image.
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| CN110248441A (en) * | 2019-05-22 | 2019-09-17 | 鹰潭阳光照明有限公司 | A kind of intelligent light-controlled linear LED lamp circuit |
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Application publication date: 20101215 |