CN108495422B - Method and circuit for automatically controlling infrared lamp current according to scene - Google Patents
Method and circuit for automatically controlling infrared lamp current according to scene Download PDFInfo
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- CN108495422B CN108495422B CN201810517735.XA CN201810517735A CN108495422B CN 108495422 B CN108495422 B CN 108495422B CN 201810517735 A CN201810517735 A CN 201810517735A CN 108495422 B CN108495422 B CN 108495422B
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- 239000003990 capacitor Substances 0.000 claims description 18
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- 101100365013 Arabidopsis thaliana SCL3 gene Proteins 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Abstract
The invention discloses a method and a circuit for automatically controlling infrared lamp current according to a scene, which comprises a micro-control chip and a main chip, wherein the micro-control chip can write a register through I2C to control the output current, and the method comprises the following steps: the main chip is connected or disconnected with the micro-control chip circuit through the GPIO, different register values are written in through the I2C interface to adjust the pulse width of the output current, the current of the infrared lamp is dynamically controlled, and the brightness and the power of the infrared lamp are further controlled. The invention can dynamically adjust the current of the infrared lamp in the using process, dynamically adapt to more application scenes, save power supply, enable equipment to quickly acquire ideal iris pictures and reduce average energy consumption.
Description
Technical Field
The invention relates to the technical field of control of infrared lamp current, in particular to a method and a circuit for automatically controlling infrared lamp current according to a scene.
Background
Iris recognition is the most characteristic point and the most unique biological recognition technology in the current biological recognition field, and is increasingly applied to mobile electronic equipment for individual identification and authentication. Experiments show that the iris area of human eyes shows more obvious details under infrared band light, meanwhile, in order to know the use of iris recognition equipment under different light conditions, an infrared lamp is required to be added in equipment design for infrared light filling, mobile equipment can only select infrared lamp beads with large single-point heating value and strong power due to the influences of machine body thickness, space size and the like, equipment is easy to generate large local heating value, the problem of insufficient heat dissipation and the like, the service life of the infrared lamp and the stability of the equipment are influenced, in addition, once infrared lamp current in the prior art cannot be changed, the power is constant, the current can only be set according to ideal working distance, the short-distance reflectivity is too strong and overexposure is caused, and the long-distance brightness is insufficient and too dark.
Disclosure of Invention
The invention aims to automatically and dynamically adjust the infrared lamp current according to environmental changes, acquire ideal input images, accelerate the processing speed of an iris recognition algorithm, and simultaneously avoid the problems of low speed of acquiring ideal images under the conditions of short-distance overexposure, long-distance overexposure and constant power when the current is fixed, large heat dissipation capacity caused by high average power, and the like. The method and the circuit for automatically controlling the infrared lamp current according to the scene are provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for automatically controlling infrared lamp current according to a scene, comprising a micro control chip and a main chip, wherein the micro control chip can write a register through I2C to control the output current, and the method is characterized by comprising the following steps:
a1: the main chip is connected or disconnected with the micro-control chip circuit through the GPIO, and the current pulse width is modulated through the I2C interface, so that the current of the infrared lamp is dynamically controlled, and the brightness and the power of the infrared lamp are further controlled.
Specific: in the implementation process for A1, the specific steps are as follows:
s1, setting a multi-gear current pulse width according to the maximum current in the hardware circuit design;
s2, measuring the influence of different current sizes on the image exposure balance parameters under the condition of pulse width current of each gear, and calculating the exposure balance;
and S3, dynamically adjusting the current of the infrared lamp according to the feedback of the image scene.
Specific: the exposure balance equation of step S2 is: av+tv=sv+lv
AV is the logarithm of the current pulse width corresponding to the constant parameter;
TV is the logarithm of the exposure time corresponding to the constant parameter;
SV is the logarithm of the gain magnitude corresponding to the constant parameter;
LV is the logarithm of the feedback brightness versus the constant parameter.
Specific: when the influence of the pulse width current of each gear on the balance equation is calculated, setting TV, keeping SV constant, under ideal light source, measuring the corresponding change of brightness value LV when each gear AV changes, adjusting AV parameters according to the value of each gear ideal light source LV until the equation error is minimum under all ideal light source conditions, obtaining AV parameters under each gear pulse width current, and establishing the balance equation.
Specific: the specific operation steps of the step A1 are as follows:
b1: the main control chip is selectively connected or disconnected with the micro control chip through GPIO_FLASH_EN;
b2, synchronously providing a micro-control chip clock through FLASH EN SYNC;
b3, selecting a micro-control chip control circuit channel through GPIO_FLASH_SEL;
b4, controlling the current of the gating channel through an I2C interface 'SCL 3' and 'SDA 3';
on the other hand, the embodiment of the invention also provides a circuit for automatically controlling the infrared lamp current according to the scene, which comprises a micro-control chip and a main chip, wherein the micro-control chip can write a register through I2C to control the output current, the GPIO pin of the main chip is connected with the CMPCLK pin of the micro-control chip, the STROBE pin of the main chip is connected with the CMDAT0 pin of the micro-control chip, and the EN pin of the main chip is connected with the CMDAT1 pin of the micro-control chip; the SCL pin of the main chip is connected with the SCL pin of the micro-control chip, and the SDA pin of the main chip is connected with the SDA pin of the micro-control chip.
Specific: the circuit also comprises a resistor R2311 and a resistor R2312, wherein one end of the resistor R2311 is connected with a STROBE pin of the main chip, and the other end of the resistor R2311 is grounded; one end of the resistor R2312 is connected to the EN pin of the main chip, and the other end of the resistor R2312 is grounded.
Specific: the LED2 pin of the main chip is connected with the anode of the LED lamp, and the cathode of the LED lamp is grounded.
Specific: the LED1 pin of the main chip is connected with an IR_LED for compensating exposure brightness.
Specific: the SW pin of the main chip is connected with one end of an inductor L2301, the other end of the inductor L2301 is connected with a power supply VBAT, and the circuit also comprises a capacitor C2333 and a capacitor C2322, wherein one end of the capacitor C2333 is connected with the VBAT, and the other end of the capacitor C2322 is grounded; the VOUT pin of the main chip is connected to a capacitor C2332, and the other end of the capacitor C2332 is grounded.
The method and the circuit for automatically controlling the infrared lamp current according to the scene provided by the invention have the beneficial effects that: according to the scheme, the current of the infrared lamp can be dynamically adjusted in the using process, the infrared lamp is dynamically adapted to more application scenes, the power supply is saved, the equipment can quickly acquire an ideal iris picture, and the average energy consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of a main chip of a circuit for automatically controlling infrared lamp current according to a scene;
FIG. 2 is a circuit diagram of a circuit for automatically controlling infrared lamp current according to a scene according to the present invention;
fig. 3 is a schematic diagram of a connection structure of electrical components in a circuit diagram of a circuit for automatically controlling infrared lamp current according to a scenario according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1-3, a method for automatically controlling infrared lamp current according to a scene includes a micro control chip capable of controlling the output current through writing an I2C into a register, and a main chip, wherein the main chip selectively turns on or off the micro control chip through a "gpio_flash_en", synchronously provides a micro control chip clock through a "flash_en_sync", selectively controls a circuit channel through the "gpio_flash_sel", and controls the current of a gating channel through I2C interfaces "SCL3" and "SDA 3". The main chip is connected or disconnected with the micro-control chip circuit through the GPIO, different register values are written into through the I2C interface to modulate the current pulse width, the current of the infrared lamp is dynamically controlled, and the brightness and the power of the infrared lamp are further controlled.
According to the maximum current in the hardware circuit design, setting a multi-gear current pulse width, measuring the influence of different current sizes under the current conditions of each gear pulse width on the image exposure balance parameter, calculating the exposure balance, and dynamically adjusting the current size of the infrared lamp according to the feedback of the image scene.
The exposure balance equation is: av+tv=sv+lv
AV is the logarithm of the current pulse width corresponding to the constant parameter;
TV is the logarithm of the exposure time corresponding to the constant parameter;
SV is the logarithm of the gain magnitude corresponding to the constant parameter;
LV is the logarithm of the feedback brightness corresponding to the constant parameter;
when the influence of the pulse width current of each gear on the balance equation is calculated, setting TV, keeping SV constant, under ideal light source, measuring the corresponding change of brightness value LV when each gear AV changes, adjusting AV parameters according to the value of each gear ideal light source LV until the equation error is minimum under all ideal light source conditions, obtaining AV parameters under each gear pulse width current, and establishing the balance equation.
To sum up: the main control chip is selectively connected or disconnected with the micro-control chip through the GPIO_FLASH_EN, the micro-control chip is selected through the GPIO_FLASH_SEL to control the infrared lamp passage, and different register values are written into through the I2C interface to control and change the current of the gated infrared lamp. The method comprises the steps of pre-grading 10-level brightness change in a laboratory, measuring the influence on the balance type of an automatic exposure algorithm under the condition of current brightness of each level, determining exposure balance type parameters, dynamically adjusting the current of an infrared lamp according to automatic exposure brightness feedback in an actual scene, dynamically adapting to more application scenes, saving power of a power supply, enabling equipment to quickly acquire ideal iris pictures, and reducing average energy consumption.
On the other hand, the embodiment of the invention also provides a circuit for automatically controlling the infrared lamp current according to the scene, which comprises a micro-control chip and a main chip, wherein the micro-control chip can write a register through I2C to control the output current, the GPIO pin of the main chip is connected with the CMPCLK pin of the micro-control chip, the STROBE pin of the main chip is connected with the CMDAT0 pin of the micro-control chip, and the EN pin of the main chip is connected with the CMDAT1 pin of the micro-control chip; the SCL pin of the main chip is connected with the SCL pin of the micro-control chip, and the SDA pin of the main chip is connected with the SDA pin of the micro-control chip. The circuit also comprises a resistor R2311 and a resistor R2312, wherein one end of the resistor R2311 is connected with a STROBE pin of the main chip, and the other end of the resistor R2311 is grounded; one end of the resistor R2312 is connected to the EN pin of the main chip, and the other end of the resistor R2312 is grounded. The LED2 pin of the main chip is connected with the anode of the LED lamp, and the cathode of the LED lamp is grounded. The LED1 pin of the main chip is connected with an IR_LED for compensating exposure brightness. The SW pin of the main chip is connected with one end of an inductor L2301, the other end of the inductor L2301 is connected with a power supply VBAT, and the circuit also comprises a capacitor C2333 and a capacitor C2322, wherein one end of the capacitor C2333 is connected with the VBAT, and the other end of the capacitor C2322 is grounded; the VOUT pin of the main chip is connected to a capacitor C2332, and the other end of the capacitor C2332 is grounded.
According to the scheme, the current of the infrared lamp can be dynamically adjusted in the using process, the infrared lamp is dynamically adapted to more application scenes, the power supply is saved, the equipment can quickly acquire an ideal iris picture, and the average energy consumption is reduced.
To sum up: the main control chip is selectively connected or disconnected with the micro-control chip through the GPIO_FLASH_EN, the micro-control chip is selected through the GPIO_FLASH_SEL to control the infrared lamp passage, and different register values are written into through the I2C interface to control and change the current of the gated infrared lamp. The method comprises the steps of pre-grading 10-level brightness change in a laboratory, measuring the influence on the balance type of an automatic exposure algorithm under the condition of current brightness of each level, determining exposure balance type parameters, dynamically adjusting the current of an infrared lamp according to automatic exposure brightness feedback in an actual scene, dynamically adapting to more application scenes, saving power of a power supply, enabling equipment to quickly acquire ideal iris pictures, and reducing average energy consumption.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. A method for automatically controlling infrared lamp current according to a scene, comprising a micro control chip and a main chip, wherein the micro control chip can write a register through I2C to control the output current, and the method is characterized by comprising the following steps:
a1: the main chip is connected or disconnected with the micro-control chip circuit through the GPIO, different register values are written in through the I2C interface to adjust the pulse width of the output current, the current of the infrared lamp is dynamically controlled, and the brightness and the power of the infrared lamp are further controlled;
in the implementation process for A1, the specific steps are as follows:
s1, setting a multi-gear current pulse width according to the maximum current and the frequency in the hardware circuit design;
s2, measuring the influence of different current sizes on the image exposure balance parameters under the current pulse width condition of each gear, and calculating the exposure balance;
and S3, dynamically adjusting the current of the infrared lamp according to the feedback of the image scene.
2. The method for automatically controlling infrared lamp current according to scene as set forth in claim 1, wherein the exposure balance equation of step S2 is: av+tv=sv+lv;
AV is the logarithm of the current pulse width corresponding to the constant parameter;
TV is the logarithm of the exposure time corresponding to the constant parameter;
SV is the logarithm of the gain magnitude corresponding to the constant parameter;
LV is the logarithm of the feedback brightness versus the constant parameter.
3. The method for automatically controlling the infrared lamp current according to the scene as set forth in claim 2, wherein when the influence of the current pulse width of each current stage on the balance equation is calculated, the TV is set, the SV is constant, under the ideal light source, when the AV change of each stage is measured, the corresponding change of the brightness value LV is measured, the AV parameters are adjusted according to the LV value of each ideal light source until the equation error is the minimum under all ideal light sources, the AV parameters under each current pulse width can be obtained, and the equation balance is established.
4. The method for automatically controlling the infrared lamp current according to the scene as set forth in claim 1, wherein the specific operation steps of step A1 are as follows:
b1: the main control chip is selectively connected or disconnected with the micro control chip through GPIO_FLASH_EN;
b2, synchronously providing a micro-control chip clock through FLASH EN SYNC;
b3, selecting a micro-control chip control circuit channel through GPIO_FLASH_SEL;
b4, controlling the magnitude of the gating channel current through the I2C interfaces SCL3 and SDA 3.
5. A circuit for automatically controlling infrared lamp current according to a scene, which adopts the method for automatically controlling infrared lamp current according to a scene as set forth in any one of claims 1 to 4, characterized in that: the micro-control chip capable of controlling the output current by writing the I2C into the register and the main chip are included, wherein the GPIO pin of the main chip is connected with the CMPCLK pin of the micro-control chip, the STROBE pin of the main chip is connected with the CMDAT0 pin of the micro-control chip, and the EN pin of the main chip is connected with the CMDAT1 pin of the micro-control chip; the SCL pin of the main chip is connected with the SCL pin of the micro-control chip, and the SDA pin of the main chip is connected with the SDA pin of the micro-control chip.
6. A circuit for automatically controlling infrared lamp current according to a scenario as set forth in claim 5, wherein: the circuit also comprises a resistor R2311 and a resistor R2312, wherein one end of the resistor R2311 is connected with a STROBE pin of the main chip, and the other end of the resistor R2311 is grounded; one end of the resistor R2312 is connected to the EN pin of the main chip, and the other end of the resistor R2312 is grounded.
7. A circuit for automatically controlling infrared lamp current according to a scenario as set forth in claim 5, wherein: the LED2 pin of the main chip is connected with the anode of the LED lamp, and the cathode of the LED lamp is grounded.
8. A circuit for automatically controlling infrared lamp current according to a scenario as set forth in claim 5, wherein: the LED1 pin of the main chip is connected with an IR_LED for compensating exposure brightness.
9. A circuit for automatically controlling infrared lamp current according to a scenario as set forth in claim 5, wherein: the SW pin of the main chip is connected with one end of an inductor L2301, the other end of the inductor L2301 is connected with a power supply VBAT, and the circuit also comprises a capacitor C2333 and a capacitor C2322, wherein one end of the capacitor C2333 is connected with the VBAT, and the other end of the capacitor C2322 is grounded; the VOUT pin of the main chip is connected to a capacitor C2332, and the other end of the capacitor C2332 is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810517735.XA CN108495422B (en) | 2018-05-25 | 2018-05-25 | Method and circuit for automatically controlling infrared lamp current according to scene |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810517735.XA CN108495422B (en) | 2018-05-25 | 2018-05-25 | Method and circuit for automatically controlling infrared lamp current according to scene |
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| CN108495422B true CN108495422B (en) | 2024-01-19 |
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| CN101872106A (en) * | 2010-05-21 | 2010-10-27 | 深圳市艾威视数码科技有限公司 | Intelligent infrared camera and intelligent infrared light intensity adjustment method thereof |
| CN101917794A (en) * | 2010-06-28 | 2010-12-15 | 浙江大华技术股份有限公司 | Circuit and method for performing adaptive quantization adjustment on power of infrared lamps of infrared camera |
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| CN208190973U (en) * | 2018-05-25 | 2018-12-04 | 深圳市明天生物识别科技有限公司 | A kind of circuit automatically controlling infrared lamp current according to scene |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160212317A1 (en) * | 2015-01-15 | 2016-07-21 | Motorola Mobility Llc | 3d ir illumination for iris authentication |
| US20170061210A1 (en) * | 2015-08-26 | 2017-03-02 | Intel Corporation | Infrared lamp control for use with iris recognition authentication |
-
2018
- 2018-05-25 CN CN201810517735.XA patent/CN108495422B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872106A (en) * | 2010-05-21 | 2010-10-27 | 深圳市艾威视数码科技有限公司 | Intelligent infrared camera and intelligent infrared light intensity adjustment method thereof |
| CN101917794A (en) * | 2010-06-28 | 2010-12-15 | 浙江大华技术股份有限公司 | Circuit and method for performing adaptive quantization adjustment on power of infrared lamps of infrared camera |
| CN102821250A (en) * | 2012-08-23 | 2012-12-12 | 青岛海信网络科技股份有限公司 | Automatic dimming method and device of infrared camera |
| CN104394311A (en) * | 2014-09-15 | 2015-03-04 | 沈洪泉 | Iris identification imaging module for mobile terminal and image acquisition method |
| CN208190973U (en) * | 2018-05-25 | 2018-12-04 | 深圳市明天生物识别科技有限公司 | A kind of circuit automatically controlling infrared lamp current according to scene |
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