CN104349034A - Constant image brightness automatic adjusting circuit - Google Patents
Constant image brightness automatic adjusting circuit Download PDFInfo
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- CN104349034A CN104349034A CN201310315603.6A CN201310315603A CN104349034A CN 104349034 A CN104349034 A CN 104349034A CN 201310315603 A CN201310315603 A CN 201310315603A CN 104349034 A CN104349034 A CN 104349034A
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Abstract
The invention relates to the image brightness automatic control technology field and particularly relates to a constant image brightness automatic adjusting circuit. According to the adjusting circuit, a set gray value signal and an output signal of a position feedback loop connected with an input end of a contrast module A are respectively received by two input ends of the contrast module A, an output end of the contrast module A is directly connected with a position loop operation network, two input ends of a contrast module B are respectively connected with the position loop operation network and an output end of a rate feedback loop, an output end of the contrast module B is connected with a rate loop operation network, an output end of the rate loop operation network is sequentially connected with a digital analog converter (DAC) and a power amplification module, and a motor driving control signal is outputted. Through feedback proportion coefficients and a lead-lag network of the two loops in the adjusting circuit, the system realizes high dynamic following and no concussion. The adjusting method is stable and reliable, the camera image can be constantly maintained at the set gray value, and the response speed is fast.
Description
Technical field
The invention belongs to Automatic control of image brightness technical field, be specifically related to the self-adjusting circuit of a kind of image constant luminance.
Background technology
The IMAQ of camera is widely used in science and technology and industrial production, but in the application scenario that some are special, during profile as high temperature forging workpiece is measured, along with the change of temperature, can acute variation be there is in the surperficial light intensity of testee, measurement image even can be made to occur luminance saturation, cannot the situation of identification.In order to improve picture quality, when background light occur sharply wide variation time, need light to regulate incident intensity, obtain the image of constant luminance under change light-intensity conditions.
The light modulation structure of polarization theory is utilized to have good effect, and larger to the adjustable range of intensity of illumination.Polarizer constructions is close together by two polarizers and is formed, and wherein one maintains static, and during another Zhang Xuanzhuan, the angle of two polarizers will change.After two polarizers, light intensity meets: E=1/2E
0cos
2θ, wherein: E
0for original light intensity; θ is two polarizer polarization direction angles.
But in the application at present to polarizer light intensity regulating, the angle between polarizer is often relatively fixing, regulating in real time and quantitatively intensity of illumination therefore cannot be accomplished.Domestic also have in pertinent literature the proportionate relationship adopting lookup table mode to obtain outside light intensity and the polarizer anglec of rotation, and using this angle as controlled quentity controlled variable, change polarizer angle by motor and regulate incident intensity, but when camera inherent parameters (as aperture, time for exposure) changes, all need again to revise look-up table, and this control mode can produce the effect of jitter picture quality of motor.
Summary of the invention
The object of the present invention is to provide the self-adjusting circuit of a kind of image constant luminance, the problem that camera entrance light intensity regulates automatically can be solved, and it is constant to keep gathering image brightness, does not affect by background light intensity.
Technical scheme of the present invention is as follows: a kind of image constant luminance automatic circuit, this Circuit tuning comprises outer shroud position loop and inner ring rate loop, wherein, outer shroud position loop comprises position feedback loop, comparison module A and position loop operational network, the output signal in position feedback loop that two inputs of comparison module A receive setting gray value signal respectively and are connected with comparison module A input, the output of comparison module A is directly directly connected with position loop operational network; Inner ring rate loop comprises Rate Feedback loop, comparison module B, rate loop operational network, digital to analog converter DAC and power amplifier module, wherein, two inputs of comparison module B are connected with the output of position loop operational network with Rate Feedback loop respectively, the output of comparison module B is connected with rate loop operational network, and the output of rate loop operational network is connected with power amplifier module with digital to analog converter DAC successively, output motor drive control signal.
Described position feedback loop (3) comprises position feedback coefficient module and serial communication modular, wherein, camera grey scale signal is after the serial communication modular comprised by position feedback loop, after the position feedback coefficient module process that position feedback loop comprises, input to comparison module A.
Described position feedback coefficient module is for regulating the proportionate relationship between the camera grey scale signal of feedback and the setting gray value inputing to comparison module A.
Described Rate Feedback loop comprises operation amplifier module, analog to digital converter ADC and Rate Feedback coefficient, wherein, motor velocity signal is successively after the operation amplifier module that comprises of through-rate feedback loop 4 and analog to digital converter ADC, after the Rate Feedback coefficient module process that Rate Feedback loop 4 comprises, input to comparison module B.
Described Rate Feedback coefficient module is for regulating the motor velocity signal of feedback and being produced by outer shroud position loop and to input to the proportionate relationship of the motor position regulated quantity conditioning signal of inner ring rate loop.
Described position loop operational network, by existing lead-lag algorithm, extrapolates motor position regulated quantity, and this conditioning signal inputs in inner ring rate loop as input signal.
Described rate loop operational network adopts lead-lag algorithm, calculates motor speed regulated quantity, after obtaining motor speed regulated quantity conditioning signal, directly through digital to analog converter DAC and power amplifier module output motor drive control signal.
Remarkable result of the present invention is: the self-adjusting circuit of a kind of image constant luminance of the present invention, by feedback proportional coefficient and the lead-lag network in two loops in Circuit tuning, makes system reach high dynamic following and not shake.Experimental result shows, and this method of adjustment is reliable and stable, and when background light intensity generation acute variation, camera image all-the-time stable can set gray value, and fast response time, gray scale bias is not more than 1.
Accompanying drawing explanation
Fig. 1 is the self-adjusting circuit block diagram of a kind of image constant luminance of the present invention;
In figure: 1, outer shroud position loop; 2, inner ring rate loop; 3, position feedback loop; 4, Rate Feedback loop.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the self-adjusting circuit of a kind of image constant luminance, comprise outer shroud position loop 1 and inner ring rate loop 2, wherein, outer shroud position loop 1 comprises position feedback loop 3, comparison module A and position loop operational network, position feedback loop 3 is connected with comparison module A, the camera grey scale signal received from position feedback loop 3 is made to input to comparison module A, and after gray value compares with presetting of receiving at comparison module A, comparison value is inputed to the control signal process that the position loop operational network be connected with comparison module A carries out based on PID principle, wherein, position loop operational network is by existing lead-lag algorithm, extrapolate motor position regulated quantity, this conditioning signal inputs in inner ring rate loop 2 as input signal, input in the circuit of comparison module A at camera grey scale signal by position feedback loop 3, camera grey scale signal is after the serial communication modular comprised by position feedback loop 3, after the position feedback coefficient module process that position feedback loop 3 comprises, input to comparison module A, wherein, position feedback coefficient module is for regulating the proportionate relationship between the camera grey scale signal of feedback and the setting gray value inputing to comparison module A, inner ring rate loop 2 comprises Rate Feedback loop 4, comparison module B, rate loop operational network, digital to analog converter DAC and power amplifier module, wherein, comparison module B is inputed to after the process of motor velocity signal through-rate feedback loop 4, and after comparing with the motor position regulated quantity conditioning signal inputing to inner ring rate loop 2, difference relatively inputs to after the rate loop operational network be directly connected with comparison module B carries out computing, after the digital to analog converter DAC that is connected successively with rate loop operational network and power amplifier module, output motor drive control signal, wherein, rate loop operational network adopts lead-lag algorithm, calculate motor speed regulated quantity, after obtaining motor speed regulated quantity conditioning signal, directly export through digital to analog converter DAC and power amplifier module, input in the process of comparison module B after the process of motor velocity signal through-rate feedback loop 4, motor velocity signal is successively after the operation amplifier module that comprises of through-rate feedback loop 4 and analog to digital converter ADC, comparison module B is inputed to after the Rate Feedback coefficient module process that Rate Feedback loop 4 comprises, wherein, Rate Feedback coefficient module is for regulating the motor velocity signal of feedback and being produced by outer shroud position loop 1 and to input to the proportionate relationship of the motor position regulated quantity conditioning signal of inner ring rate loop 2.
In the self-adjusting circuit of a kind of image constant luminance of the present invention, after serial communication modular in position feedback loop 3 collects the proportional difference of camera grey scale signal and setting gray value, after loop operation network processes in position in outer shroud position loop 1, obtain motor position regulated quantity conditioning signal, after this signal and motor velocity signal proportional difference, obtain drive and control of electric machine signal, rotated by drive unit drives motor, adjustment incident intensity.In the present invention, arrange the Interruption of 1kHz, every 1ms is that one-period completes once above-mentioned double loop feedback procedure.When the change of measured object light intensity, camera grey scale signal is caused to change, by changing motor movement rate controlled signal after above-mentioned control algorithm, each cycle performs once this network operations, continuous correction motor speed control signal, make motor position keep servo-actuated with light intensity, drive the angle change of polarizer, realize camera entrance light intensity constant.
Claims (7)
1. an image constant luminance automatic circuit, it is characterized in that: this Circuit tuning comprises outer shroud position loop (1) and inner ring rate loop (2), wherein, outer shroud position loop (1) comprises position feedback loop (3), comparison module A and position loop operational network, the output signal in position feedback loop (3) that two inputs of comparison module A receive setting gray value signal respectively and are connected with comparison module A input, the output of comparison module A is directly directly connected with position loop operational network; Inner ring rate loop (2) comprises Rate Feedback loop (4), comparison module B, rate loop operational network, digital to analog converter DAC and power amplifier module, wherein, two inputs of comparison module B are connected with the output of position loop operational network with Rate Feedback loop (4) respectively, the output of comparison module B is connected with rate loop operational network, and the output of rate loop operational network is connected with power amplifier module with digital to analog converter DAC successively, output motor drive control signal.
2. a kind of image constant luminance automatic circuit according to claim 1, it is characterized in that: described position feedback loop (3) comprises position feedback coefficient module and serial communication modular, wherein, camera grey scale signal is after the serial communication modular comprised by position feedback loop (3), after the position feedback coefficient module process that position feedback loop (3) comprise, input to comparison module A.
3. a kind of image constant luminance automatic circuit according to claim 2, is characterized in that: described position feedback coefficient module is for regulating the proportionate relationship between the camera grey scale signal of feedback and the setting gray value inputing to comparison module A.
4. a kind of image constant luminance automatic circuit according to claim 1, it is characterized in that: described Rate Feedback loop (4) comprises operation amplifier module, analog to digital converter ADC and Rate Feedback coefficient, wherein, motor velocity signal is successively after the operation amplifier module that comprises of through-rate feedback loop 4 and analog to digital converter ADC, after the Rate Feedback coefficient module process that Rate Feedback loop 4 comprises, input to comparison module B.
5. a kind of image constant luminance automatic circuit according to claim 4, is characterized in that: described Rate Feedback coefficient module is for regulating the motor velocity signal of feedback and being produced by outer shroud position loop (1) and to input to the proportionate relationship of the motor position regulated quantity conditioning signal of inner ring rate loop (2).
6. a kind of image constant luminance automatic circuit according to claim 1, it is characterized in that: described position loop operational network is by existing lead-lag algorithm, extrapolate motor position regulated quantity, this conditioning signal inputs in inner ring rate loop (2) as input signal.
7. a kind of image constant luminance automatic circuit according to claim 1, it is characterized in that: described rate loop operational network adopts lead-lag algorithm, calculate motor speed regulated quantity, after obtaining motor speed regulated quantity conditioning signal, directly through digital to analog converter DAC and power amplifier module output motor drive control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310315603.6A CN104349034B (en) | 2013-07-25 | 2013-07-25 | A kind of circuit of image constant luminance adjust automatically |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310315603.6A CN104349034B (en) | 2013-07-25 | 2013-07-25 | A kind of circuit of image constant luminance adjust automatically |
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| CN104349034A true CN104349034A (en) | 2015-02-11 |
| CN104349034B CN104349034B (en) | 2018-11-02 |
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| CN201310315603.6A Active CN104349034B (en) | 2013-07-25 | 2013-07-25 | A kind of circuit of image constant luminance adjust automatically |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546598A (en) * | 2016-10-28 | 2017-03-29 | 鞍钢未来钢铁研究院 | Belt steel surface detecting system light source self-adaptation control method |
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| US20060291075A1 (en) * | 2005-06-27 | 2006-12-28 | Pentax Corporation | An imaging device having a polarizing filter, and a method of controlling rotation of a polarizing filter of an imaging device |
| CN101644600A (en) * | 2008-12-25 | 2010-02-10 | 长春理工大学 | Embedded type laser beam quality measuring device |
| CN103048798A (en) * | 2012-12-29 | 2013-04-17 | 深圳市时代华影科技开发有限公司 | High-light-efficiency light modulation device and high-light-efficiency (3-dimensional) 3D projection system |
| CN203377962U (en) * | 2013-07-25 | 2014-01-01 | 北京航天计量测试技术研究所 | Image constant brightness automatic adjustment circuit |
-
2013
- 2013-07-25 CN CN201310315603.6A patent/CN104349034B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060291075A1 (en) * | 2005-06-27 | 2006-12-28 | Pentax Corporation | An imaging device having a polarizing filter, and a method of controlling rotation of a polarizing filter of an imaging device |
| CN101644600A (en) * | 2008-12-25 | 2010-02-10 | 长春理工大学 | Embedded type laser beam quality measuring device |
| CN103048798A (en) * | 2012-12-29 | 2013-04-17 | 深圳市时代华影科技开发有限公司 | High-light-efficiency light modulation device and high-light-efficiency (3-dimensional) 3D projection system |
| CN203377962U (en) * | 2013-07-25 | 2014-01-01 | 北京航天计量测试技术研究所 | Image constant brightness automatic adjustment circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546598A (en) * | 2016-10-28 | 2017-03-29 | 鞍钢未来钢铁研究院 | Belt steel surface detecting system light source self-adaptation control method |
| CN106546598B (en) * | 2016-10-28 | 2019-09-24 | 鞍钢未来钢铁研究院有限公司 | Belt steel surface detection system light source self-adaptation control method |
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| CN104349034B (en) | 2018-11-02 |
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