A circuit for automatic adjustment of image constant brightness
A technology of constant brightness and automatic adjustment, applied in image communication, television, electrical components, etc., to achieve fast response and stable and reliable adjustment methods
Active Publication Date: 2018-11-02
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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[0005] The purpose of the present invention is to provide a circuit for automatic adjustment of image constant brightness, which can solve the problem of automatic adjustment of camera incident light intensity, and can keep the brightness of collected images constant without being affected by background light intensity
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[0016] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
[0017] Such as figure 1 As shown, an image constant brightness automatic adjustment circuit includes an outer loop position loop 1 and an inner loop rate loop 2. The outer loop position loop 1 includes a position feedback loop 3, a comparison module A and a position loop calculation network, and position feedback Loop 3 is connected with comparison module A, so that the camera grayscale signal received from position feedback loop 3 is input to comparison module A, and after comparing with the preset gray value received in comparison module A, the comparison value is input to and The position loop arithmetic network connected to phase A of the comparison module performs control signal processing based on the principle of PID. Among them, the position loop arithmetic network uses the existing lead-lag algorithm to calculate the motor position adjustmen...
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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 [0001] The invention belongs to the technical field of image brightness automatic control, and in particular relates to a circuit for automatically adjusting image constant brightness. Background technique [0002] Camera image acquisition has been widely used in science and technology and industrial production, but in some special applications, such as the shape measurement of high-temperature forging workpieces, with the temperature change, the surface light intensity of the measured object will change drastically , It will even make the measured image appear saturated with brightness and cannot be recognized. In order to improve the image quality, when the background light changes drastically and widely, it is necessary to adjust the incident light intensity to obtain an image with constant brightness under the condition of changing light intensity. [0003] The dimming structure using the polarization principle has a good effect, and the adjustment range of the...
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IPC IPC(8): H04N5/232H04N5/235
Inventor 孙增玉梁雅军刘柯宋金城陈晓晖
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH