Constant image brightness automatic adjusting circuit

A constant brightness, automatic adjustment technology, applied in the direction of image communication, TV, electrical components, etc., to achieve the effect of fast response speed, stable and reliable adjustment method

Active Publication Date: 2015-02-11
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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

Method used

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  • Constant image brightness automatic adjusting circuit

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] like figure 1 As shown, an image constant brightness automatic adjustment circuit includes an outer loop position loop 1 and an inner loop speed loop 2, wherein the outer loop position loop 1 includes a position feedback loop 3, a comparison module A and a position loop computing network, and the position feedback The loop 3 is connected to the comparison module A, so that the camera grayscale signal received from the position feedback loop 3 is input to the comparison module A, and after comparing with the preset grayscale value received by the comparison module A, the comparison value is input to the comparison module A. The position loop calculation network connected to the comparison module A performs control signal processing based on the PID principle, wherein the position loop calculation network calculates the motor pos...

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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 [0001] The invention belongs to the technical field of automatic control of image brightness, and in particular relates to a circuit for automatic adjustment of image constant brightness. Background technique [0002] The image acquisition of the camera has been widely used in science and technology and industrial production, but in some special applications, such as the shape measurement of high-temperature forged workpieces, the surface light intensity of the measured object will change drastically as the temperature changes , and even make the measurement image saturated in brightness and unrecognizable. In order to improve the image quality, when the background light changes sharply and in a large range, 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 utilizing the polarization principle has a good effect, and the adjustment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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