Control method for improving imaging quality of CMOS image sensor

Abstract

The invention discloses a control method for improving the imaging quality of a CMOS image sensor, and the method comprises the steps: setting expected brightness, and carrying out the statistics of a current image brightness mean value; setting a plurality of adjustable control parameters, wherein the control parameters at least comprise exposure time, charge voltage conversion gain, PGA gain, ramp voltage and digital gain; calculating whether the current image brightness mean value is matched with the expected brightness, if so, not adjusting, and if not, executing an adjusting step; and an adjusting step: adjusting the control parameters one by one, counting a current image brightness mean value after any one control parameter is adjusted, calculating whether the current image brightness mean value is matched with expected brightness, if so, ending the adjustment of the control parameters, and if not, continuing to adjust the current parameter or other parameters, until the brightness mean value of the current image is matched with the expected brightness, so that a high-quality image with moderate brightness, relatively low noise and relatively large dynamic range is obtained.

Description

Technical field [0001] The present invention relates to the field of image sensor imaging quality control technology, and more particularly to a method of improving the quality of the CMOS image sensor imaging quality. Background technique [0002] The image quality is determined by a variety of factors, including the brightness, noise, and dynamic range of the image, and the moderate brightness is the basis of a high quality image, and the noise and dynamic range determine the details of the image. [0003] The CMOS image sensor is one of the representatives of the visible light solid image sensor, with low cost, low power, high integration, and response speed fast. When the CMOS image sensor imaging, the parameters of the image brightness include exposure time, pixel signal conversion gain, PGA gain, ramp voltage, digital gain, and the like. [0004] Currently, in order to obtain an image of the brightness, the common automatic exposure algorithm is to change the exposure time ...

AI Technical Summary

Problems solved by technology

[0004] At present, in order to obtain an image with constant brightness, the common automatic exposure algorithm is to change the exposure time and digital gain of the image sensor, but due to the limited adjustment range of the exposure time, too long exposure time will reduce the frame rate of the image, and the digital gain Adjustment is easy to amplify the noise, which will reduce the image quality and cannot meet the imaging requirements of CMOS image sensors in different working environments

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