Method and system for detecting dead pixels of image sensor

Abstract

The invention provides a method and a system for detecting dead pixels of an image sensor. The method comprises the following steps: using the image sensor to respectively collect monochrome images corresponding to plural monochrome panels of different colors; performing pixel analysis to each monochrome image, and recording the obtained dead pixel coordinates of each monochrome image in each monochrome dead pixel list; and comparing the monochrome dead pixel lists one another to comprehensively determine the dead pixel coordinates of the image sensor. The invention also provides the system for detecting dead pixels of an image sensor, which comprises a monochrome image obtaining module, a pixel analyzing module and a dead pixel determining module. The invention can detect dead pixels under multi-color environment, can detect dead pixels of different conditions more accurately, improves accuracy of dead pixel detection, analyzes the dead pixel list of each monochrome image comprehensively, divides different dead pixel grades, and can adapt to requirements of different detection quality with strong flexibility.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and system for detecting dead pixels of an image sensor. Background technique [0002] Current digital video and image products require image sensors to capture raw images. Due to process and raw material limitations, image sensors often have dead pixels. The so-called dead pixels refer to pixels that do not change with the sensitivity and always present the same color (such as white, black or colored dots). It is not sensitive to different input images and always outputs a fixed pixel value. The detection and processing of dead pixels can greatly improve the image quality. [0003] Usually, the method of image sensor dead point detection is: in a completely dark environment (for example, a completely dark environment can be obtained by covering the lens cap), use the image sensor to obtain a monochrome black image, and then select the standard If the absolut...

AI Technical Summary

Problems solved by technology

However, for pixels between black and white, such as gray bad pixels, the difference between the pixel value and the black reference pixel value is small, and the difference between the white reference pixel value is also small, so it may be possible during the detection process. It will be judged as a normal point, and a missed detection will occur

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