Method for acquiring bad point detection image of image sensor and device thereof

Abstract

The invention relates to the field of electronic circuits and discloses a method for acquiring a bad point detection image of an image sensor and a device thereof. In the method and the device, the exposure degree of an image is controlled by utilizing exposure configuration parameters; because bright bad points, dark bad points or inconsistent points have different light ray sensitivity degrees from that of a peripheral light sensitive source, the differences between the points and the points around become more remarkable when the bright and dark degrees of the image is controlled by adopting an exposure method; therefore, the inconsistent points are easier to be detected. In other words, the image sensor bad points, with different damage degrees and different colors, of an acquired image of are effectively highlighted; the stability and the reliability of bad point detection are improved; and the detection leakage of the bad points is reduced. Moreover, the method can be implemented almost needing no preparation.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a dead point detection technology of an image sensor. Background technique [0002] With the development of society and the advancement of technology, digital video and image products are increasingly inseparable from intelligent transportation, and the quality of image sensors has a crucial impact on the quality of video products and images. Due to differences in semiconductor manufacturing processes and raw materials, there are usually more or less dead spots in Charge-Coupled Devices (CCD) or Complementary Metal Oxide Semiconductors (CMOS); these dead spots may be Bright dead pixels may also be dark dead pixels. The reason is that the sensitive light source of the dead pixels may be short-circuited with the power supply or ground wire, so they are not sensitive to the light of the surrounding environment. [0003] But in the actual situation, there is another kind of dead p...

AI Technical Summary

Problems solved by technology

It is difficult to detect effectively by direct threshold judgment, and it is easy to misdetect noise when the detection threshold is lowered

Pointing the image sensor to multiple monochrome panels of different colors to collect corresponding monochrome images, and analyzing dead pixels in each monochrome image can improve the completeness of dead point detection to a certain extent, but it cannot really effectively detect Inconsistencies, while shooting for different color palettes will be affected by more external environmental lighting and other factors, so the requirements for the environment are higher, and the dead point detection is easily interfered

[0006] In addition, if it is necessary to detect dead pixels on panels of different colors, in addition to considering a method to effectively control environmental lighting and other influencing factors, it is also necessary to prepare a suitable color panel and have a certain impact on the surface cleanliness of the color panel. Very strict requirements, no stains, otherwise it will affect the effect of dead point detection, so the operation is also extremely unchanged, which will affect the efficiency of dead point detection

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