Defective pixel detection and correction method and device, storage medium and terminal

Abstract

The invention discloses a defective pixel detection and correction method and device, a storage medium and a terminal, and the method comprises the steps: moving a sliding window pixel by pixel in a to-be-detected image, and calculating the detail density corresponding to a central pixel through the pixel value of each pixel in the sliding window; after the sliding window is moved, determining a defective pixel threshold coefficient corresponding to the central pixel at least according to the detail density corresponding to the central pixel; after the sliding window is moved, dividing the sliding window into a plurality of sub-windows, calculating a defective pixel threshold range corresponding to each sub-window according to the pixel value in each sub-window and the defective pixel threshold coefficient corresponding to the central pixel, and comparing whether the pixel value of the central pixel falls into the defective pixel threshold range corresponding to each sub-window or not;and after the sliding window is moved, determining whether the central pixel is a defective pixel or not according to a comparison result of the central pixel and the defective pixel threshold rangecorresponding to each sub-window until the to-be-detected image is traversed. According to the technical scheme, the accuracy of defective pixel detection can be realized.

Description

technical field [0001] The present invention relates to the technical field of image processing, and in particular to a dead point detection and correction method and device, a storage medium, and a terminal. Background technique [0002] Image sensors often have dead pixels, resulting in images that are either too bright or too dark. Dead pixels can be divided into two categories. The first type is a complete white point or black point. The position coordinates and pixel values ​​do not change with time or the intensity of the light falling on it. This kind of dead point can be solved by static dead point correction technology. Type 2 bad pixels have pixel values ​​that vary with the amount of light falling on them, but have a significantly different gain than most others; or work fine with one camera setting and not others ; or it works normally when the light is sufficient, but it does not work normally under low light; or it works normally under normal temperature, but...

AI Technical Summary

Problems solved by technology

Type 2 bad pixels have pixel values ​​that vary with the amount of light falling on them, but have a significantly different gain than most others; or work fine with one camera setting and not others ; or it works normally when the light is sufficient, but it does not work normally under low light; or it works normally under normal temperature, but it does not work normally under high temperature;

[0004] However, the existing dead pixel correction methods usually have a large loss of details

For example, the applicant Altek (patent No. US7589770B2) proposed a method patent for correcting dead pixels in a matrix with a size of 3 pixels × 3 pixels. Although the dead pixels can be effectively corrected, it is easy to cause loss of details.

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