Method and device for eliminating light leak phenomenon in picture

Abstract

The application discloses a method and a device for eliminating a light leak phenomenon in a picture. The method for eliminating the light leak phenomenon in the picture includes steps: using rough positioning to obtain a start column and an end column of a light leak region in a dark pixel region, and using the start column, the end column and picture elements between the start column and the end column as an undetermined light leak region. When the light leak region shakes, the undetermined light leak region and the periphery of the undetermined light leak regions are likely to be the light leak region. Under the circumstance, the method and the device for eliminating the light leak phenomenon in the picture regulate gray levels of the undetermined light leak region and picture elements on the periphery of the undetermined light leak region according to a gray level correlation of the picture elements in the undetermined light leak region and the picture elements on the periphery of the undetermined light leak region, and thereby can restore the light leak region which shakes, and eliminate the light leak phenomenon. Furthermore, due to the fact that the gray levels of the undetermined light leak region and the picture elements on the periphery of the undetermined light leak region are regulated according to the gray level correlation among the picture elements in the picture during the light leak phenomenon eliminating process, the problem that quality of the picture is influenced due to the fact that picture element gray level change in the picture is overlarge can not occur.

Description

technical field [0001] The present disclosure relates to the field of image processing, in particular to a method and device for eliminating light leakage in an image. Background technique [0002] Photo shooting technology can retain instant images and is widely used in people's life and work. However, light leakage (smear) sometimes occurs during image capture. The phenomenon of light leakage, also known as the phenomenon of dispersion, refers to the phenomenon that when the camera shoots the scene under the strong point light source, due to light scattering, a striped light image is formed on the captured picture. Wherein, the striped light image is generally called a light leakage area. see figure 1 The schematic diagram of a normal image output by the image sensor is shown. In this figure, the black pixel area is a dark pixel area, and the gray pixel area between the black pixel areas is a normal area, wherein the dark pixel area is a non-photosensitive part of the s...

AI Technical Summary

Problems solved by technology

[0004] However, the inventor found in the research process that when the picture generation device takes pictures, it often shakes slightly, causing the light leakage areas in the picture to shake slightly, so that the light leakage areas in the whole picture are not in the same column, forming a pattern such as image 3 picture shown

In this case, if the existing technology is used to eliminate the light leakage phenomenon, the light leakage phenomenon in the second light leakage area that is not in the same column as the first light leakage area cannot be eliminated, and the normal light leakage area in the same column as the first light leakage area Pixels in the effective information collection area will have offset errors, resulting in a reduction in the grayscale of pixels without light leakage in the column, resulting in deterioration of image quality

Therefore, the existing technology is often unable to eliminate the light leakage phenomenon in the entire picture, and affects the normal effective information collection area, reducing the picture quality

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