Method for removing image color noise, method for removing video color noise and related devices

Abstract

The embodiment of the invention discloses a method for removing image color noise, a method for removing video color noise and related devices. The method for removing image color noise comprises thefollowing steps: acquiring an ambient light brightness value when an image is shot; when the ambient light brightness value is smaller than a preset threshold value, guiding and filtering the chrominance value of the target pixel point according to the ambient light brightness value and the brightness value of the filtering window, and obtaining the brightness absolute error sum of the filtering window and the initial chrominance value of the target pixel point; calculating a target chromaticity value of the target pixel point based on the ambient light brightness value, the brightness absolute error sum, the initial chromaticity value and the original chromaticity value; and adjusting the chrominance value of the target pixel point to enable the adjusted chrominance value to be equal to the target chrominance value so as to remove color noise. Since the ambient light brightness value can perform prior estimation on the color noise level of the image, the chrominance loss caused by filtering is reduced, the brightness value of the filtering window is used for filtering, the original chrominance value is used for adjusting the initial chrominance value, and the chrominance of a non-color-noise area is protected while color noise is removed.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of image processing, and in particular, to a method for removing color noise in an image, a method for removing color noise in a video, and related devices. Background technique [0002] In the scene of video shooting or image shooting, the camera will produce obvious blocky color noise in the captured image or video in the scene where the ambient light is relatively dark. On the one hand, it has a negative impact on the video or image encoding and compression process, increasing the cost of data transmission. [0003] In order to obtain an image with better quality, it is necessary to remove the color noise in the image. In the prior art, filtering is usually used to remove the color noise. In order to reduce the impact on the non-noise area in the image based on the filtering denoising algorithm, various edge-preserving filtering algorithms are usually used, such as bilateral filteri...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method for removing color noise in an image, a method for removing color noise in a video, and related devices, so as to solve the problem in the prior art that color distortion is caused to light spots or thin lines with color information while removing color noise

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