Method and system for adaptively recursively denoising digital video signal

Abstract

The invention discloses a method and a system for adaptively recursively denoising a digital video signal. Key technology is that: a recursion coefficient k set by a user is corrected to obtain a corrected coefficient k_adj; if an absolute difference value diff_fwd between corresponding pixels in a current image t and a previous image t-1 is more than or equal to the absolute difference value diff_bwd between the corresponding pixels in the current image t and the next image t+1, k_adj is equal to k; if the absolute difference value diff_fwd is less than the absolute difference value diff_bwd, the corrected coefficient k_adj is less than k; and the pixel G (i, j, t) in the current image t is denoised by adopting the corrected coefficient k_adj. In the method and the system, the information of the image t+1 after a current time is introduced to correct the recursion coefficient k. The method and the system provided by the invention can well eliminate the trailing phenomenon, produced by recursive denoising, of a moving object.

Description

technical field [0001] The invention belongs to the field of digital video signal processing, and in particular relates to an adaptive recursive noise reduction method and system for digital video signals. Background technique [0002] Digital video signals, whether they are transmitted in analog or digital mode, need to be de-noised when they are finally displayed on the screen to achieve a smooth and clean display effect. At present, the most commonly used denoising method in digital video signal processing is to perform recursive operations on the input signal on the time axis. For example, if a pixel value on the input video image at time t-1 is G(x, y, t- 1), where x and y represent the position of the pixel in the image G, and the pixel at the same position at time t is G(x, y, t), then perform the following operations on G(x, y, t): [0003] G(x, y, t)=(1-k)*G(x, y, t)+k*G(x, y, t-1) (1) where 0≤k≤1.0, using the newly calculated The G(x, y, t) value replaces the old...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an adaptive recursive noise reduction method and system for digital video signals, so as to solve the difficulty in applying the actual noise reduction process caused by the existing recursive noise reduction method and system relying too much on the accuracy of static judgment classification technical issues

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