Moiré Elimination Method of Screen Capture Image Based on Multi-channel Decomposition

Abstract

The invention belongs to the field of digital image processing, and aims to provide a method for eliminating moiré patterns in screen shots that do not exist in the prior art, so as to realize the elimination of moiré patterns in screen shot images. The technical solution adopted by the present invention is to provide a multi-phase layer decomposition model based on the multi-channel decomposition method for eliminating moiré in screen-shot images, and use the model in the Y channel to realize the desalination of moiré color stripes and high-frequency parts ; Input the obtained results into an improved Laplacian filter to further eliminate the color fringes; finally, apply the multi-phase decomposition layer model to the RGB channels of the results obtained in the previous step to obtain the final result. The invention is mainly applied to digital image processing occasions.

Description

technical field [0001] The invention belongs to the field of digital image processing, and in particular relates to an algorithm for eliminating moiré in screen-shot images based on multi-channel decomposition. Background technique [0002] Moiré is a common visual phenomenon. When shooting some relatively dense objects, such as: architectural decorations, textiles, screens, etc., or scanning printed materials through a scanner, large areas of color and irregular patterns will appear. Streaks, that is, moiré phenomenon. However, the appearance of the moiré phenomenon seriously affects the image quality, so eliminating the moiré in the image is a widely concerned issue. [0003] The existing methods for eliminating moiré are mainly aimed at the moiré on textiles and scanned images. These methods fall into two main categories. First of all, the first category is "preprocessing", as the name implies, it is to process the camera before taking the image. Place an optical low-...

AI Technical Summary

Problems solved by technology

The difficulty of eliminating screen-shot moiré lies in: 1) The moiré pattern of color stripes is at a lower frequency position, and has a high similarity with the background information of the image, and it is difficult to distinguish between the two; 2) Because the stripes on the screen-shot image The distribution is not regular, and it is difficult to find its characteristics to eliminate moiré; 3) The high-frequency part of moiré is very similar to the frequency of image details, so although a simple low-pass filter can eliminate high-frequency moiré, But the image details will also be smoothed out, and the final result will be too smooth

At present, Photoshop has a better effect on eliminating moiré in screen shots, but so far there is still no more efficient algorithm for eliminating moiré in screen shots, which ensures that moiré is eliminated and image details are preserved.

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