Screen photography image moire removing method based on multichannel decomposition

Abstract

The invention belongs to the field of digital image processing. The technical purpose is to solve the problem in the prior art that a method for removing the screen photography moire does not exist, and remove the moire pattern in a screen photography image. According to the technical scheme, the method comprises the steps of providing a multiphase coverage decomposition model, and applying the model to a Y channel to achieve fading of the color strips and the high-frequency part of the moire; inputting the obtained result to an improved Laplace filter to further remove the color strips; finally, applying the multiphase coverage decomposition models respectively in RGB channels of the model for the result obtained in the last step to obtain a final result. The method 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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