A Method to Eliminate Image Purple Fringing

Abstract

The invention discloses a method for eliminating purple fringing in an image, comprising: obtaining a color image to be corrected containing purple fringe; searching for a purple region in the color image to be corrected, and obtaining the position information of the purple region; converting the color image to be corrected Convert it into a grayscale image, find the defined near-saturated region at the position corresponding to the purple region in the grayscale image, and obtain the position information of the near-saturated region; find the edge region at the position corresponding to the purple region in the grayscale image, and obtain the edge region The position information of the purple fringing area, the near-saturated area, and the edge area are combined and processed to obtain the final purple fringing position information; the final purple fringing position information is mapped to the color image to be corrected, and the final purple fringing The purple area represented by the position is corrected. The invention can accurately correct the purple area, thereby effectively eliminating the purple fringe phenomenon in the image.

Description

technical field [0001] The present invention relates to image processing technology, and more specifically, relates to a method for eliminating purple fringing of an image. Background technique [0002] Image purple fringing refers to the phenomenon of purple color spots appearing at the junction of high-light and low-light parts due to the large contrast of the subject during the shooting process of a digital camera. Its diffraction with light, dispersion of the camera lens and image Sensor color interpolation algorithm and so on. Image purple fringing did not exist in the era of film cameras, it is an inherent problem of digital cameras, even high-end digital cameras cannot completely avoid image purple fringing. [0003] High-end digital cameras generally use high-quality lenses to reduce chromatic aberration, but this method is expensive and cannot completely solve the problem of purple fringing in images, and generally requires a purple fringing correction algorithm. ...

AI Technical Summary

Problems solved by technology

Image purple fringing did not exist in the era of film cameras, it is an inherent problem of digital cameras, even high-end digital cameras cannot completely avoid image purple fringing

[0003] High-end digital cameras generally use high-quality lenses to reduce chromatic aberration, but this method is expensive and cannot completely solve the problem of image purple fringing, and generally needs to cooperate with purple fringing correction algorithms

The effect of the purple fringing correction algorithm that comes with the camera is also unsatisfactory. This is mainly because the algorithm cannot accurately distinguish the purple fringing area due to the complexity of the environment, or the wrong area is misjudged as the purple fringing area, resulting in wrong corrections.

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