Image purple edge elimination device and method

Abstract

The invention provides an image purple edge elimination device and method, and the device comprises an image obtaining unit which is used for collecting and processing an image signal, so as to obtainimage data in a BAYER format; a preprocessing unit which his used for processing the image data so as to convert the image data into a luminance space and a chrominance space; a purple edge elimination unit which is used for processing the brightness domain and the chrominance domain to obtain purple edge pixel points and corrected image data; a post-processing unit which is used for carrying outimage enhancement processing on the corrected image data image signal; an image output unit which is used for outputting the image data which is subjected to enhancement processing and passes throughthe post-processing unit, wherein the image acquisition unit, the pre-processing unit, the purple edge elimination unit, the post-processing unit and the image output unit are electrically connectedin sequence, so that a purple edge and a purple object can be better distinguished and the purple edge can be completely eliminated when purple edges with different brightness and widths appear in different lenses and complex environments.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image purple fringe elimination device and method. Background technique [0002] The purple fringing phenomenon is the dispersion that tends to appear at the junction of the high-light area and the low-light area due to the large brightness contrast of the scene being photographed during the process of taking pictures with a digital camera. The appearance of purple fringing is related to the dispersion of the camera lens, the small imaging area of ​​the CCD, and the signal processing algorithm inside the camera. Even high-end digital cameras cannot completely solve the problem of purple fringing. [0003] The industry usually avoids the appearance of purple fringing when taking pictures by changing the hardware structure of the camera or lens to achieve the purpose of eliminating the purple fringing of the image. This method of changing the hardware structure is costly and the ...

AI Technical Summary

Problems solved by technology

The appearance of purple fringing is related to the dispersion of the camera lens, the small imaging area of ​​the CCD, and the signal processing algorithm inside the camera. Even high-end digital cameras cannot completely solve the problem of purple fringing.

[0003] The industry usually avoids the appearance of purple fringing when taking pictures by changing the hardware structure of the camera or lens, so as to achieve the purpose of eliminating the purple fringing of the image. This method of changing the hardware structure is costly and the development cycle is long.

At the same time, due to the advantages and disadvantages of the lens and the complex environment to deal with, the purple fringing of the image shows different brightness and width, that is, it may appear in non-high-light high-contrast areas, or the purple fringing is very thick and spreads multiple pixels.

The existing purple fringing methods have difficulties in distinguishing between purple fringing and purple objects, and in completely eliminating purple fringing, that is, the color of purple objects may be eliminated, or the purple fringing is not clean, and the transition is unnatural

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