Three-dimensional lookup table-based image color correction method and device

Abstract

The invention discloses a three-dimensional lookup table-based image color correction method. The method comprises the steps that: S1, an image is collected, and an RGB domain image is generated; S2,a first-level lookup table is established by utilizing a standard color card image and a test color card image, and a first-level interpolation color card image is generated; S3, interpolation is performed on the image obtained in the step S1 by using the first-level lookup table to obtain a first-level interpolation image; S4, weighted fusion is performed on the first-level interpolation image and the image obtained in the step S1 to obtain a first-level color correction result, and weighted fusion is performed on the first-level interpolation color card image and the test color card image toobtain a first-level color card correction result; S5, a multi-stage lookup table is established according to the previous-level lookup table, a test color card, a previous-level interpolation colorcard image or a previous-level color card correction result, and the standard color card image; S6, interpolation is performed with the multi-stage lookup table and a previous-level color correction result to obtain a current-level interpolation result; and S7, weighted fusion is performed on the current-level interpolation result and the previous-level color correction result.

Description

technical field [0001] The invention relates to the technical field of video image processing, in particular to an image color correction method and device based on a three-dimensional lookup table. Background technique [0002] The currently commonly used image color correction method based on a lookup table mainly utilizes a lookup table, and uses various interpolation algorithms for color images to achieve the purpose of image color correction. The three-dimensional lookup table is used in high dynamic range video (HDR) for color correction. The Chinese patent application with the publication number CN106408540A uses a three-dimensional lookup table to provide an interpolation method when two or more RGB values ​​of the color to be interpolated overflow. However, the above-mentioned patents all focus on using the lookup table to interpolate the image to be processed to achieve color correction, and do not specifically mention how to establish a high-precision lookup table...

AI Technical Summary

Problems solved by technology

[0002] The currently commonly used image color correction method based on a lookup table mainly uses a lookup table to use various interpolation algorithms for color images to achieve the purpose of image color correction. For example, the Chinese patent application with publication number CN108141507A realizes the The three-dimensional lookup table is used in high dynamic range video (HDR) for color correction. The Chinese patent application with the publication number CN106408540A uses a three-dimensional lookup table to provide an interpolation method when two or more RGB values ​​of the color to be interpolated overflow. However, the above-mentioned patents all focus on using the lookup table to interpolate the image to be processed to achieve color correction, and do not specifically mention how to establish a high-precision lookup table

[0003] For the establishment of the lookup table, the Chinese patent application with the publication number CN107077828A provides a lookup table compression method, which converts the color to other spaces, uses N two-dimensional lookup tables to replace the three-dimensional lookup tables and realizes its functions, but it does not It mentions how to generate a three-dimensional lookup table, and does not involve image color correction based on a three-dimensional lookup table

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