Adaptive lens shadow correction method and system based on color temperature and illumination

Abstract

The invention provides a self-adaptive lens shadow correction method based on color temperature and illumination, and the method comprises the steps: S1, obtaining a to-be-corrected original image of a video image, and guaranteeing the brightness of the image to be in the degree of human eye vision; s2, extracting four channels of the to-be-corrected image, including a red channel R, green channels Gr and Gb, and a blue channel B; s3, calculating four channel correction coefficients, including Rgain, of the image; grgain and Gbgain are selected from the group consisting of Grgain and Gbgain; bgain, Bgain; the formula is as follows: R < gain > = R < gain > org * R < stream >; grgain is equal to Grgainorg * Grstream, and Grgain is equal to Grgainorg * Grstream; gbgain is equal to Gbgainorg * Gbstream, and Gbgain is equal to Gbgainorg * Gbstream; bgain is equal to Bgain org * Bstream, and Bgain is equal to Bgain org * Bstream; wherein the Rgain, the Grgain, the Gbgain and the Bgain are respectively corresponding channel correction coefficients; the Rstream, the Grstream, the Gbstream and the Bstream are respectively corresponding correction intensities, and the Rgainorg, the Bgainorg, the Grgainorg and the Gbgainorg are respectively static correction coefficients of corresponding channels; s4, correcting four channels of the image, and performing table look-up and calculation on coefficients of corresponding positions to obtain a formula r = R * Rgain; gr is equal to Gr * Grgain; gb is equal to Gb * Gbgain; b is equal to B * Bgain.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an adaptive lens shadow correction method and system based on color temperature and illuminance. Background technique [0002] At present, in image processing technology, there are many kinds of lens shading correction algorithms. Usually, the correction coefficient tables of different color temperatures are obtained in advance, and then the correction values ​​are calculated by looking up the table for pixels at different positions of the actual image. Among them, lens shading (Lens Shading) is the situation where shadows appear around the lens due to the uneven optical refraction of the lens. The lens shading correction (Lens Shading Correction) is to solve the optical characteristics of the lens, correct the shadow or color unevenness around the lens. Lens shading can be subdivided into luma shading and color shading. Luma shading Due to the optical characteristics ...

AI Technical Summary

Problems solved by technology

2. Solve the boundary effect of the existing method of correction, make the transition of the image area smoother, and enhance the correction effect

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