Lens shadow correction method and device, medium and terminal

Abstract

The invention provides a lens shadow correction method and device, a medium and a terminal. The method can be applied to a camera shooting terminal, and comprises the steps: collecting an original image, determining a lens shadow compensation coefficient table of the original image, carrying out the interpolation of the lens shadow compensation coefficient table, and calculating the initial lens shadow compensation coefficient of a pixel point in the original image, determining an original image as a highlight image according to brightness information of the original image, adjusting an initial lens shadow compensation coefficient of a pixel point in the highlight image according to the brightness information of the highlight image to obtain a target lens shadow compensation coefficient of the pixel point, and finally collecting a target lens shadow compensation coefficient of the pixel point according to the target lens shadow compensation coefficient of the pixel point, and correcting the lens shadow of the highlight image. According to the method, the highlight image is confirmed and adaptively adjusted, so that the loss of detail information after the highlight area is corrected is avoided, and the image quality after lens shadow correction is improved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method, device, medium and terminal for correcting lens shading. Background technique [0002] The optical characteristics of the lens are that the center of the lens is more sensitive to light than the periphery, and the amount of light passing through the lens gradually decreases from the center to the periphery of the lens, resulting in a phenomenon where the center of the image is bright and the periphery is dark. At the same time, due to the different refractive indices of the lens for different wavelengths of light and the different refraction angles of the lens for different positions, the captured image will also have a peripheral color cast. [0003] The above two phenomena are collectively referred to as lens shading. Lens shading will reduce image quality. In order to improve image quality, lens shading correction (LSC) technology is usually used to ...

AI Technical Summary

Problems solved by technology

However, in some scenes where the original image contains high-brightness areas or high-dynamic areas, when performing shading compensation on the original image to eliminate lens shadows, the edge and detail information of the high-brightness area may be lost due to over-correction in the high-brightness area. Or overexposure phenomenon, resulting in low image quality

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