LOW-LIGHT-LEVEL IMAGE ENHANCEMENT METHOD AND APPARATUS BASED ON RETINEX

摘要

Disclosed are a low-light-level image enhancement method and apparatus based on Retinex, belonging to the technical field of image processing. The method comprises: selecting, from an original color image, the minimum value in three channels of R, G and B of each pixel point, and storing a channel where the minimum pixel value is located, so as to obtain a minimum pixel value image and a minimum channel table (S102); carrying out multi-scale Retinex processing on the minimum pixel value image to obtain a Retinex-processed image (S104); and calculating, according to the Retinex-processed image, the minimum channel table and the proportion of each component of each pixel point, processed values of the other two channels, other than the minimum pixel value, in each pixel point of the original image, so as to obtain an enhanced color image (S106). The method can improve an enhancement effect in a relatively dark area of the image, thereby improving the image quality; in addition, the amount of calculation is greatly reduced, thereby improving the processing efficiency.