关键词: 图像增强, Retinex, Mean Shift, 光晕现象, 颜色保持

Abstract: In this paper a fast Retinex-based color image enhancement method is proposed.Global and local adaptation of the human visual system are simulated.A global dynamic range adjustment is performed first.Then Mean Shift filtering is performed on the original image in the illuminant estimation step，and the spatial-varying illuminant is eliminated base on the center/surround hypothesis.Finally steps of color restoration and post-processing are carried out.Experimental results demonstrate that this method can efficiently reduce halo artifacts and color of the original image is better preserved.An accelerated implementation of Mean Shift is employed.Thus this method is much faster than previous methods.

Key words: image enhancement, Retinex, Mean Shift, halo artifact, color preservation