关键词: 人脸图像, 图像增强, Retinex理论, 肤色模型

Abstract: A method based on single-scale Retinex and skin color model is proposed for distortion of skin color in non-uniform illumination face image enhancement. The face image is converted to YCbCr color space, and the intensity and color components are enhanced by different methods. First, in order to compress the dynamic range of face image and enhance the details of shadow areas, the method based on single scale Retinex is applied on the intensity component images. Then, to improve the color quality of skin region, the value of chrominance components（Cb and Cr）of skin pixels are adjusted according to the aggregation characteristics of skin color in CbCr space. Experiments in the CAS-PEAL face database show that the proposed method can improve the image details and color quality of the facial region.

Key words: face image, image enhancement, Retinex theory, skin model