介绍了修正Retinex照射反射模型的彩色图像增强方法, 引入了非线性变换函数修正彩色图像的照射分量和反射分量。由于全局对比度增强函数能够拉伸图像的照射分量, 所以改善了全局视觉效果。非线性S型函数对较大和较小的反射分量值改变较小, 对中间值改变较大, 从而改善了图像的局部对比度。在RGB彩色空间和其他色度亮度彩色空间中的处理结果都没有出现彩色失真的现象。

Color image enhancement of modified Retinex illumination-reflection model is proposed. And nonlinear transformation functions are introduced to modify illumination and reflection components of color image. Global contrast enhancement function can stretch illumination component, so whole visual appearance is improved. Nonlinear sigmoid function changes little for higher and lower of reflection component value, and more for median of reflection. Finally local contrast of image is enhanced. The method has not cause color distortion for RGB and other chroma-luminant color space.