在RGB空间中分别对真彩图像的3个通道进行增强能够很好压缩图像动态范围,但往往会产生色彩偏离。提出先将真彩图像由RGB空间变换到YCbCr空间,进行色彩和亮度分离,然后对亮度通道进行多尺度高斯同态滤波增强。实验证实,增强后的真彩图像色彩无偏差,图像动态范围压缩良好。
Image enhancement provides good dynamic range compression in each red,green,and blue(RGB) channel of real-color image,but it fails in color rendition.In this letter,we propose to transform a real-color image from RGB space to YCbCr space at first.Then luminance channel(Y) is enhanced by multi-scale Gaussian high-pass homomorphic filter.Experiments show the compression of real-color image dynamic range is obviously effective,and it success in color rendition.