Secondly , on the adjustment of color , the processing from rgb color space to hsi color space can strengthen the information structure , and reduce the loss of color information . then , in hsi space , the method based on adaptive histogram equalization ( ahe ) is introduced to adjust the saturation and intensity . and then , the contrast is regulated further 第二,在色彩调整方面,将图像从rgb空间转换到hsi空间中进行处理,这样使得图像的信息结构更加紧凑,并减少了颜色信息的丢失;在hsi空间中,采用自适应直方图均衡( ahe )方法实现了图像饱和度和亮度的调整,并进一步修正了图像的对比度。