机载CCD数字图像的增强

在强光或逆光条件下,高空中拍摄的图像对比度较低,画质不清晰,不易提取有效信息.经大量试验证明,直方图均衡算法可以解决以上问题,但效果并非最佳.作用亮度变换算法,能更好地处理机载图片.但增强算法只能处理灰度图像,故对于彩色图像须引入彩色空间转换的概念.给出了直方图均衡化算法和亮度变换算法的原理,以及彩色空间转换概念和在Matlab中的试验结果.

Enhancement of airborne CCD digital images

Images taken at high altitude may have low contrast and poor definition when the light is very bright or comes from the backward.It is not easy to obtain information from these images.Great number of experiments indicated that histogram equipoise algorithm can solve this problem,but the effect is not so good.A new brightness transformation algorithm is put forward here,which can make better processing for airborne images.But this algorithm can only be applied for gray image.For the color image,the concept of color space conversion should be introduced.The experimental results obtained in Matlab are presented in the end.