Improvement of enhancement algorithm for aerial image
Zhang Ye · Laser & Infrared · 2012
The traditional Partially Overlapped Sub-block Histogram Equalization may cause over enhancement and block effect to the sky region image with slow gray gradient,which degrades the quality of the image seriously.To solve this problem,this article will improve the algorithm by separating the sky region with slow gray gradient from the image,and then deal the separated aerial aera with the Overall Histogram Equalization while disposing the remainder aera with Partially Overlapped Sub-block Histogram Equalization.Experiment results with Matlab reveal that the algorithm proposed in the article can not only enhance the contrast of the image but also improve the information in both overall image and partial image.It can also avert over-enhancement and repress noise simultaneously,which highly improves the quality and visual effect of the image.