摘要
直方图均衡技术是图像增强实用且有效的方法之一 .由于人的视觉对图像亮度呈近似的对数或立方根响应 ,利用常规直方图均衡处理后的图像在高灰度区会有过亮现象 ,提出了一种新的直方图不完全均衡化处理方法 :在低灰度区进行常规的均衡化处理 ,在高灰度区按与人眼响应规律相逆的规律做向下衰减的灰度变换处理 ;引入不完全均衡化高灰度区阈值rδ 概念 ,导出rδ 的最佳值计算公式 ;
Amending histogram is one of the practical a nd effective methods for imag e enhancement. Because the vision of man responds to the logarithm or the cube r oot of image lightness approximately, over-bright phenomenon appears in the hig h gray area of the image treated by traditional histogram equalization. A new met hod of histogram equalization named histogram incomplete equalizati on is presented to accomplish the traditional histogram equalization treatment in the low gray area and achieve gray transform according to the reciprocal orderlines s with the vision of man in the high gray area of image processing. A concept of the high gray area threshold r δ for histogram incomplete equ alization is introduced and the calculation formula of its optimal value is de rived. This method can also compen sate the over-bright phenomenon in high gray area of the image treated by the general histogram equalization effectively.
出处
《山东大学学报（工学版）》
CAS
2003年第6期661-664,共4页
Journal of Shandong University（Engineering Science）
基金
山东省自然科学基金资助项目 (Y2 0 0 0C2 6 )
关键词
图像增强
不完全均衡
直方图
image enhancement
incomplete equalization
histogra m
