摘要
直方图均衡已经广泛应用于图像增强,但是直方图均衡也存在一些明显的缺点:首先,直方图均衡后会使得图像的均值接近于灰度级的中点;其次,直方图均衡后会使得一部分灰度级被拉伸,另一部分灰度级被简并,表现为图像的过增强出现不自然的表象。在这篇文章中,使用方法是非线性直方图均衡,即提出了保持背景亮度的直方图均衡(BBPHE),不仅提高图像对比,还保留背景亮度。
Histogram equalisation (HE) is widely used to enhance the image but it tends to over-enhance the image background brightness.Improvement schemes have been introduced to reduce this defect of the conventional HE, but the over-enhancement of the background brightness is obvious. A novel approach of nonlinear HE is presented,which is able to enhance the image contrast while preserving the background brightness for images with wel-defined background brightness.
出处
《电子制作》
2015年第2Z期60-61,共2页
Practical Electronics
关键词
图像增强
直方图均衡
背景亮度保持
Image enhancement,histogram equalisation,Preserving background brightness
