关键词: 图像增强, 直方图均衡化, 增强高通滤波, 小波融合

Abstract: This paper studies medical mammogram image special structure charateristic and density characteristic.A single enhancement method has a shortcoming which cause local and details enhance insufficient.This paper adopts histogram equalization method and enhanced high-pass filtering method to enhance respectively mammogram image，and then synthesizes their information by using wavelet method.It is proved that this method gives a better vision，the experimental demonstrates this method effective.

Key words: image enhancement, histogram equalization, enhanced highpass filtering, wavelet fusion