For this reason, region histogram equalization is advanced in the thesis, this method can improve edge slope and contrast at one time, furthermore, it can restrain noise in smooth regions.

• 为此本文又提出了区域间直方图均衡的增强方法,具有在改变边缘两侧对比度的同时提高边缘的斜率,而且还能抑制平滑区的噪声。