图像增强技术主要包括：直方图修改处理，图像平滑处理，图像尖锐化处理，彩色图像处理。从纯技术上讲主要有两类：1）频域处理法 2）空域处理法 -Image enhancement technologies include: histogram modification processing, image smoothing, image sharpening processing, color image processing. From a purely technical sense there are two categories: 1) frequency-domain treatment method 2) airspace treatment method