直方图是多种空间域处理技术的基础。直方图操作能有效地用于图像增强。这个代码是我根据课本写的，整理了一下教案，教案里有详细原理和实验里有详细步骤。辛苦了好长时间的东西啊，没功劳也有苦劳啊！-Histograms are a variety of spatial domain processing technology foundation. Histogram operation can be effectively applied to image enhancement. This code is written by me in accordance with textbooks, then organize lesson plans, lesson plans in principle and there is a detailed experiment has the detailed steps. A good long hard things ah, no credit also has elbow grease ah!