histogram 的显示以及调整，包括线性变换，直方图均衡，直方图匹配-adjust histogram including liner transform ， histogram equlazation

能够打开图像文件绘制其直方图，并且实现各种处理 如 线性点运算，灰度拉伸，直方图均衡，直方图匹配等 笔者已经调通！-Be able to open the image file to draw its histogram, and achieve a variety of treatments such as linear point operations, gray stretch, histogram equalization, histogram matching。