（1）可以图示地设计GST函数；（2）可以执行点运算；（3）可同时显示输入和输出图像以及它们的直方图-(1) can icon design GST function; (2) can be implemented point arithmetic; (3) can also show the input and output images and their histogram

简单画板：直线，圆，矩形。主要用鼠标在菜单的工具栏的图标框里选择这三种图形！-Simple drawing board: straight lines, circles, rectangles. Main menu with the mouse icon in the toolbar box to select these three graphics!