1.图像反转　　2.灰度线性变换 3.非线性变换 4.直方图均衡化 5. 线性平滑滤波器　　6.中值滤波器　　7.用Sobel算子和拉普拉斯对图像锐化：8.梯度算子检测边缘　　9.LOG算子检测边缘　　10.Canny算子检测边缘 11.边界跟踪 （bwtraceboundary函数）12.Hough变换　　13.直方图阈值法 14. 自动阈值法：Otsu法 15.膨胀操作　　16.腐蚀操作　　17.开启和闭合操作　　18.开启和闭合组合操作 19.形态学边界提取 20.形态学骨架提取 21.直接提取四个顶点坐标 22.文件打开窗口(1. image reversal 2. gray linear transform 3. nonlinear transform 4. histogram equalization 5. linear smoothing filter 6. median filter 7. image sharpening on Sobel edge detection operator and Laplasse: 8. gradient edge detection operator 9.LOG edge detection operator 10.Canny operator 11. boundary tracking (bwtraceboundary function) 12.Hough transform 13. histogram thresholding method 14. threshold method: Otsu method the 15. expansion operation 16. corrosion operation 17. opening and closing operation of the 18. opening and closing combination operation 19. morphological edge extraction 20. morphological skeleton extraction 21. direct extraction of four vertex coordinates 22. file open window)