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

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）

-Image reversal. Grayscale linear transform 3. Nonlinear transformation 4. Histogram equalization 5 linear smoothing filter median filter gradient operator the detected edge 9.LOG operator detection the edge 10.Canny operator edge detection 11. the boundary tracking the (bwtraceboundary function), etc.