1、图像中值滤波实验

①用imnoise函数在图像’lena.bmp’中值添加椒盐噪声，观测结果

②用medfilt2函数对含噪声图像中值滤波。

2、使用fspecial函数生成均值、Prewitt、Sobel、Laplacian滤波模板，再用filter2函数对‘cameraman.tif’图像进行空域滤波，显示滤波结果。

3、设计高斯低通和高通频域滤波器，对‘phantom.bmp’图像进行频域滤波，显示滤波结果。然后改变滤波器截止频率，观察对结果的影响。

4、用imdilate, imerode, imopen, imclose函数对‘326.bmp’进行膨胀，腐蚀，开启，闭合运算。（结构单元均取3*3矩形模板）。-1, image filtering experiment ① with imnoise function adds salt and pepper noise image ' lena.bmp'　in value, with observations ② medfilt2 function noisy image filtering. 2, using the function generation fspecial mean, Prewitt, Sobel, Laplacian filter template, and then filter2 function ' cameraman.tif'　image spatial filtering, display filtering results. 3, the design of Gaussian low-pass and high-pass filter in the frequency domain, for ' phantom.bmp'　image frequency domain filtering, filtering results show. Then change the filter cutoff frequency, observe the effect on the results. 4, with imdilate, imerode, imopen, imclose function ' 326.bmp'　is expanded, erosion, opening and closing operations. (Structural units were taken 3* 3 rectangle template).