img=imread（‘lena.jpg‘）;??%對圖像進行銳化
[mn]=size（img）;
img=rgb2gray（img）;
img=double（img）;
figure;
imshow（uint8（img））;
imwrite（uint8（img）‘leanunsharpe.jpg‘）;
sigma=1;
gausFilter=fspecial（‘g