myhighpass.m

该压缩包中的程序实现对图像的平滑和锐化

function phighpass=myhighpass(pmat)
%高通滤波进行锐化
[row col]=size(pmat);   %原始图像的大小
%对图像进行零填充
pfilled=zeros(row+2,col+2);
pfilled(2:row+1,2:col+1)=pmat;
%定义模板
H=[-1 -1 -1;-1 8 -1;-1 -1 -1];
%计算输出图像各点的灰度值
phighpass=zeros(row,col);
for i=1:row
    for j=1:col
        array=[pfilled(i,j) pfilled(i,j+1) pfilled(i,j+2);pfilled(i+1,j) pfilled(i+1,j+1) pfilled(i+1,j+2);pfilled(i+2,j) pfilled(i+2,j+2) pfilled(i+2,j+2)];
        phighpass(i,j)=sum(sum(H.*array));
    end
end
phighpass=uint8(phighpass);