拉普拉斯滤波器laplacian
function h = laplacian_fspecial(type,p2)if nargin < 2
type = 'laplacian';
p2 = 1/5; % alpha
end
switch type
case 'laplacian'% laplacian filter
alpha = p2;
alpha = max(0,min(alpha,1));
h1 = alpha/(alpha+1);
h2 = (1-alpha)/(alpha+1);
h = [h1 h2 h1;
h2 -4/(alpha+1) h2;
h1 h2 h1];
end
end
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