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DSP Code Sharing > Image denoising - Threshold calculation for Bishrink method
Image denoising - Threshold calculation for Bishrink method
Language: Matlab
Processor: Not Relevant
Submitted by Senthilkumar R on Jul 30 2011
Licensed under a Creative Commons Attribution 3.0 Unported License
Image denoising - Threshold calculation for Bishrink method
This function used to calculate the threshold for image denoising using bishrink method
function T = bishrink2(CD,CY)
sigman = (median(median(abs(CD))))/0.6745;
[m,n] = size(CY);
sigmay = 0;
for i =1:m
for j = 1:n
sigmay = sigmay+((CY(i,j))^2);
end
end
sigmay = sqrt(2)*sigmay/(m*n);
sigma = sqrt(max((((sigmay))-((sigman)^2)),0)); % Variance calculation
if sigma~=0
T = sqrt(3)*(sigman^2)/sigma; %Threshold
else
T = max(max(abs(CY)));
end
sigman = (median(median(abs(CD))))/0.6745;
[m,n] = size(CY);
sigmay = 0;
for i =1:m
for j = 1:n
sigmay = sigmay+((CY(i,j))^2);
end
end
sigmay = sqrt(2)*sigmay/(m*n);
sigma = sqrt(max((((sigmay))-((sigman)^2)),0)); % Variance calculation
if sigma~=0
T = sqrt(3)*(sigman^2)/sigma; %Threshold
else
T = max(max(abs(CY)));
end
posted by Senthilkumar R Comments
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