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function [normim, mask, maskind] = attemptridgesegment(im, blksze, thresh)
im = normalize(im,0,1);
fun = @(block_struct)std2(block_struct.data) * ones(size(block_struct.data));
stddevim = blockproc(im, [blksze blksze], fun);
mask = stddevim > thresh;
maskind = find(mask);
im = im - mean(im(maskind));
normim = im/std(im(maskind));
function[n] = normalize(f, reqmean, reqvar)
if (nargin == 1)
if ndims(f)==2
if ~isa(f,'double')
f = double(f); end
n = f - min(f(:));
n = n/max(n(:));
end
end
if (nargin ==3)
f = double(f);
f = f - mean(f(:));
f = f/std(f(:));
n = reqmean + f*sqrt(reqvar);
end
댓글 수: 1
Walter Roberson
2012년 3월 1일
I don't see any good reason for the multiplication by ones() -- that just replicates the data, which isn't going to change the mean since everything is going to be replicated the same number of times. I suppose it would make a difference to the standard deviation, but my instinct is that you are worsening your std with the replication.
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