Error in multithresh while computing N levels

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John
John 2015-3-10
编辑： Walter Roberson 2016-6-9
I'm trying to compute the metrics of an image using multithresh for for N levels 2:20 (maximum allowed). In some of the images I get an error in the loop (see error below) especially at level N(j)=3. I'm not sure why I get this error with some images and not all. Please help.
[~, metric(j)] = multithresh(ROI, N(j) );
Attempted to access omega(-2); index must be a positive integer or logical.
Error in multithresh>objCriteriaND (line 264)
sigma_b_squared_val = omega(boundaries(1)).*((mu(boundaries(1))./omega(boundaries(1)) - mu_t).^2);
Error in multithresh>@(thresh)objCriteriaND(thresh,num_bins,omega,mu,mu_t) (line 148)
[thresh, minval] = fminsearch(@(thresh) objCriteriaND(thresh, ...
Error in fminsearch (line 309)
x(:) = xr; fxr = funfcn(x,varargin{:});
Error in multithresh (line 148)
[thresh, minval] = fminsearch(@(thresh) objCriteriaND(thresh, ... ||
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SuSo
SuSo 2015-8-6
Lol that's exactly what I did. Pity. Thanks!
SarTho
SarTho 2016-6-9
I faced the same problem with multithresh und solved it by just applying some light preprocessing filter (gauss etc) on the input.

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