Error in multithresh while computing N levels

John

2015 3 10

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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, ... ||