Hi can anybody help me why adjcontrast() function doesn't work? Is there an alternative to adjust contrast? Could you please help me denoise the image?

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Surya Gnyawali
Surya Gnyawali 2015-5-25
编辑： Walter Roberson 2015-5-25
I need to enhance a perfusion image to see the blood vessels in Laser Speckle Imaging.
Tried regionprops(), medfilt2(), imdilate(). finally I tried this code
newim = adjcontrast(im1, gain, cutoff);
if isa(im1,'uint8');
newim = double(im1);
else
newim = im1;
end
% rescale range 0-1
newim = newim-min(min(newim));
newim = newim./max(max(newim));
newim = 1./(1 + exp(gain*(cutoff-newim))); % Apply Sigmoid function
figure, imshow(newim);
The outcome is "Undefined function or variable 'adjcontrast'."
Thank you so much in advance
Surya

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Image Analyst
Image Analyst 2015-5-25
You need to find the function adjcontrast() and make sure it's in the current folder or elsewhere on the search path. If you can't find it then maybe you can write your own using imadjust().

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