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?

Question

Surya Gnyawali 2015-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/218551-hi-can-anybody-help-me-why-adjcontrast-function-doesn-t-work-is-there-an-alternative-to-adjust-co

编辑： Walter Roberson 2015-5-25

采纳的回答： Image Analyst

在 MATLAB Online 中打开

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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Answer 1

Image Analyst 2015-5-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/218551-hi-can-anybody-help-me-why-adjcontrast-function-doesn-t-work-is-there-an-alternative-to-adjust-co#answer_180356

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().