MATLAB: Contrast equalization with imadjust

contrastequalizationimadjust()

I'm supposed to create a funcion with the following parameters: myEqualization(input_image, method, threshold) Where "method" is a number from 1 to 8 that represent one of these equalizations. The thing is that I don't understand well how can I manage to do this using imadjust. As fas as I understood from the documentation it correlates a range, to another range. Is that right? Could somebody give me some guidance? Thanks!

Best Answer

No, it doesn't do correlations. What is does is to linearly map one intensity region into another. So you could do the first row of your equalization plots because they are linear, but not any on the bottom row because they aren't linear. You could do the ones on the bottom row with intlut().

Also, check out my histogram shaping app: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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MATLAB: What is the difference between AHE and CLAHE

CLAHE limits the range of the output image so that you don't get big outliers. In essence, it clips values if they get too huge. This is the usual method people use. There is no real harm but good benefits so there's no reason not to do it. I don't ever see straight AHE being used. CLAHE is performed by adapthisteq() in the Image Processing Toolbox.

There is also a histogram equalization function histeq() but it's worthless because it uses the histogram of the whole image. Anyone who's ever used histogram equalization can tell you that global histeq is no good. Histogram equalization is only good if you do it locally like CLAHE does.

MATLAB: Extract Imadjust values

Just get the min and max value of your new array J

minJValue = min(J(:));
maxJValue = max(J(:));
imshow(yourOtherImage, [minJValue maxJValue]);

See the FAQ for ideas on sharing variables between functions: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

Best Answer

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MATLAB: What is the difference between AHE and CLAHE

MATLAB: Extract Imadjust values

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