MATLAB: What is the difference between imadjust and histeq

histogram equalizationImage Processing Toolbox

Hello, friends. What are the differences between imadjust and histeq in Matlab, and how they work exactly.

Best Answer

imadjust linearly scales the histogram whereas histeq does not. Try both and look at the histograms of the outputs. Images will tend to look more natural with imadjust. histeq() is just one of those things that they teach you about in school but no one really ever uses because it makes the images look weird.

See my attached demos.

Related Solutions

MATLAB: How to enchant image using histeq

It's a BAD idea to call your image variable "image" because that is the name of a built-in function.

Simply linearly stretch the image with mat2gray():

outputImage = uint8(255 * mat2gray(grayImage));

Histogram equalization gives crummy, unnatural looking images and I always avoid it unless forcefully asked by students who need it for their homework. In the real world I don't think any good image analysts use it because (1) it's not necessary, and (2) it gives lousy looking images.

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

Related Solutions

MATLAB: How to enchant image using histeq

MATLAB: Extract Imadjust values

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