Image feature extraction calculation

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Syed Zenith Rhyhan
Syed Zenith Rhyhan 2019-6-23
评论： Manish M 2019-6-27
how can i calculate Contrast,Corelation,Homogeneity value from an image using Matlab?Please help me sharing the source code?

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Manish M
Manish M 2019-6-23
Hi
  • Image contrast: image_contrast = max(grayImage(:)) - min(grayImage(:));
  • Correlation Coefficient: It is calculated b/w two images not with a single image. correlation = corr2(a, b) where a and b are two images.
  • Homogenity: homogeneity = graycoprops(graycomatrix(img), 'Homogeneity')
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Syed Zenith Rhyhan
Syed Zenith Rhyhan 2019-6-23
Hi
I want to calculate the homogenity of images. This can be done directly in Matlab with
homogeneity = graycoprops(graycomatrix(img), 'Homogeneity')
Is that right?
Unfortunately I'm not allowed to use the image processing toolbox. Is there some formula for calculating the homogenity so that I can implement it myself?
Or is the sourcecode of graycomatrix and graycoprops available, so that I just can take it?
Manish M
Manish M 2019-6-27
If you have the Image processing toolbox in MATLAB, then in the command window type 'edit graycoprops' & 'edit graycomatrix'. You'll get the source code.

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