Image feature extraction calculation

how can i calculate Contrast,Corelation,Homogeneity value from an image using Matlab?Please help me sharing the source code?

Answer 1

[Manish M]

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')

[Syed Zenith Rhyhan]

Thanks,SIr. But I can't implement this to my work.Please give me the source code format if possible.

[Image Analyst]

There is code in his answer, and, since you've accepted the answer, we assume that you figured out how to incorporate it into your code.

[Syed Zenith Rhyhan]

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]

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.