Exercise: Calculate the Correlation measure for the horizontal test image. this is easier if you do the GLCM Mean and Variance exercises first and use their results.
Hint: Correlation must always be between -1 and +1 before scaling. Any other result shows an error. It is easy to make calculation errors. The most error-free way to do this calculation is to set up the formula on a spreadsheet. On a spreadsheet, you can at least be certain that there have been no arithmetic errors, even though it is still easy to make an error in entering the formula.
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