Finding n largest coefficient to local energy ratio

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NC on 10 Jun 2018
Commented: John D'Errico on 10 Jun 2018
I want to the n largest coefficient to local energy ratio. These coefficients are gained by applying PCA to an image and I have decided to take 5 largest coefficients. But what is the meaning of energy of an image? How to calculate it in Matlab using the equation shown in the attached image?
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John D'Errico
John D'Errico on 10 Jun 2018
Please don't post the same question multiple times, just to add some information to the first one.

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