How to calculate enrgy of a matrix
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sakshi ahuja
il 29 Mar 2016
Commentato: Salma Hassan
il 11 Set 2017
I am having a 2*2 matrix. say it is A=[1 2; 3 4]; how to calculate energy with this.
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Image Analyst
il 29 Mar 2016
What is your definition of energy? You could say that if the array is an image, the pixel values are energy already so you can just sum the array
energy = sum(A(:));
Or you can use the energy as defined from the gray level co-occurrence matrix of the array. From the help for graycoprops():
Calculate statistical properties of the GLCM.
stats = graycoprops(glcm)
stats =
Contrast: 2.8947
Correlation: 0.0783
Energy: 0.1191
Homogeneity: 0.5658
Perhaps you have some other definition - I don't know. After you read this, please clarify your definition of energy.
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Image Analyst
il 11 Set 2017
I don't know what your vector represents. It might represent energy. Pixels are energy - just go back to first principles to work out the units.
(A watts /square meter) * (B square meters/pixel) * (C Joules/(Watt second)) * (D seconds exposure time) = Joules that are collected in a one pixel area during the exposure time. So gray levels is proportional to Joules.
Salma Hassan
il 11 Set 2017
my feature vector was extracted by Discrete wavelet transform (DWT) as the paper in this link http://www.biomedres.info/biomedical-research/computer-aided-diagnostic-cad-for-feature-extraction-of-lungs-in-chest-radiograph-using-different-transform-features.html
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