I want to calculate the PSNR of the complete image after applying DWT

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tina jain
tina jain 2015-4-19
I have used DWT, after this DPCM on LL band, and one other compression scheme for remaining bands and calculated PSNR individually for each band. Now I want to calculate the overall PSNR value of the image.How to do this? please suggest. Image after DWT is as follows

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