MATLAB: Measure image quality NC

digital image processingImage Processing Toolboxmeasure image qualityncc

Hello, I have two images (i and iw) and i want to measure the similarity and dissimailarity between them there is function it is called Normalized Cross Correlation (NCC) Could any body support me in the matlab code for it

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Normalized cross correlation is performed by normxcorr2(). I'm attaching a demo. As far as I know this is not commonly used to asses image quality. PSNR and SSIM are more commonly used. I'm attaching a PSNR demo. There are functions for them in recent versions of the Image Processing Toolbox.

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Well I'm no stego expert but I thought usually they would use psnr or ssim to compare the concealing image and the original cover image, or the original message image and the recovered/retrieved hidden image. Both of those functions are built in to the Image Processing Toolbox.

MATLAB: Extracting variables from nc file

Extract the stored pressure levels. Then use

mask = ismember(plev, [500, 700, 850, 1000]);

then

hus_subset = hus(:, :, mask, :);

Now you can create a new (or updated) nc file containing the subset.

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