how I can measure the robustness of watermark?
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I am working on one of the watermarking algorithm, I wanna measure the robustness of the watermark Image the PNSR used for original Image , I could not use it for watermark because it is double Image , the measure should done between the Watermark and Extracted Watermark, all of images are unit8 class any suggestion please?
4 Comments
Image Analyst
on 10 Dec 2017
psnr() is a built-in function since R2014a. Why are you overwriting it with your own?
ALso, if you embedded a color watermark, and you're extracting a grayscale version of it, then your extraction method is not right. You should be able to extract the very same image you embedded.
Answers (1)
Walter Roberson
on 10 Dec 2017
double() the image that is uint8 before calculating the PSNR against the double() array.
2 Comments
Subhadeep Koley
on 20 Jan 2018
Edited: Walter Roberson
on 20 Jan 2018
[row col]=size(original_wm);
extracted_wm=imresize(extracted_wm,[row,col]);
after executing this piece of code psnr() will work fine.
Apart from psnr you can also test structural symmetry between two images by calling
ssimval=ssim(extracted,original);
Hope this helps :)
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