How to compute psnr of original lena image and watermarked lena image?

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The attached code is used for embedding and extraction of digital watermark on the cover image by extracting its feature points. I wish to compute the psnr value of lena image and watermarked lena image.As per the research paper ,the computed psnr value of watermarked lena image is 38.9119. But when i am calculating psnr value i am getting the value to be 49.5156 using peaksnr = psnr(A,ref) command. can anybody tell me any other method so that i can get the desired psnr value. Attaching code for watermarking and test images required.

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