Do we have an extraction code for difference expansion reversible watermarking?

2014 2 28
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更新时间：2014 2 28
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I tried to implement DE on some images, but couldn't find in the code where is the image, that is being watermarked into the default image of ship. Secondly, if it's reversible watermarking there must be a code for detection of watermark and to extract it for
http://www.mathworks.in/matlabcentral/fileexchange/25245-reversible-watermarking-by-difference-expansion/content/ian_Difference_Expansion.zip
This is the source from where I got the code for the algorithm.

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