DWT based Watermarking

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mary 2011-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/15930-dwt-based-watermarking

回答： Peter Eze 2017-3-10

hi i m doing project on watermarking ,i hv used fingerprint image and face image .i hv applied DWT on finger print thn divided detail cofficients into M*N size blocks and selected the high order bits of each block .and embed bits on specific positions.faceimage is used as watermark .nw i dnt know how to detect the watermark .plz help me in the detection process.reply as soon as possible.

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Walter Roberson 2011-9-15

You ask questions, then do not return to the topic for 3 months, and when you do, ask for a reply "as soon as possible". It is not clear why anyone should bother replying for another 3 or 6 months.

mary 2011-9-25

i didnt find any helpful information from matlab centeral

i ws in very big problem .u r right bt u hv no idea of my problem

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Answer 1

Walter Roberson 2011-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/15930-dwt-based-watermarking#answer_21590

Detecting the watermark is going to depend upon the details of how you embedded it. Did you solve the embedding problem? If so, then you should probably update your previous question with the details of what you did to resolve it; then we would have something to go on.

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Walter Roberson 2011-9-25

In your previous question, you did not indicate how you ended up doing the embedding. If we do not know how you did the embedding, we cannot tell you how to do the detection.

Or is your question more general, along the lines of, "Suppose we have series of images, some of which have been watermarked by unknown means that may vary from image to image. How can we determine whether any given image has *some* watermark in it, including cases where we might not be able to determine exactly which bits are the watermark bits?"

mary 2011-9-27

in the watermark embeding process i hv used hash function and i hv calculated positions .on that poistions watermark is embeded.then i hv recombined all the M*N blocks(previous question) and apply the IDWT .now in the detection process i m using the same procedure.bt i dnt know how to compare values .and what will be the output after detection?if i want to draw a graph or plot the detected watermark thn how it will work ?if u have any idea plz help me

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