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embedding a watermark into an image (using matlab)

Posted on 2002-05-15
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Last Modified: 2007-12-19
i've apply DCT to the image,then get a DCT coeffient matrix,how to arrange it into zig-zag sequence.I use matlab.

if you have matlab sourcecode for watermark embeding system,or tell me someplace i can find it,i'll appreciate you for much more point.
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Question by:saner
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6 Comments
 
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Expert Comment

by:jonnin
ID: 7016144
Average a watermarked image with the real image. If the watermaked image has a special color (you choose, white is ok, black, whatever) do not average, just put the real pic's data in (a masking scheme).  You can weight the real image or watermarked image more in the process, if one should be much more or less important (how light a watermark).  Do this before dct, not after, both because the dct damages the image and because its much more complcated...

 
I hope this is what you meant, you question is not real clear...

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Expert Comment

by:ygal02
ID: 7029385
Do you need visible or invisible watermark ?
Also do you need the watermark for hidding information in the image or just proving (in case of illegal copying) that this is not the original image ?

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by:quirkyquirky
ID: 7299408
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by:ComTech
ID: 7300666
This person has been suspended for multiple violations of the Member Agreement, and will reject the proposed answer, and return your question to the Active Questions List.  The Moderator Group is deleting all 388 locked questions.

These were posted by three persons:

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by:nico5038
ID: 7515093

No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
 - PAQ'd and pts removed
Please leave any comments here within the
next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

Nic;o)
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Accepted Solution

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Jgould earned 0 total points
ID: 7548157
Question has been closed as per recommendation

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