[WM]: multi bit detection/extraction

[Micro Mysore <micromysore@gmail.com>]

Hello,

This question is in reference to the multibit watermarking case.

Are there any known methods published which combine the problem of joint detection of watermark and extraction of the payload bits ?

Reading through the literature, I have found few ways of achieveing this .. but each has their disadvantages ..
(DCT domain watermarking is what i refer to )

Case 1. 
--------------
Assume the received image is watermarked, an then proceed. As in spread spectrum case, multiply with the watermark at the receiver
and them extract signs. {-1,+1} mapped to {0,1}.
<This totally ignores to test the presence of watermark before extraction. Using this method will surely give us some bits>

Case 2. 
------------
First find if the received image is watermarked, if yes then proceed further to extract the watermark (playload bits).

Type1: Given that the carrier image can accomodate N bits (capacity), fix L bits and rest of the bits N-L be the payload
@inproceedings{ martin97digital,
    author = "Kutter, Martin and Jordan, Frederic and Bossen, Frank",
    title = "Digital Signature of Color Images using Amplitude Modulation= ",
    booktitle = "Proc. {SPIE} Storage and Retrieval for Image and Video Databases",
    volume = "3022",
    address = "San Jose, California",
    pages = "518--526",
    year = "1997",
    url = "citeseer.ist.psu.edu/article/kutter97digital.html" }

Type 2: Use 2 watermarks, one as template for detection, and another for carrying the actual payload. the energy now distrubuted
between the 2 watermarks.


Of all the literature I came across,I found this paper comming close to the solution ..

@article{bb57412,
        AUTHOR = "Loo, P. and Kingsbury, N.",
        TITLE = "Watermark detection based on the properties of error control codes",
        JOURNAL = "VISP",
        VOLUME = "150",
        YEAR = "2003",
        NUMBER = "2",
        MONTH = "April",
        PAGES = "115-121"}

any thoughts ?

-mic


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