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RE: [WM]: Transformation Selection
In my opinion, there are a number of reasons to transform a work from the time/space domain into some other domain prior to
watermark embedding and detection. One reason is for computational efficiency.
It may be easier to apply a particular watermark in one domain. If the transformation is linear, then anything that can be done in
one domain can also be done in the original domain, but it might be more complicated. A second reason is that the work may have
some properties in the transformed domain that the watermarker wants to exploit. For example, transforming into a perceptually
uniform domain would allow more control over the fidelity of the watermark.
I think the choice of domain alone is not sufficient for assessing the properties of the watermarking algorithm. We need to look at
the watermarking algorithm and the properties of works in the transformed domain and how the two interact.
- Jeffrey
> -----Original Message-----
> From: watermarking-owner@watermarkingworld.org [mailto:watermarking-
>owner@watermarkingworld.org] On Behalf Of Michael Z Chen
> Sent: Wednesday, May 31, 2006 10:33 PM
> To: watermarking@watermarkingworld.org
> Subject: [WM]: Transformation Selection Hi Watermarking
>Researchers,
> Most of the my experiments show that It is difficult to tell which
>transformation method is better: DCT, DFT or DWT. We know that they
>perform differently against to different types of attacks. Also I have
>to say that this performance change based on the image, watermark and
>algorithm. At least my experience say that.
>
> I really wonder that what other watermarking people think about this
>issue. Do you think we should select one of the transformation based
>on the image,watermark and algorithm?
>
> Thank you for all the answers!
>
> Best
>
> Michael Z. Chen
> Doctorate Student
>
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