Re: [WM]: Length of watermarking.

[krutarth bhatt <krutarthbhatt@yahoo.co.in>]

Hello Siju,
 
Actually speaking it depends upon perticular algorithm you r using for example cox et al selects first 1024 dct/fft coefficient in
order of decreasing magnitude excluding dc. In spatial spread spectrum technique that will be no. of pixals/chip-rate etc. But in
any case you wont have payload-length or size of mark greater than size of image. 
 
But Generally you can say pay load depends on application -like in  captioning watermark you want as larg payload as possible,
imperceptibility-the more the payload it is more likely to have perceptibile distortions in watermarked image, robustness-if you
consider final mark as repeated version of one mark. I dont think length of mark afftect the security of mark-marking algorithm. but
i dont know exactly. 
 
Regards
Krutarth

Siju Joseph <sigu_joseph@yahoo.co.uk> wrote:
Hi all,
I am sigu Joseph, doing a project on the field of watermarking, My query is, What will be length of the watermark , for an image of
size 256x256. Whether the size of the watermark will be dependent on image size. Is there is any standards, if not, what will be the
suggest able length, 

Thanks in advance 

Sigu



Regards,

Siju Joseph



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