[WM]: question about one-bit and multiple-bit watermark and ask for papers

["Xiaohong Pang" <xhpang@hotmail.co.uk>]

Hi, watermarkers:

1.

I am confused about the defination of one-bit watermark and multiple-bit watermark.  Some papers said that the one-bit watermark
is,also referred to as semi-private watermakring, at detection a binary decision is made as to the presence of the watermark most
often using the hypothesis testing; The multiple-bit watermark,also referred to as blind watermarking, extracts the embedded
information of the watermark. This defination was given from the detection aspect.

While other literatures mentioned one-bit watermark or multiple-bit watermark in the aspect of payload( the information embedded in
the original image). I can be easy to understand embeding a multiple-bit watermark in the original image(or other multimedia
content). But is it possible only embed 1 bit watermark?

Could anybody tell me the real meaning of one-bit watermark and multiple-bit watermark and give me a clear explanation?

2.

Does anybody have the following papers and could you sent them to me?

(1) S.Pereira,J.J.K.O Ruanaidh,and T. Pun.  Secure robust digital image 
watermarking using the lapped orthogonal transform.   In ISET/SPIE 
Electronic Imaging'99. San Jose,CA,USA, January 1999.

(2) S. Pereira and T.Pun.  Fast robust template matching for affine resistant watermarks. In 3rd International Information Hiding
Workshop, Dreseden, Germany,September 1999.


Thanks,

Anna


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