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[=3D?big5?q?=3DA6=3DB6=3DB0=3DEA=3DB9=3DA9?=3D@phoebe.hosting4u.net, =@phoebe.hosting4u.net]

<chukuodin@yahoo.com.tw>
Subject: [WM]: Watermark detection using non-normalized correlation
To: <watermarking@watermarkingworld.org>
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Dear Mr. /Ms.

We calculate correlation between original watermark and retrieval =
watermark in general situation, but the paper "SEMI-FRAGILE
WATERMARKING FOR VIDEO QUALITY EVALUATION IN BROADCAST SCENARIO" =
mentions that we can get a "correlation" between watermark and
image at encode side, then add watermark directly into DCT coefficient, =
decoder can calculate "non-normalized correlation" between
watermark and embedded coefficient. But this paper doesn=A1=A6t explain =
the procedure that calculates correlation in detail.

Does anyone know how to calculate the "non-normalized correlation" =
between image and watermark?

Thanks for your help.



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