A digital watermark is secretly embedded in image data
and used for copyright protection. Thus, it is not active
for piracy until it is detected. In this paper, we propose
a new digital watermarking scheme to color image which can
display the mark in a visible to invisible state. We propose
a digital visible watermarking scheme to color image which
controls the color transformation between the RGB and YCbCr
color systems for each pixel. In this scheme logo-mark is
displayed in a visible to invisible style on color image
according to a transform matrix that consists of the prescribed
entries and watermarking variables. The displayed mark is
changeable to invisible or half-visible state when it is
requested. Then, the original image is recovered smoothly
but the watermark remains in the invisible state. Moreover,
the mark color may be altered with another transform matrix
and be expressed with multiple watermarking. By using this
method, the author can show his copyright in variable state
at a time and may change the displayed mark to invisible
one without loosing the watermark signal and to keep it
against StirMark attacks.
This software development was conducted as
part of the Advanced Computerization Support Software Series
Development Project in 1999 by the Research Institute of Software
Engineering (RISE), commissioned by the Information Processing
Association (IPA).
For technical questions, contact info@ewatermark.com.
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