Image analysis – Applications
Reexamination Certificate
2003-12-15
2008-03-11
Allison, Andrae (Department: 2624)
Image analysis
Applications
C382S232000
Reexamination Certificate
active
07343025
ABSTRACT:
A for embedding a digital watermark on a wavelet lowest subband includes: setting a DC component region of a multi-stage wavelet-transformed original copy image to a watermark embedment region, and high-frequency filtering an original picture LLnof the embedment region; generating index information for designating a pixel position, and a watermark sequence to be embedded; calculating an embedment strength λ for each position of the watermark embedment region; in case the watermark sequence is sequentially embedded on an embedded position designated by the index information, mutually comparing the original picture LLncoefficient value for each embedded position with a mirror picture LLn′ coefficient value, and then altering the original picture LLncoefficient value; and in case the original picture LLncoefficient value is differentiated above a predetermined value with reference to the coffesponding embedment strength λ, skipping the watermark embedment for the position.
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Joo Sanghyun
Lee Seon Hwa
Seo Yong Seok
Allison Andrae
Electronics and Telecommunications Research Institute
Lowe Hauptman & Ham & Berner, LLP
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