发明名称 |
Apparatus and method for embedding and extracting a digital watermark based on a wavelet |
摘要 |
In an apparatus for embedding digital watermarks into an image, a watermark embedding region extraction unit extracts an image region to contain watermarks from a wavelet transformed entire image. A watermark generation unit generates a watermark data row to be embedded according to a user's private key. A normalization operation unit normalizes the quantized data value by using a quantization unit into a normalized data value. An inverse quantization inversely quantizes and outputs the normalized data value. A watermark embedment unit embeds a watermark-embedded data value as a corresponding pixel data value into the watermark embedding region, wherein the watermark-embedded data value is obtained by subtracting, from the inversely quantized data value, the watermark data value added prior to the quantization.
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申请公布号 |
US2004047489(A1) |
申请公布日期 |
2004.03.11 |
申请号 |
US20020329546 |
申请日期 |
2002.12.27 |
申请人 |
SEO YONG-SEOK;JOO SANGHYUN;OH WEON GEUN |
发明人 |
SEO YONG-SEOK;JOO SANGHYUN;OH WEON GEUN |
分类号 |
H04N7/24;G06T1/00;(IPC1-7):G06K9/00;G06K9/54 |
主分类号 |
H04N7/24 |
代理机构 |
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地址 |
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