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    • 6. 发明授权
    • Robust blind watermarking method in wavelet DC components
    • 小波直流分量中的鲁棒盲水印方法
    • US06934403B2
    • 2005-08-23
    • US10029835
    • 2001-12-31
    • Sanghyun JooYong-Seok SeoYoung Ho SuhWeon Geun Oh
    • Sanghyun JooYong-Seok SeoYoung Ho SuhWeon Geun Oh
    • H04N5/913G06T1/00G06K9/00
    • G06T1/0057G06T2201/0052G06T2201/0083
    • An apparatus and method for embedding and extracting digital watermarks using a blind mode based on wavelet transform which is robust to external attacks while being capable of minimizing a degradation in picture quality caused by embedding of the watermarks. In accordance with the invention, watermarks protection of the copyright for desired data are embedded in DC component domains of wavelet-transformed domains. In accordance with the invention, embedding of watermarks in a target image corresponding to a target domain in which the watermarks are to be embedded, is achieved by generating a data stream of the watermarks in accordance with a key value selected by the user, generating index information representing positions where the watermarks are to be embedded, in accordance with a key value selected by the ser, and reflecting the watermark data stream on data values of pixels in the target image at the positions based on the index information.
    • 一种使用基于小波变换的盲模式嵌入和提取数字水印的装置和方法,该小波变换对于外部攻击是鲁棒的,同时能够最小化由嵌入水印引起的图像质量的劣化。 根据本发明,水印保护期望数据的版权被嵌入到小波变换域的DC分量域中。 根据本发明,通过根据用户选择的键值产生水印的数据流,将水印嵌入在与要嵌入水印的目标域相对应的目标图像中,产生索引 根据由该服务器选择的键值来表示要嵌入水印的位置的信息,并且基于该索引信息,将该水印数据流反映在该目标图像中的像素的数据值上。
    • 7. 发明授权
    • Apparatus and method for embedding and extracting a digital watermark based on a wavelet
    • 基于小波嵌入和提取数字水印的装置和方法
    • US07092545B2
    • 2006-08-15
    • US10329546
    • 2002-12-27
    • Yong-Seok SeoSanghyun JooWeon Geun Oh
    • Yong-Seok SeoSanghyun JooWeon Geun Oh
    • G06K9/00
    • G06T1/0057G06T1/0028G06T2201/0052G06T2201/0083G06T2201/0202
    • 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.
    • 在将数字水印嵌入图像的装置中,水印嵌入区域提取单元从小波变换的整体图像中提取图像区域以包含水印。 水印生成单元根据用户的私钥生成要嵌入的水印数据行。 归一化操作单元通过使用量化单元将量化数据值归一化为归一化数据值。 逆量化逆量化并输出归一化数据值。 水印嵌入单元将水印嵌入数据值作为对应的像素数据值嵌入到水印嵌入区域中,其中通过从逆量化数据值中减去在该水印嵌入数据值之前添加的水印数据值, 量化。