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    Apparatus and method for embedding and extracting a digital watermark based on a wavelet
    11.
    发明授权
    Apparatus and method for embedding and extracting a digital watermark based on a wavelet 有权
    基于小波嵌入和提取数字水印的装置和方法

    公开(公告)号：US07092545B2

    公开(公告)日：2006-08-15

    申请号：US10329546

    申请日：2002-12-27

    申请人： Yong-Seok Seo ,  Sanghyun Joo ,  Weon Geun Oh

    发明人： Yong-Seok Seo ,  Sanghyun Joo ,  Weon Geun Oh

    IPC分类号： G06K9/00

    CPC分类号： G06T1/0057 ,  G06T1/0028 ,  G06T2201/0052 ,  G06T2201/0083 ,  G06T2201/0202

    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.

    摘要翻译： 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。

    Apparatus and method for preventing illegal distribution of digital contents by using a fingerprinting technique
    16.
    发明申请
    Apparatus and method for preventing illegal distribution of digital contents by using a fingerprinting technique 审中-公开
    通过使用指纹技术防止数字内容的非法分发的装置和方法

    公开(公告)号：US20070177763A1

    公开(公告)日：2007-08-02

    申请号：US11712435

    申请日：2007-03-01

    申请人： Sanghyun Joo ,  Won Kim ,  Yong-Seok Seo ,  Chang Park

    发明人： Sanghyun Joo ,  Won Kim ,  Yong-Seok Seo ,  Chang Park

    IPC分类号： G06K9/00 ,  G06K9/36

    CPC分类号： G06T1/005 ,  G06T2201/0052 ,  G06T2201/0063 ,  G06T2201/0081 ,  G06T2201/0083

    摘要： An apparatus and method for preventing illegitimate distribution of digital contents on Internet obtains a first wavelet image having a user information-embedding region by performing a wavelet transformation (WT). The user information embedding region of the first wavelet image is wavelet-transformed to obtain a second wavelet image composed of a discrete cosine (DC) region and high-frequency regions second wavelet image. A high-frequency components removed image is obtained by removing high-frequency components in the high-frequency regions of the second wavelet image, and subjected to an inverse WT (IWT) to be outputted as an IWT image. A user information embedding unit embeds user information to the IWT image, wherein data of the user information are sequentially embedded to positions where a difference value between the user information embedding region and the new user information embedding region is small, to thereby reset the user information embedding region as the user information.

    摘要翻译： 用于防止数字内容非法分发的装置和方法通过执行小波变换（WT）获得具有用户信息嵌入区域的第一小波图像。 第一小波图像的用户信息嵌入区域进行小波变换，得到由离散余弦（DC）区域和高频区域第二小波图像构成的第二小波图像。 通过去除第二小波图像的高频区域中的高频分量并获得作为IWT图像输出的逆WT（IWT）来获得高频成分去除图像。 用户信息嵌入单元将用户信息嵌入IWT图像，其中用户信息的数据被顺序地嵌入到用户信息嵌入区域和新的用户信息嵌入区域之间的差值小的位置，从而重置用户信息 嵌入区域作为用户信息。

    Method for blindly embedding and extracting a watermark by using wavelet transform and an HVS model
    17.
    发明申请
    Method for blindly embedding and extracting a watermark by using wavelet transform and an HVS model 有权
    通过使用小波变换和HVS模型盲嵌入和提取水印的方法

    公开(公告)号：US20050094845A1

    公开(公告)日：2005-05-05

    申请号：US10778552

    申请日：2004-02-17

    申请人： Seon Lee ,  Sanghyun Joo ,  Young Suh

    发明人： Seon Lee ,  Sanghyun Joo ,  Young Suh

    IPC分类号： H04N7/24 ,  G06K9/00 ,  G06K9/36 ,  G06T1/00

    CPC分类号： G06T1/0028 ,  G06T2201/0052 ,  G06T2201/0083 ,  G06T2201/0202

    摘要： The present invention relates to a method for blindly embedding and extracting a watermark by using wavelet transform and a human visual system (HVS) model, which obtains both robustness and invisibility by applying the HVS model of NVF or JND imitating a human visual system to a middle frequency band for wavelet transformation and using a quantization step determined adaptively according to the importance of wavelet coefficient. A method according to the present invention includes the steps of: decomposing an original image by a wavelet and selecting a middle frequency band as a watermark embedment area; obtaining an HVS model having a human visual recognition information at each embedding potion; determining the importance of the coefficient for each embedding potion, and adaptively determining a quantization step for each embedment location by using the importance and the HVS model; quantizing each pair of embedment area by the quantization step and variably embedding a watermark sequence into a middle frequency band according to a value of the watermark; and performing inverse wavelet transform on an overall area into which the watermark sequence is embedded, and generating a watermarked image.

    摘要翻译： 本发明涉及通过使用小波变换和人类视觉系统（HVS）模型盲嵌入和提取水印的方法，其通过将模拟人类视觉系统的NVF或JND的HVS模型应用于 用于小波变换的中频带，并使用根据小波系数的重要性自适应确定的量化步长。 根据本发明的方法包括以下步骤：通过小波分解原始图像和选择的中间频带作为水印嵌入区域; 获得每个嵌入药水具有人视觉识别信息的HVS模型; 确定系数的重要性对各嵌入药水，并且适应性地确定用于通过使用重要性和HVS模型中的每个嵌入位置的量化步骤; 通过量化步长量化每一对的嵌入区域的和可变地嵌入根据水印的值的水印序列插入中间频带; 并对嵌入水印序列的整个区域进行逆小波变换，并生成水印图像。

    Method for embedding and extracting digital watermark on lowest wavelet subband
    18.
    发明申请
    Method for embedding and extracting digital watermark on lowest wavelet subband 有权
    在最小小波子带上嵌入和提取数字水印的方法

    公开(公告)号：US20050074139A1

    公开(公告)日：2005-04-07

    申请号：US10734142

    申请日：2003-12-15

    申请人： Yong Seo ,  Sanghyun Joo ,  Seon Lee

    发明人： Yong Seo ,  Sanghyun Joo ,  Seon Lee

    IPC分类号： H04N7/167 ,  G06K9/00 ,  G06K9/36 ,  G06T1/00 ,  H04N1/32

    CPC分类号： H04N1/32187 ,  G06T1/0057 ,  H04N1/3217

    摘要： Disclosed is a method for embedding a digital watermark on a wavelet lowest subband. The method including: 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 LLn of 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 LLn coefficient value for each embedded position with a mirror picture LLn′ coefficient value, and then altering the original picture LLn coefficient value; and in case the original picture LLn coefficient value is differentiated above a predetermined value with reference to the corresponding embedment strength λ, skipping the watermark embedment for the position.

    摘要翻译： 公开了一种在小波最小子带上嵌入数字水印的方法。 该方法包括：将多级小波变换原始复制图像的DC分量区域设置到水印嵌入区域，并对嵌入区域的原始图像LLn进行高频滤波; 产生用于指定像素位置的索引信息和要嵌入的水印序列; 计算水印嵌入区域的每个位置的嵌入强度λ; 在水印序列被顺序地嵌入在由索引信息指定的嵌入位置上的情况下，将每个嵌入位置的原始图像LLn系数值与镜像LLn'系数值相互比较，然后改变原始图像LLn系数值; 并且在参照相应的嵌入强度λ1将原始图像LLn系数值微分到高于预定值的情况下，跳过该位置的水印嵌入。