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    • 4. 发明申请
    • METHOD AND APPARATUS FOR WATERMARKING IMAGES
    • 水印图像的方法和装置
    • WO2002061669A1
    • 2002-08-08
    • PCT/US2002/004667
    • 2002-01-10
    • THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKLIN, Ching-YungCHANG, Shih-Fu
    • LIN, Ching-YungCHANG, Shih-Fu
    • G06K9/00
    • G06T1/0057G06T1/0042G06T1/005G06T2201/0052G06T2201/0061H04N1/32165H04N1/32187H04N1/32277H04N1/3232H04N2201/3236H04N2201/327
    • Digital watermarks are embedded in image data (102)in order to enable authentication of the image data and/or replacement of rejected portions of the image data. Authentication codes are derived by comparing selected discrete cosine transform (DCT) (104) coefficients within DCT data (106) derived from the original, spatial-domain image data. The authentication codes thus generated are embedded in DCT coefficients (612) other than the ones which were used to derive the authentication codes. The resulting, watermarked data can be sent or made available to one or more recipients who can compress or otherwise use the watermarked data. Image data derived from the watermarked data - e.g, compressed versions of the watermarked data - can be authenticated by: extracting the embedded authentication codes, comparing DCT coefficients derived from the coefficients from which the original authentication codes were generated; and determining whether the compared DCT coefficients are consistent with the extracted authentication codes.
    • 数字水印被嵌入在图像数据(102)中,以便能够对图像数据进行认证和/或替换图像数据的被拒绝的部分。 通过比较从原始的空间域图像数据导出的DCT数据(106)内的选定的离散余弦变换(DCT)(104)系数,导出认证码。 这样生成的认证码被嵌入除了用于导出认证码的那些之外的DCT系数(612)中。 所得到的水印数据可以被发送或使其可用于可压缩或以其他方式使用水印数据的一个或多个接收者。 从水印数据导出的图像数据(例如,经加水印数据的压缩版本)可以通过以下方式来认证:提取嵌入的认证码,比较从产生原始认证码的系数导出的DCT系数; 以及确定所述比较的DCT系数是否与所提取的认证码一致。
    • 6. 发明申请
    • METHOD AND DEVICE FOR WATERMARKING ON STREAM
    • 用于水上标记的方法和装置
    • WO2007068648A1
    • 2007-06-21
    • PCT/EP2006/069433
    • 2006-12-07
    • THOMSON LICENSINGNGUYEN, PhilippeBAUDRY, SéverineNATUREL, Corinne
    • NGUYEN, PhilippeBAUDRY, SéverineNATUREL, Corinne
    • G06T1/00
    • G06T1/0057G06T2201/0052G06T2201/0065
    • The invention relates in particular to a streamwise method of watermarking independent of the compression parameters used (for example type of the transform) so as to allow the reading of the watermarking inserted independently of the format of the data received. The watermarking method according to the invention consists in generating a contribution matrix M T1 in the transformation space T 1 , in projecting it into another domain T 2 and in watermarking the data in this domain T 2 on the basis of the projected matrix M T1 so as to allow a watermark reader operating in the transformed transformation space T 1 to read back the inserted watermarking in the transformation space T 2 . The contribution matrix M T1 representing the modifications induced on the coefficients in the transformation space T 1 by insertion of the watermarking cue in this same domain.
    • 本发明特别涉及独立于所使用的压缩参数(例如变换的类型)的水印的流式方法,以允许独立于接收的数据的格式插入的水印的读取。 根据本发明的水印方法包括:在变换空间T 1中生成贡献矩阵M SUB1,将其投影到另一个域T SUB2 / 并且基于投影矩阵M T1来对该域T 2中的数据进行水印,以便允许水印读取器在变换的变换空间T 1 以读取在变换空间T 2中插入的水印。 通过在该相同的域中插入水印提示来表示在变换空间T 1中的系数上引起的修改的贡献矩阵M T1 T 1。
    • 8. 发明申请
    • WATERMARKING OF DIGITAL IMAGES USING WAVELET AND DISCRETE COSINE TRANSFORMS
    • 使用小波和离散COSINE变换对数字图像进行水印
    • WO00016516A1
    • 2000-03-23
    • PCT/US1999/020649
    • 1999-09-10
    • G06F17/14G06T1/00G09C5/00H04N1/32H04N1/387H04N1/40H04N1/46H04N1/60H04N7/24H04L9/00
    • G06T1/0064G06T1/0057G06T2201/0052H04N1/32154H04N1/3217H04N1/32309H04N1/3232H04N2201/3233H04N2201/327H04N2201/328
    • The present invention relates to a method for embedding a watermark into a black and white or color digital image [D(x)]. Basically the inventive method comprises the steps of transforming the digital image using a wavelet transform [WC(y)], transforming a watermark using discrete cosine transform (DCT), integrating the wavelet-transformed digital image with the DCT-transformed watermark [DW(x) + WC(y)] to insert the watermark into the image, and generating the watermarked image using inverse wavelet transform [D(x)']. For color images, RGB mode is converted into YIQ mode using a conversion matrix and the wavelet transform is applied to the Y-, I-, Q- values. This inventive digital watermarking of a color image is found to be highly robust against lossy compression and other image processing operations, compared to conventionally known methods which are known to be unsuitable for watermarking color images.
    • 本发明涉及一种将水印嵌入到黑白或彩色数字图像[D(x)]中的方法。 基本上,本发明的方法包括以下步骤:使用小波变换[WC(y)]变换数字图像,使用离散余弦变换(DCT)变换水印,将小波变换数字图像与DCT变换水印[DW x)+ WC(y)]将水印插入到图像中,并使用逆小波变换[D(x)']生成带水印的图像。 对于彩色图像,使用转换矩阵将RGB模式转换为YIQ模式,并将小波变换应用于Y,I,Q值。 发现彩色图像的本发明的数字水印被认为对于有损压缩和其他图像处理操作是高度鲁棒的,与已知的不适合于对彩色图像进行水印化的已知方法相比。
    • 9. 发明申请
    • ELECTRONIC WATERMARKING METHOD AND METHOD OF EXTRACTING WATERMARK INFORMATION
    • 电子水印方法和提取水印信息的方法
    • WO99001980A1
    • 1999-01-14
    • PCT/JP1998/002674
    • 1998-06-15
    • G06T1/00H04N1/32H04N1/387
    • H04N19/63G06T1/0057G06T2201/0052H04N1/32154H04N1/3216H04N1/3217H04N1/32176H04N1/32187H04N1/32288H04N21/23892H04N21/8358H04N2201/3233H04N2201/327
    • An electronic watermarking method which makes it difficult to erase other information such as signature data combined with image data and which does not require the original image in extracting the information. The image signal is subjected to wavelet transformation to extract a multiple resolution approximated area (MRA), which is spread to a wide-band frequency spectrum in a pseudonoise sequence (PN sequence), and signature data is incorporated into a specific part of the spread frequency spectrum according to predetermined rules. Then, the combined signals are subjected to spectrum-despreading according to the PN sequence and to wavelet inverse transformation so as to generate an image signal combined with the signature data. By this method, because the signature data is combined for an MRA, it is resistant to signal processings such as filtering. Further, the use of the spread spectrum provides a high level of secrecy. Moreover, the feature of the wavelet transformation can be utilized to synthesize signature data in multiple layers.
    • 一种电子水印方法,其使得难以擦除诸如与图像数据组合的签名数据等其他信息,并且在提取信息时不需要原始图像。 对图像信号进行小波变换以提取在分离的伪噪声序列(PN序列)中扩展到宽带频谱的多分辨率近似区域(MRA),并将签名数据并入到传播的特定部分 频谱根据预定规则。 然后,根据PN序列对组合的信号进行频谱解扩,并进行小波逆变换,以生成与签名数据组合的图像信号。 通过这种方法,由于签名数据被组合用于MRA,所以它抵抗诸如过滤之类的信号处理。 此外,扩展频谱的使用提供了高水平的保密性。 此外,小波变换的特征可以用于合成多层签名数据。