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    • 66. 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。
    • 67. 发明申请
    • HIGH REDUNDANCY SYSTEM AND METHOD FOR WATERMARKING DIGITAL IMAGE AND VIDEO DATA
    • 用于水印数字图像和视频数据的高冗余系统和方法
    • WO00068871A1
    • 2000-11-16
    • PCT/US2000/012369
    • 2000-05-05
    • G06T1/00H04N1/32H04N7/26G06K9/00G06K9/36G09C3/00H04L9/00
    • H04N19/467G06T1/005H04N1/32154H04N1/32165H04N1/32187H04N1/32277H04N21/23892H04N21/8358H04N2201/3233H04N2201/327
    • A method and system for encoding watermark information (211) within digital data, which can be in a compressed format, with a watermark encoder (212). A sequence of bits representing the watermark information is mapped into a first plurality of groups which includes more bits than the sequence of bits. The bits from each group of the first groups are interleaved to form a second plurality of groups. The bits from the second groups are serialized to form an encoded sequence of bits. Coefficients representing the digital data are modified according to the encoded sequence of bits. In one embodiment, a coefficient is made into an even and odd numbers when the bit has a first and second values, respectively. The digital data can be subsequently read to retrieve the encoded sequence, and the encoded sequence is then decoded and compared to the original watermark information.
    • 一种用水印编码器(212)对数字数据内的水印信息(211)进行编码的方法和系统,其可以是压缩格式。 表示水印信息的比特序列被映射到包括比比特序列多的比特的第一多个组。 来自每组第一组的比特被交织以形成第二组。 来自第二组的位被序列化以形成编码的位序列。 表示数字数据的系数根据编码的比特序列被修改。 在一个实施例中,当该位分别具有第一和第二值时,系数被制成偶数和奇数。 随后读取数字数据以检索经编码的序列,然后将经编码的序列解码并与原始水印信息进行比较。
    • 68. 发明申请
    • ELECTRONIC WATERMARKING IN THE COMPRESSED DOMAIN UTILIZING PERCEPTUAL CODING
    • 通过感知编码插入压缩域的电子薄膜
    • WO99029114A1
    • 1999-06-10
    • PCT/US1998/025532
    • 1998-12-03
    • G06T1/00G10L19/00H04N1/32H04N7/26
    • H04N19/00G06T1/0028G06T1/0035G06T2201/0052G06T2201/0053G06T2201/0083G10L19/018H04N1/32128H04N1/32149H04N1/32154H04N1/32187H04N1/32272H04N1/32277H04N1/32299H04N1/32304H04N19/147H04N19/19H04N19/196H04N19/467H04N19/48H04N19/90H04N21/23892H04N21/8358H04N2201/3233H04N2201/3239H04N2201/327H04N2201/3281
    • A method and apparatus are described for inserting a watermark in the compressed domain. The watermark inserted does not require a reference. An overall watermarking system incorporating the invention combines cleartext, bitstream, and integrated watermarking. In a perceptual coder, the data enters a filterbank, where it is processed into multiple separate coefficients. A rate/distortion control module uses noise threshold information from a perceptual coder, together with bit-count information from a noiseless coder, to compute scale factors. The coefficients are multiplied by the scale factors and quantized, then noiseless coded and then output for further processing/transmission. The invention supports three embodiments for inserting a mark into the bitstream imperceptibly. It is assumed that some set of scale factor bands have been selected, into which mark data will be inserted. In one embodiment, a set of multipliers {xi=2 : i ELEMENT M} is chosen. Each triple is modified by dividing the scale factor by xi, multiplying the quantized coefficients by {xi}, and adding mark data to the non-zero modified quantized coefficients. In an alternate embodiment, watermark data is represented via two characteristics of the bitstream data. A Huffman table is selected for encoding the Scale Factor Band receiving watermark data which is not the table that would normally be used. The watermark data bit is set according to any desired scheme, and the quantized coefficients are derived using the alternate Huffman table. In another embodiment, watermarking is integrated with quantization. The watermark is therefore difficult to remove without perceptible effects. The fact that marking data is present is again indicated by characteristics of the bitstream data. The modification factors {xi} are now all close to unity.
    • 一种将水印插入压缩域的方法和装置。 插入的水印不需要参考。 根据本发明,用于插入水印的完整系统组合纯文本,比特流和嵌入水印。 在感知编码器中,数据进入一组滤波器,在其中以几个不同系数的形式处理它们。 速度和失真控制模块使用来自感知编码器的噪声阈值信息,来自静音编码器的位计数信息来计算缩放因子。 系数乘以比例因子并量化,然后静默编码并提取用于进一步处理/传输。 本发明包括三个实施例,用于以不可察觉的方式在比特流中插入标记。 假设已经选择了其中插入了标记数据的一组比例因子带。 根据一个实施例,选择一组乘法器{xi = 2 :i ELEMENT M}。 每个三组是通过将比例因子通过XI,由{X}量化系数相乘并添加品牌数据到量化系数改性,改性的,非零的。 在另一个实施例中,标记数据由两个比特流数据特征表示。 选择霍夫曼表来选择水印数据,该数据接收不在正常使用的表格中的比例因子带。 水印数据比特被调整为任何期望的模式,并且使用替代霍夫曼表格提取量化系数。 在另一个实施例中,水印通过量化被整合,因此难以在没有可感知的效果的情况下被去除。 比特流数据特征进一步指示水印数据的存在。 修改因子{xi}现在都接近于统一。