公开(公告)号：WO9929114B1

公开(公告)日：1999-07-29

申请号：PCT/US9825532

申请日：1998-12-03

Applicant: AT & T CORP

Inventor： QUACKENBUSH SCHUYLER REYNIER ,  REIBMAN AMY RUTH ,  SHUR DAVID HILTON ,  SNYDER JAMES H

IPC: G06T1/00 ,  G10L19/00 ,  H04N1/32 ,  H04N7/26

CPC classification number: H04N19/00 ,  G06T1/0028 ,  G06T1/0035 ,  G06T2201/0052 ,  G06T2201/0053 ,  G06T2201/0083 ,  G10L19/018 ,  H04N1/32128 ,  H04N1/32149 ,  H04N1/32154 ,  H04N1/32187 ,  H04N1/32272 ,  H04N1/32277 ,  H04N1/32299 ,  H04N1/32304 ,  H04N19/147 ,  H04N19/19 ,  H04N19/196 ,  H04N19/467 ,  H04N19/48 ,  H04N19/90 ,  H04N21/23892 ,  H04N21/8358 ,  H04N2201/3233 ,  H04N2201/3239 ,  H04N2201/327 ,  H04N2201/3281

Abstract: 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.

Abstract translation: 描述了用于在压缩域中插入水印的方法和装置。 插入的水印不需要参考。 结合本发明的整体水印系统结合了明文，比特流和集成水印。 在感知编码器中，数据进入滤波器组，其中它被处理成多个分离的系数。 速率/失真控制模块使用来自感知编码器的噪声阈值信息以及来自无噪声编码器的位计数信息来计算比例因子。 系数乘以比例因子并量化，然后无噪声编码，然后输出进一步处理/传输。 本发明支持将标记插入比特流的三个实施例。 假设已经选择了一些比例因子频带，其中将插入标记数据。 在一个实施例中，选择一组乘法器{xi = 2＆eta; i ELEMENT M}。 通过将比例因子除以xi，将量化系数乘以{xi}并将标记数据添加到非零修改的量化系数来修改每个三元组。 在替代实施例中，通过比特流数据的两个特征来表示水印数据。 选择霍夫曼表用于编码不是通常使用的表的比例因子带接收水印数据。 根据任何期望的方案设置水印数据位，并且使用替代霍夫曼表导出量化系数。 在另一个实施例中，水印与量化集成。 因此，水印难以去除而没有可察觉的影响。 标记数据存在的事实再次由比特流数据的特征指示。 修改因子{xi}现在都接近于一致。