公开(公告)号：US20050175110A1

公开(公告)日：2005-08-11

申请号：US10477491

申请日：2002-05-15

申请人： Marten Van Dijk ,  Franciscus Maria Willems

发明人： Marten Van Dijk ,  Franciscus Maria Willems

IPC分类号： H03M13/19 ,  G11B20/00 ,  G11B20/18 ,  H04L1/00 ,  G06F19/00 ,  G01N33/48 ,  G01N33/50 ,  H04B14/04

CPC分类号： G11B20/00891 ,  G11B20/00 ,  G11B20/00086 ,  G11B20/18

摘要： Information signals such as grayscale images or audio signals are represented as a sequence of PCM signal samples. To embed auxiliary data in the least significant bits of the signal, the samples are slightly distorted. There is a so-termed “rate-distortion function” (20) which gives the largest embedding rate R given a certain distortion level D. It appears that the efficiency of prior art embedding schemes such as LSB replacement (21,22) can be improved. The invention discloses such embedding schemes (23,24). According to the invention, the signal is divided into groups of L (L>1) signal samples (x). For each group of signal samples, a vector of least significant portions (x mod n) of the signal samples is created. For n=2, the vector comprises the least significant bit of each signal sample. The syndrome of said vector (as defined in the field of error detection and correction) represents the embedded data. Only one (or a few, in any case less than L) signal sample(s) of a group needs to be modified so as to achieve that the vector assumes a desired syndrome value.

摘要翻译： 诸如灰度图像或音频信号的信息信号被表示为PCM信号样本的序列。 为了将辅助数据嵌入到信号的最低有效位中，样本稍微失真。 存在所谓的“速率失真函数”（20），给出给定一定的失真水平D的最大嵌入速率R.看起来，诸如LSB替换（21,22）的现有技术嵌入方案的效率可以是 改进。 本发明公开了这种嵌入方案（23,24）。 根据本发明，信号被分成L（L> 1）个信号样本（x）的组。 对于每组信号样本，产生信号样本的最低有效部分（xmod n）的向量。 对于n = 2，矢量包括每个信号样本的最低有效位。 所述向量（如在错误检测和校正领域中定义的）的综合表示嵌入数据。 需要修改组中只有一个（或少数在任何情况下小于L个）信号样本），以便实现矢量呈现期望的综合征值。

公开(公告)号：US20050219080A1

公开(公告)日：2005-10-06

申请号：US10517922

申请日：2003-06-11

申请人： Antonius Adrianus Cornelis Kalker ,  Franciscus Maria Willems

发明人： Antonius Adrianus Cornelis Kalker ,  Franciscus Maria Willems

IPC分类号： G06T1/00 ,  H04N1/32 ,  H04N1/387 ,  H03M7/00

CPC分类号： G06T1/0028 ,  G06T2201/0083 ,  G06T2201/0203 ,  H04N1/32144 ,  H04N1/32347

摘要： An undesirable side effect of watermarking or data-hiding schemes is that the host signal is distorted. This invention discloses a reversible or lossless data-hiding scheme, which allows complete and blind (without additional signaling) reconstruction of the host signal (X). This is achieved by accommodating, in the embedded data (d) of the watermarked signal (Y), restoration data (r) that identifies the host signal, given the composite signal, i.e. the restoration data identifies (24) which modifications the host signal has undergone during embedding (23). The restoration data is accommodated in a portion of the embedding capacity of a conventional embedder (23). The remainder of the capacity is used for embedding payload (w).

摘要翻译： 水印或数据隐藏方案的不良副作用是主机信号失真。 本发明公开了一种可逆或无损数据隐藏方案，其允许主机信号（X）的完整和盲（重新信令）重建。 这通过在给定复合信号的情况下适应水印信号（Y）的嵌入数据（d），识别主机信号的恢复数据（r）来实现，即恢复数据标识（24），其修改主机信号 在嵌入过程中经历了（23）。 恢复数据被容纳在常规嵌入器（23）的嵌入容量的一部分中。 容量的剩余部分用于嵌入有效载荷（w）。