发明申请
- 专利标题: Embedding auxiliary data in an information signal
- 专利标题(中): 在辅助信息中嵌入辅助数据
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申请号: US10477491申请日: 2002-05-15
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公开(公告)号: US20050175110A1公开(公告)日: 2005-08-11
- 发明人: Marten Van Dijk , Franciscus Maria Willems
- 申请人: Marten Van Dijk , Franciscus Maria Willems
- 优先权: EP01201778.6 20010515
- 国际申请: PCT/IB02/01702 WO 20020515
- 主分类号: H03M13/19
- IPC分类号: H03M13/19 ; G11B20/00 ; G11B20/18 ; H04L1/00 ; G06F19/00 ; G01N33/48 ; G01N33/50 ; H04B14/04
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.
公开/授权文献
- US07392453B2 Embedding auxiliary data in an information signal 公开/授权日:2008-06-24