Modified spread-transform dither modulation

摘要：

According to the correlation between adjacent blocks of the carrier image， two algorithms, called STDM-COMW and STDM-PCO-MW, are proposed. By using the quantization step calculated from the previous secondary block to modulate the latter secondary block, STDM-CO-MW solves the problem of the difference of quantization step between embedding and decoding. In order to raise the correlation between adjacent secondary blocks, STDM-PCO-MW exchanges the pixels between the previous secondary block and the latter one before embedding.As a result STDM-PCO-MW is more robust. Thanks to the quantization step calculated above based on modified Watson model , we find that the quantization step of our algorithms varies linearly with the brightness of the carrier image adaptively .From the results of numerical simulation, it is obvious that our proposed algorithms are robust to JPEG compression, Gaussian noise and gain attack. Compared with AQIM and general STDM based on Watson model, our algorithms have a great improvement in performance.

关键词： Digital watermark Quantization index modulation visual model Spread-transform dither modulation

作者: YifengZhang ChengweiJia ZhengkangXu Kai Wang Wenjiang Pei

作者单位: School of Information Science and Engineering, SoutheastUniversity, Nanjing 210096, China

会议类型: 国际会议

会议名称: 2011年无线通信与信号处理国际会议(WCSP 2011)

会议地点: 南京

会议语种:英文

页码: 1-5

在线出版日期: 2011-11-09（万方平台首次上网日期，不代表论文的发表时间）