Original document(15 pages)  中文版
    The present invention relates to a method, apparatus and computer program product enabling at least identification the presence data symbols that have been embedded in a media signal. A transmitted media signal is obtained (step 22), which comprises a possibly distorted version of a host signal in which data symbols have been embedded by quantisation using a certain quantisation step size and to which dither with a set of dither values has been added. Several dither value intervals within the set are provided, where each interval corresponds to one dither value (step 26). A histogram is determined for each interval (step 30), where a histogram is determined for all sample values of a set of signal samples of the transmitted media signal and having a dither value in the corresponding interval. The separate histograms are combined and a rescaling factor is determined based on the combined histogram (step 32) in order to estimate the quantisation step size.
Application Number
申请号		 200480038244 Application Date
申请日		 2004.12.07
Title 名称 Estimation of quantisation step sizes for a watermark detector
Publication Number
公开号		 1910609 Publication Date
公开日		 2007.02.07
Approval Pub. Date Granted Pub. Date
International Classification 分类号 G06T1/00
Applicant(s) Name
申请人		 Koninkl Philips Electronics NV
Address 地址
Inventor(s) Name 发明人 Kalker Antonius A. C. M.
Attorney & Agent 代理人 cheng tianzheng wang zhongzhong
More information 更  多  信  息


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