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Spread spectrum watermark for embedded signalling 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • H04L-009/00
출원번호 US-0708331 (1996-09-04)
발명자 / 주소
  • Cox Ingemar J.
출원인 / 주소
  • NEC Research Institute, Inc.
대리인 / 주소
    Feig
인용정보 피인용 횟수 : 396  인용 특허 : 0

초록

A watermark is embedded into audio/video/image/multimedia data using spread spectrum methodology. The watermark is extracted from watermarked data without the use of an original or unwatermarked version of the data by using spatial or temporal local averaging of the frequency coefficients of the wat

대표청구항

[ What is claimed is:] [1.] A method of extracting a watermark from watermarked data comprising the steps of:receiving watermarked data;spectrum normalizing the watermarked data to generate a normalized signal;correlating the normalized signal with predetermined PN sequences corresponding to predete

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  340. Hunter, Charles Eric; Ballou, Jr., Bernard L.; Summer, Robert D.; Sparks, Kelly C.; Sykes, Ollin B.; Hebrank, John H., System and method permitting customers to order products from multiple participating merchants.
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