Methods and apparatus for embedding watermarks

专利名称：Methods and apparatus for embedding

watermarks

发明人：Venugopal Srinivasan申请号：US13283271申请日：20111027公开号：US083515B2公开日：20130108

专利附图：

摘要：Methods and apparatus for embedding a watermark are disclosed. An examplemethod disclosed herein to embed a watermark in a compressed data stream comprisesobtaining a set of transform coefficients included in the compressed data stream, the set

of transform coefficients having a respective first set of mantissa codes and a respectiveset of exponents, the first set of mantissa codes associated with a respective set ofmantissa step sizes, identifying a first transform coefficient from the set of transformcoefficients having a smallest magnitude among the set of transform coefficients,determining a second set of mantissa codes based on the first transform coefficient andthe set of step sizes, and replacing the first set of mantissa codes included in the

compressed data stream with the second set of mantissa codes to embed the watermarkwithout uncompressing the compressed data stream.

申请人：Venugopal Srinivasan

地址：Palm Harbor FL US

国籍：US

代理机构：Hanley, Flight & Zimmerman, LLC

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