Counteracting geometric distortions in watermarking
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United States of America Patent
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Oct 3, 2006
Issued Date -
N/A
app pub date -
Aug 22, 2001
filing date -
Nov 18, 1993
priority date (Note) -
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Abstract
A digital watermarking method receives multimedia data, such as images or audio, in compressed or uncompressed form, and extracts a digital watermark while counteracting geometric distortions. To counteract geometric distortion, a watermark reading process translates the data before extracting the digital watermark. The reading process operates on compressed data such as JPEG or MPEG images, which are comprised of compressed blocks of image data.
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