Image analysis – Applications
Patent
1997-10-09
2000-08-15
Johns, Andrew W.
Image analysis
Applications
382248, G06K 900
Patent
active
061048267
ABSTRACT:
The present invention relates to methods for watermark-embedding/extracting identification information into/from picture data and apparatuses thereof. When identification information is watermark-embedded, the following steps are performed. Combinations of basis functions orthogonal each other are generated in association with each numerical signal. For each combination of the orthogonal basis functions, a weight coefficient is calculated so as to correspond to the combination of the basis functions by calculating a sum of products of values of the basis functions for pixels in the original picture data and pixel values of the pixels. For each numerical signal, a watermark-embedding function is referred, a input value is specified, and a pixel value is changed. When the identification information is extracted from the picture data, for each weight coefficient, the watermark-embedding function is referred, and the value of the watermark-embedding function is calculated for each weight coefficient.
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Kazui Kimihiko
Morimatsu Eishi
Nakagawa Akira
Tada Atsuko
Tanaka Koich
Fujitsu Limited
Johns Andrew W.
Nakhjavan Shervin
LandOfFree
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