Apparatus and method of processing image data, transmission medium, and recording medium
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United States of America Patent
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Jun 11, 2002
Grant Date -
N/A
app pub date -
Sep 1, 1998
filing date -
Sep 2, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to an apparatus and a method of processing an image data, a transmission medium, as well as a recording medium. In detail, in an image data processing of processing an image data in which an accompany information is embedded as a watermark, having a memory which stores the patterns of the watermark, setting a phase of a pattern of the watermark being stored in the memory, to a first phase or a second phase, calculating a first evaluation value corresponding to a pattern of the watermark of the first phase, of the image data inputted, and a second evaluation value corresponding to a pattern of the watermark of the second phase, and comparing the first evaluation value, and a value corresponding to the second evaluation value. As a result, it makes possible to read the accompany information more securely.
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