WATERMARKING METHOD, WATERMARK CHECKING METHOD, WATERMARKING DEVICE, AND WATERMARK CHECKING DEVICE
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United States of America Patent
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Issued Date -
Dec 17, 2009
app pub date -
Jun 29, 2007
filing date -
Jun 30, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A watermarking method is provided. The method includes: the steps of creating an entire watermark for an image frame by using a secret key; dividing an image frame of the digital image file into divided frames by at least one row and at least one column; applying a predetermined watermark creating algorithm to pixel data of each divided frame to generate a unit watermark; and applying the unit watermarks with the digital image file. The step of creating the unit watermark uses a public key or applies a keyless algorithm. Another watermarking method includes the steps of dividing the image frame into a plurality of divided frames, each divided frame partially overlapping neighboring divided frames; applying a predetermined watermark creating algorithm to pixel data of each divided frame to generate a unit watermark; and applying the unit watermarks with the digital image file. With the watermarking method and the checking method, a forged or faked area of the image frame can be detected without increasing the amount of computation.
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