Watermark embedding method based on DCT subband image characters
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United States of America Patent
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Mar 27, 2007
Grant Date -
Jan 27, 2005
app pub date -
Nov 5, 2003
filing date -
Jul 22, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A watermark embedding method based on DCT subband image characters is disclosed. An original image is converted into a frequency image using a discrete cosine transformation. The watermark information is then embedded into a specific embedding block in each macro-block of the frequency image. The method has the following advantages: (1) the image embedded by watermark is resistant from distortion and damages from compressions; (2) the watermark image can be extracted without employing the original image; and (3) the quality of the image embedded with the watermark image can remain intact.
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