Method for embedding and reading watermark-information in digital form, and apparatus thereof
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
Jan 27, 1998
filing date -
Jan 28, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for embedding information comprises: a blocking step for dividing data to be processed into blocks; an orthogonal transform step for obtaining coefficients by carrying out orthogonal transformation for each block; an embedding coefficient selecting step for determining coefficients in which the watermark-information will be embedded by using a random sequence which is generated by initial value; an information embedding step for sequentially embedding the watermark-information, which has arbitrary length of bits, by quantizing value of said coefficients using a predetermined value for quantization; and an inverse orthogonal transform step for carrying out inverse orthogonal transformation for modified coefficients to form block in which the watermark-information is embedded, as well as combining the divided blocks and reconstructing the original form.
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