发明名称 |
Watermark embedding method based on DCT subband image characters |
摘要 |
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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申请公布号 |
US2005018872(A1) |
申请公布日期 |
2005.01.27 |
申请号 |
US20030700549 |
申请日期 |
2003.11.05 |
申请人 |
WU GUO-ZUA;WANG YI-JUNG;CHAO ZU-WEN;CHEN CHWAN-CHANG |
发明人 |
WU GUO-ZUA;WANG YI-JUNG;CHAO ZU-WEN;CHEN CHWAN-CHANG |
分类号 |
G06K9/00;G06T1/00;(IPC1-7):G06K9/00 |
主分类号 |
G06K9/00 |
代理机构 |
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代理人 |
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主权项 |
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