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1.
公开(公告)号:US07197163B2
公开(公告)日:2007-03-27
申请号:US10700549
申请日:2003-11-05
申请人: Guo-Zua Wu , Yi-Jung Wang , Zu-Wen Chao , Chwan-Chang Chen
发明人: Guo-Zua Wu , Yi-Jung Wang , Zu-Wen Chao , Chwan-Chang Chen
IPC分类号: G06K9/00
CPC分类号: G06T1/005 , G06T2201/0051 , G06T2201/0052 , G06T2201/0061
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.
摘要翻译: 公开了一种基于DCT子带图像字符的水印嵌入方法。 使用离散余弦变换将原始图像转换成频率图像。 然后将水印信息嵌入到频率图像的每个宏块中的特定嵌入块中。 该方法具有以下优点:(1)水印嵌入图像不受扭曲破坏和压缩损坏; (2)可以在不使用原始图像的情况下提取水印图像; 和(3)嵌入水印图像的图像的质量可以保持不变。
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2.
公开(公告)号:US20050018872A1
公开(公告)日:2005-01-27
申请号:US10700549
申请日:2003-11-05
申请人: Guo-Zua Wu , Yi-Jung Wang , Zu-Wen Chao , Chwan-Chang Chen
发明人: Guo-Zua Wu , Yi-Jung Wang , Zu-Wen Chao , Chwan-Chang Chen
CPC分类号: G06T1/005 , G06T2201/0051 , G06T2201/0052 , G06T2201/0061
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.
摘要翻译: 公开了一种基于DCT子带图像字符的水印嵌入方法。 使用离散余弦变换将原始图像转换成频率图像。 然后将水印信息嵌入到频率图像的每个宏块中的特定嵌入块中。 该方法具有以下优点:(1)水印嵌入图像不受扭曲破坏和压缩损坏; (2)可以在不使用原始图像的情况下提取水印图像; 和(3)嵌入水印图像的图像的质量可以保持不变。
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