Watermark embedding method based on DCT subband image characters
    1.
    发明授权
    Watermark embedding method based on DCT subband image characters 失效
    基于DCT子带图像字符的水印嵌入方法

    公开(公告)号:US07197163B2

    公开(公告)日:2007-03-27

    申请号:US10700549

    申请日:2003-11-05

    IPC分类号: G06K9/00

    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。

    Watermark embedding method based on DCT subband image characters
    2.
    发明申请
    Watermark embedding method based on DCT subband image characters 失效
    基于DCT子带图像字符的水印嵌入方法

    公开(公告)号:US20050018872A1

    公开(公告)日:2005-01-27

    申请号:US10700549

    申请日:2003-11-05

    IPC分类号: G06K9/00 G06T1/00

    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。