Method and device for embedding and authenticating watermark
A technology of watermark embedding and authentication method, applied in the multimedia field, can solve problems such as inability to perform watermark authentication, inability to reconstruct watermark information, and changing the rate-distortion cost of video images.
Inactive Publication Date: 2009-07-01
HUAWEI TECH CO LTD
View PDF0 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
If the video image embedded with watermark information is compressed once with the above-mentioned video compression standard (i.e. secondary compression), the embedded watermark causes image distortion and changes the rate-distortion cost of the video image, correspondingly , the coding mode of the macroblock has also changed at this time, so that the watermark information cannot be correctly reconstructed according to the low-frequency energy difference relationship of the macroblock, and watermark authentication cannot be performed
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0041] In order to solve the problem that the watermark authentication technology in the prior art cannot resist lossy compression, an embodiment of the present invention provides a watermark embedding method and a watermark authentication method. Such as figure 1 As shown, the watermark embedding method includes the following steps:
[0042] 101. Extracting anti-compression feature values from image information as watermark information; the present invention utilizes the energy relationship between macroblocks to construct anti-compression feature values of video content.
[0043] 102. Embedding the watermark information into the image information by using a robust watermarking method.
[0044] Such as figure 2 As shown, the watermark authentication method includes the following steps:
[0045] 201. Extracting anti-compression feature values from image information as reconstructed watermark information;
[0046] 202. Extract embedded watermark information from the ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method and a device for embedding watermarks, and a method and a device for authenticating watermarks, and belongs to the field of the watermark authentication. The embedding method comprises the flowing steps: taking the characteristics of anti-compression videos, which are extracted from image information, as watermark information; embedding the watermark information in the image information through a robust watermarking method; taking the anti-compression characteristic value extracted from the image information as reconstruct watermark information when the authentication is conducted; extracting the embedded watermark information from the image information; utilizing the reconstruct watermark information and the embedded watermark information to conduct the authentication on the image information. The embodiment of the invention uses the anti-compression video content characteristics as watermark information and embeds the watermark information in the video through the robust watermarking method, so as to not only realize the watermark authentication, but also enable the watermark-reconstructed operation and the watermark-extracted operation on the video image not to be impacted by the compression process. In addition, the embodiment of the invention not only embeds the video or video content about the watermark information, but also resists the second compression.
Description
technical field [0001] The invention relates to the field of multimedia technology, in particular to an anti-compression watermark embedding method and device, and a watermark authentication method and device. Background technique [0002] With the popularization and development of multimedia technology and the Internet, a large number of digital media works such as videos, images, and audios have been disseminated on the Internet. Copyright protection and content authentication for them have become an urgent problem to be solved. Digital watermarking technology is the solution to this problem. Moreover, due to the huge amount of video image information, it must be compressed before it can be transmitted on the network, so the digital watermarking technology that can resist compression becomes quite important. [0003] The existing anti-compression digital watermarking technology mainly adopts the energy difference watermarking algorithm. This method embeds the watermark int...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H04N7/24G06T1/00H04N21/8358
Inventor 郝韬张永平
Owner HUAWEI TECH CO LTD