Watermark embedding method, watermark extracting method, device and system
A technology of watermark embedding and watermark information, which is applied in the direction of TV, electrical components, digital video signal modification, etc., can solve the problems of narrow bandwidth, small channel capacity, and inability to carry watermark information, etc., and achieve the effect of resisting influence
Inactive Publication Date: 2012-08-08
HUAWEI TECH CO LTD
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If the P frame and B frame are regarded as channels, and the watermark signal embedded in the P frame and B frame is regarded as a signal, then for the watermark signal, the channel becomes a residual signal, and the bandwidth of the channel becomes smaller due to compression. According to Shannon's theorem, the channel capacity will become smaller at this time, and the amount of watermark information that can be transmitted by the entire communication system will also be reduced. Even because the residual signal is too small to carry watermark information, the existing video watermark The solution cannot effectively solve the impact of video compression on the watermark signal
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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0044] The embodiment of the present invention proposes a robust video watermarking scheme based on energy features, which takes the energy pairs of processed strips in the original uncompressed video frame as embedding objects, and can robustly embed multi-bit information in the same frame. It is simple, has high practicability, and has high security.
[0045] figure 1 A schematic flow chart of the watermark embedding method provided by the embodiment of the pre...
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The embodiment of the invention discloses a watermark embedding method, a watermark extracting method and device and system, the watermark embedding method comprises dividing strips of an original video frame into multiple strip sets of each including at least two strips; regulating middle / high frequency coefficients of the strip set according to watermark information to conform a high-frequency energy size relationship among strips of the strip set with the preset condition; each strip includes multiple sub-blocks. The technological solution embeds the watermark through the energy of the strip set of the original video frame, the watermark embedding method provided in the embodiment of the invention can effectively resist the effect of a video compression strip in that the main information in the original video frame has small change before or after the compression.
Description
technical field [0001] The invention relates to the technical field of digital watermarking, in particular to a watermark embedding method, a watermark extraction method, a device and a system. Background technique [0002] With the wide application of computer and network technology, digital multimedia information is widely used and can be transmitted conveniently and quickly. The copyright protection of digital media and the prevention of data leakage are also a hot spot of social concern. Although traditional encryption and decryption can effectively protect the copyright of digital media by controlling user access and use. However, once the multimedia content is decrypted, illegal use of the decrypted multimedia content cannot be controlled. The emerging digital watermarking technology in recent years can effectively solve this problem. [0003] Digital video watermarking is to embed an unknown signal in the video. By extracting this signal, functions such as copyrigh...
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IPC IPC(8): H04N7/26H04N19/174H04N19/467H04N19/48
Inventor 张永平郝韬
Owner HUAWEI TECH CO LTD