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Reversible video frequency watermark method based on interframe forecast error histogram modification

An inter-frame prediction and prediction error technology, applied in the field of reversible video watermarking based on inter-frame prediction error histogram modification, to achieve the effect of improving embedding capacity, improving prediction accuracy, and good adaptability

Inactive Publication Date: 2011-03-02
BEIHANG UNIV
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Problems solved by technology

Therefore, it is not the most efficient way to process video frames exactly as static images

Method used

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  • Reversible video frequency watermark method based on interframe forecast error histogram modification
  • Reversible video frequency watermark method based on interframe forecast error histogram modification
  • Reversible video frequency watermark method based on interframe forecast error histogram modification

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Embodiment Construction

[0048] The overall frame diagram of the inventive method is as figure 1 shown. The overall process includes two parts: watermark embedding and watermark extraction. The watermark embedding process is shown in the dotted line box on the left side of the figure. It is carried out in reverse order. First, the motion estimation of the previous frame is used to obtain the inter-frame prediction error, and then the histogram of the inter-frame prediction error is modified to embed the watermark. The watermark extraction process is shown in the dotted line box on the right side of the figure. It is carried out in a sequential manner. The motion estimation of the previous frame is also used to obtain the prediction error, and then the watermark is extracted according to the prediction error and the histogram is modified to restore the frame image.

[0049] The watermark embedding process in the method of the present invention is as figure 2 As shown, for the target I frame where th...

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Abstract

The invention relates to a reversible video frequency watermark method based on interframe forecast error histogram modification, comprising watermark embedding and watermark detection. The watermark embedding process is carried out according to a video frequency negative sequence: firstly, utilizing the previous frame to carry out motion estimation to obtain an interframe forecast error, and then carrying out the histogram modification on the interframe forecast error so as to embed a watermark. An extracting process is carried out according to a video frequency sequence mode: similarly, utilizing the previous frame to carry out the motion estimation to obtain a forecast error, and then extracting a watermark from the forecast error, and modifying a histogram to carry out the frame imagerecovery. The invention uses the mode of negative sequence embedding and sequence extracting, thereby an embedded video frequency frame can be recovered after the watermark is extracted, and the reversibility of the video frequency watermark is realized; the motion estimation is used according to the content relation of adjacent interframes to carry out prediction so as to enable the forecast error histogram to have the height centrality, and realize the bigger embedding content; in the embedding process, using the histogram modification enables that the influence on the frame image is small, and a watermark-embedded video frequency has high visual quality.

Description

technical field [0001] The invention relates to a multimedia digital watermark embedding and detection method, in particular to a reversible video watermark method based on inter-frame prediction error histogram modification. Background technique [0002] The digital information revolution has brought profound changes to human society and life, as well as new challenges and opportunities for innovation. Since digital multimedia works are easily copied or modified, security issues such as digital copyright protection and content integrity verification have become urgent problems to be solved. Digital watermarking technology is an effective means to protect the security of digital multimedia. It hides some information in digital images, video or audio signals, and is used to declare copyright or verify the integrity of content. In most of the existing digital watermarking methods, due to the introduction of the watermark signal, the host media will be permanently changed and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32H04N7/16H04N19/159H04N19/467
Inventor 刘骁陈真勇曾骁范围罗立新熊璋
Owner BEIHANG UNIV
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