H.264/AVC (advanced video coding) compressed domain robust video watermark embedding and extracting methods free from intra-frame error drift

A video watermarking, test.264 technology, applied in digital video signal modification, electrical components, image communication, etc., can solve problems such as increased computational complexity, low computational complexity, and error drift

Active Publication Date: 2015-04-29
NINGBO UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

There are mainly two types of methods for embedding watermarks in the compressed domain. The first type is the compressed domain watermarking method of joint encoding. When compressing a video stream, it is necessary to completely decode the original video and then jointly encode and embed the watermark, which is extremely complex; the second type is a compressed domain watermark method based on the video stream, which avoids the complicated encoding process and has low computational complexity. , but the watermark can only be embedded in the open loop, and the reconstruction value containing the watermark will cause prediction errors in the reconstruction of subsequent blocks, resulting in error drift
According to the processing me...

Method used

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  • H.264/AVC (advanced video coding) compressed domain robust video watermark embedding and extracting methods free from intra-frame error drift
  • H.264/AVC (advanced video coding) compressed domain robust video watermark embedding and extracting methods free from intra-frame error drift
  • H.264/AVC (advanced video coding) compressed domain robust video watermark embedding and extracting methods free from intra-frame error drift

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Embodiment 1

[0071] A H.264 / AVC compressed domain robust video watermark embedding method without intra-frame error drift proposed in this embodiment, its overall implementation block diagram is as follows Figure 1aAs shown, it judges whether the processed frame is an I frame at the watermark embedding end, and if so, enters the next judgment condition, otherwise, skips the frame; predictive coding of the macroblock in the slice in the processed I frame Mode to judge, if it is Intra_4×4, enter the next judgment condition, otherwise the macroblock does not embed watermark; for each 4×4 sub-block in the macroblock whose predictive coding mode is Intra_4×4, if a certain 4× The number of non-zero residual coefficients of the 4 sub-blocks and the total number of embedded watermark bits of the processed I frame all meet the embedding condition, then the watermark information is embedded by modulating the correlation between the residual coefficient matrix and the corresponding watermark template,...

Embodiment 2

[0092] This embodiment proposes an extraction method corresponding to the H.264 / AVC compressed domain robust video watermark embedding method without intra-frame error drift given in Embodiment 1. The overall implementation block diagram is as follows Figure 1b As shown, it includes the following steps:

[0093] ②-1. At the watermark extraction end, define the H.264 / AVC video stream embedded with watermark information as the target video stream, which is recorded as Test W .264.

[0094] ②-2. Analyze the target video stream Test in units of frames W .264, the target video stream Test W The frame to be parsed in .264 is defined as the current frame.

[0095]②-3. If the current frame is an I frame, then perform step ②-4; if the current frame is a P frame or a B frame, then perform no watermark extraction operation on the current frame, and then perform step ②-7.

[0096] ②-4. The current frame is parsed in units of slices, and the slice to be parsed in the current frame is ...

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Abstract

The invention discloses H.264/AVC (advanced video coding) compressed domain robust video watermark embedding and extracting methods free from intra-frame error drift. According to the video watermark embedding method, a residual coefficient matrix, whose number of non-zero residual coefficients is larger than the threshold, in a macro block with the predictive coding mode of Intra_4*4 in a frame I is analyzed, and then a watermark is embedded in a 4*4 sub-block of the macro block with the predictive coding mode of Intra_4*4 in the frame I by modulating the positive and negative correlation between the residual coefficient matrix and corresponding watermark template. The video watermark embedding method has the advantages as follows: the computation complexity is reduced, the video streaming code rate change after watermark embedding keeps stable, the error drift problem is solved, and the robustness of the compressed domain video watermark is further improved.

Description

technical field [0001] The invention relates to a video watermark technology, in particular to a method for embedding and extracting a robust video watermark in H.264 / AVC compression domain without intra-frame error drift. Background technique [0002] With the rapid development of network and multimedia technologies, operations such as video transmission and processing have become easier and easier. How to protect the legitimate rights and interests of video owners has become an urgent problem to be solved. Video watermarking technology is an effective means to solve this problem. The amount of video data is huge, and it is usually stored and transmitted in a compressed form. Traditional video watermarking algorithms need to completely decode the original video to embed and detect watermarks, and are not suitable for compressed videos. There are mainly two types of methods for embedding watermarks in the compressed domain. The first type is the compressed domain watermark...

Claims

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Application Information

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IPC IPC(8): H04N19/467H04N19/61
Inventor 李文锋蒋刚毅骆挺宋洋
Owner NINGBO UNIV
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