A Fragile Watermark Embedding and Detection Method for MPEG-2 Compressed Domain Video
An MPEG-2, fragile watermarking technology, applied in the direction of digital video signal modification, image communication, selective content distribution, etc. The effect of good performance and low computational complexity
Active Publication Date: 2018-11-23
安徽天虹数码科技股份有限公司
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[0008] However, the fragile watermark in the non-compressed domain and the fragile watermark in the encoded domain need to decode the compressed video information first, and re-encode after embedding the watermark, which not only reduces the video quality, but also has complex calculations, which does not meet the real-time performance of video stream transmission.
The existing fragile watermarks in the compressed domain mainly embed watermarks by modulating motion vectors or mid- and low-frequency DCT coefficients, modifying video information, and there are problems such as real-time performance and video quality loss.
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[0045] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0046] A method for embedding a fragile watermark in an MPEG-2 compressed domain video, comprising the following steps:
[0047] (1) Utilize the MPEG-2 decoder to analyze the MPEG-2 video code stream according to the MPEG-2 video encoding standard, set the I frame video to have N macroblocks, then first count the luminance block Y in the ith 8x8 macroblock The number of non-zero coefficients Y after the component is transformed by DCT and quantized i , where, i=1, 2, ..., N; then according to Y i Calculate the number of non-zero coefficients M of the luminance block Y components in N macroblocks after DCT transfo...
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The present invention discloses a fragile watermark embedding and detection method of an MPEG-2 compressed domain video. An MPEG-2 decoder is employed to analyze the MPEG-2 video code flow according to the MPEG-2 video coding standard, the nonzero coefficient number of a brightness block Y component, a chroma block U component and a V component through DCT transformation and quantification are subjected to statistics according to the macro-block data of the I-frame video, the energy difference statistical value of the brightness block Y component is calculated according to the mapping relation; and the binary system watermarking information is generated through the Arnold transformation to embed the video code flow. The fragile watermark embedding and detection method of an MPEG-2 compressed domain video generates watermarking according to the video macro block to provide reliable watermarking embedding and detection for MPEG-2 digital products and is able perceive tiny attack; the watermarking embedding detection based on the compressed domain has no influence on the video quality, the calculation complexity is low, and the timeliness is good; and the fragile watermark embedding and the detection method of MPEG-2 compressed domain video performs watermarking detection with no need for original video and belongs to a blind watermarking method.
Description
technical field [0001] The invention relates to a fragile watermark in the video compression domain, in particular to a video fragile watermark embedding and detection method in the MPEG-2 compression domain. Background technique [0002] Video fragile watermarking technology is an important branch in the research field of information hiding technology. The rapid development of computer multimedia technology facilitates the storage, editing, and transmission of multimedia information such as video, but also raises the issue of transmission security and copyright protection of multimedia information. How to prevent illegal tampering and forgery of multimedia information and ensure data integrity makes video fragile watermarking a research hotspot in the field of multimedia information security. [0003] MPEG-2 is a video and audio lossy compression standard formulated by the MPEG organization. It is especially suitable for the encoding and transmission of broadcast-quality d...
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IPC IPC(8): H04N19/467H04N19/89H04N21/8358
CPCH04N19/467H04N19/89H04N21/8358
Inventor 张进王满海班楚凡廖亮亮朱露露曹阳
Owner 安徽天虹数码科技股份有限公司