H.264 standard motion vector-based method for embedding and extracting fragile watermark

Abstract

The invention discloses an H.264 standard motion vector-based method for embedding and extracting a fragile watermark, which belongs to the technical field of information security. Watermark information is selectively embedded into the motion vector of a frame P in front of a frame I, so that watermark capacity and fidelity are high; the watermark information comprises a frame number and a time stamp, and is encrypted with a symmetric cryptographic algorithm, so that the watermark information has attack resistance and video tampering can be positioned at a certain accuracy; and an implementation process is performed in a compressed domain, computation complexity is low and the influence on a video coding bit rate is low.

Description

technical field [0001] The invention relates to a method in the technical field of information security, in particular to a method for embedding and extracting a fragile watermark based on the H.264 / AVC digital video codec standard motion vector. Background technique [0002] With the rapid development of computer communication technology, the popularization of Internet applications, and the digitization of information media, the release, dissemination, and exchange of digital images, music, and video works on the Internet are becoming more and more common. However, the characteristics of digital multimedia products that are easy to be copied and distributed without damage make it common to spread multimedia products in batches quickly and freely through the network. Digital watermark technology, as one of the technical means to effectively solve the digital copyright protection of information, has become a research hotspot in the field of information processing and informat...

AI Technical Summary

Problems solved by technology

[0005] After searching the existing technology, it is found that the Chinese Patent Document No. CN101854546, published on 2010-10-06, records "a video watermark embedding and extraction method based on H.264 motion vector", and the embedding position selected by this technology is P The motion vector of the frame, and the P frame number embedded in the watermark is determined by the pseudo-random sequence generated by the key, but the error accumulation of the P frame will affect the visual effect of the video to a certain extent

Chinese Patent Document No. CN101860744, published on 2010-10-13, describes a "real-time digital video watermarking method based on the H.264 standard". A part of the Network Abstraction Layer) is embedded with a digital watermark in the auxiliary enhanced information field, but because the embedding position is fixed, the watermark has certain defects in concealment and anti-attack

[0006] It can be seen from the above discussion that there are many optional positions for embedding watermarks in accordance with the H.264 standard, but how to avoid the impact on visual effects as much as possible and improve fidelity while ensuring the concealment and embedding capacity of watermarks is the key to video information. Hidden Technology Challenges

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