A h.264/avc video format compatible encryption method based on cavlc encoding
A technology of video format and encryption method, applied in encryption devices with shift register/memory, digital video signal modification, selective content distribution, etc., can solve the problem of unsatisfactory controllable adjustment, complex media data structure, and privacy leakage. and other problems, to achieve the effect of good protection and reduce the risk of video content leakage
Active Publication Date: 2021-04-16
SUN YAT SEN UNIV
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Problems solved by technology
These unencrypted structural information are likely to lead to privacy leaks
Due to the complex structure of compressed and encoded media data, the context is often highly correlated, and the encoding standards used by different media data formats are not the same; at the same time, issues such as encoding efficiency and encryption time need to be considered. Encrypting structured information is a difficult task
Encrypted airspace and time domain related parameters provide a global lightweight protection; it cannot meet the needs of different application scenarios for controllable adjustment of the region of interest and special local protection
Method used
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[0050] like figure 1 , is a flow chart of compatible encryption of the H.264 / AVC video format based on CAVLC encoding in the method of the present invention. Among them, the implementation framework of encryption is as follows: figure 2 As shown, the block of interest and the randomly selected block are encrypted first, and they are placed after the partially encrypted remaining blocks as additional information to obtain the encrypted video stream. The specific steps are as follows:
[0051] (1) video data is grouped, specifically, video block data is grouped in the following manner:
[0052] ① Select different detection algorithms according to different application scenarios, such as face detection, locate the blocks belonging to the region of interest in the video, and record the set of these interest blocks as R; in addition, use Mp in R 1 Record the location information corresponding to the block of interest. specifically
[0053] MP 1 is a sequence consisting of 0 ...
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The present invention provides a compatible encryption method for H.264 / AVC video format based on CAVLC encoding. The method directly processes the compressed code stream, firstly groups it according to the video block information, and performs a grouping of interest blocks and random blocks among them. Carry out encryption, put it at the end of the code stream as additional information, and then partially encrypt the data in the remaining blocks to organize it into a new video with a smaller resolution; add additional information to obtain the encrypted code stream. This method encrypts the time domain, space domain and structural information of the video, reduces side information leakage, and strengthens the protection of video content. The method of the invention can provide special protection for the region of interest, and can be adapted to different application scenarios. At the same time, it also retains the ability to detect and process encrypted videos, and can provide assistance for applications such as video monitoring systems and cloud storage.
Description
technical field [0001] The invention relates to the field of multimedia information security, in particular to a CAVLC coding-based H.264 / AVC video format compatible encryption method. Background technique [0002] In recent years, with the development of multimedia technology, people pay more and more attention to related technologies of video content and privacy protection. Compared with image data, video data has the characteristics of large volume and strong correlation between image frames. Generally speaking, videos are compressed and encoded for easy storage and transmission. This makes encryption on video different from ordinary encryption, for example, usually encrypting video content while maintaining its format compatibility. How to balance security, format compatibility, and other requirements of application scenarios is a challenge for video encryption technology. [0003] For compressed video code streams, existing methods mainly encrypt related parameters i...
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IPC IPC(8): H04N21/2347H04N21/4405H04N21/4408H04N19/13H04N19/167H04N19/176H04N19/159H04L9/06
CPCH04L9/0631H04N21/2347H04N21/4405H04N21/4408H04N19/13H04N19/159H04N19/167H04N19/176
Inventor 郑培嘉郭剑艇黄继武
Owner SUN YAT SEN UNIV