H.264/avc compressed domain video encryption/decryption device and encryption/decryption method

Abstract

The invention discloses an H.264 / AVC (Advanced Video Coding) compressed domain video encryption / decryption device and an encryption / decryption method of the H.264 / AVC compressed domain video encryption / decryption device. The encryption / decryption device comprises a key generation module, a first judging module, a brightness 4*4 intra-frame prediction mode module, a second judging module and a brightness coding block mode scrambling module. The invention has the following advantages that: 1, the code stream structure is not destroyed to the benefit of network transmission, random access and compressed domain video processing (such as watermark addition and the like); 2, the code rate of the coding is not additionally increased; 3, the decoding probability is low, and video encryption and non-encryption can be switched in real time; and 4, the operating complexity is low.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a device for rapidly realizing H.264 / AVC compressed domain video encryption and an encryption method thereof, a device for rapidly realizing H.264 / AVC compressed domain video decryption and a decryption method thereof. Background technique [0002] While digital and networked video surveillance systems provide people with real-time and accurate visual information, they also bring many security risks. The monitored video images may involve state secrets and "sensitive information" as well as personal privacy. , and the illegal disclosure, tampering, and counterfeiting of these information may not only threaten the information security of the country's political, economic, military, cultural, ideological and other "sensitive" departments, but may also pose a great threat to personal privacy. Therefore, How to ensure the security of monitored multimedia information has beco...

AI Technical Summary

Problems solved by technology

One is to encrypt the video stream before compression encoding, but it is generally believed that this type of method will significantly change the source structure and syntax, and have a great impact on subsequent encoding efficiency

It is worth mentioning that the ideal Gaussian source encrypted first and then DSC (distributed source coding) compression algorithm proposed by foreign scholar Johnson can not only meet the data security requirements, but also have little impact on the compression gain. The ideal Gaussian information source is encrypted and then DSC compressed, and its coding efficiency is significantly reduced

This type of algorithm can choose to encrypt key data according to actual needs. The disadvantage is that the encryption strength and computational complexity are contradictory, and the encryption process has a great impact on the efficiency of subsequent entropy coding before entropy coding.

Images