H.264 compressed domain bit plane encryption method based on bit sensitivity
A bit-plane, high-sensitivity technology, applied in TV, pulse-modulated TV signal transmission, electrical components, etc., can solve problems such as difficulty in ensuring compatibility of standard codecs, inability to provide sufficient security, etc., to meet real-time requirements, high The effect of security and low computational complexity
Active Publication Date: 2012-06-27
中城芯(北京)科技有限公司
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However, these methods cannot guarantee that all encrypted bits are the most important data for video reconstruction quality, and it is difficult to ensure that the encrypted bitstream format is compatible with standard codecs
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[0034] Below in conjunction with accompanying drawing of description, specific embodiment of the present invention is described:
[0035] 1. About H.264 stream bit sensitivity test;
[0036] As mentioned above, the H.264 compressed bitstream contains various types of codewords, and their importance to video reconstruction quality varies. The purpose of the bit sensitivity test is to obtain information on the importance of various types of codewords in the code stream to the quality of video reconstruction. In order to more clearly reflect the impact on the quality of video reconstruction when bit errors occur in the codeword, we conducted a bit sensitivity test without enabling the H.264 codec error tolerance mode, that is, when the bit error in the codeword When a bit is corrupted, the H.264 decoder does not correct or hide the effect of the error, in which case the quality of the reconstructed video is tested. The test experiment uses standard video sequences in QCIF forma...
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The invention discloses an H.264 compressed domain bit plane encryption method based on bit sensitivity, which includes the H.264 code stream bit sensitivity testing step, the bit plane forming step and the bit plane encryption step. The encrypted bits are guaranteed to be the most important data for video reestablishing quality in the compressed code stream according to bit sensitivity information and the principle of the bit plane of the H.264 compressed code stream, so that computing is low in complexity, executing speed is high and the requirements of instantaneity of video application can be met. Compared with the conventional compressed domain video encryption method, the H.264 compressed domain bit plane encryption method is more purposeful, capable of guaranteeing higher safety on the condition of identical encrypted data quantity and keeping compatibility of an H.264 standard encoder and the code stream form after encryption and keeping the compression ratio of the code stream before and after encryption and constant and the like.
Description
technical field [0001] The invention relates to video encryption in the field of multimedia information security, in particular to an H264 compressed domain bit-plane encryption method based on bit sensitivity. Background technique [0002] With the wide application of multimedia communication systems such as e-commerce, video conferencing, video surveillance, telemedicine, and 3G smartphones, there are various security risks such as theft and malicious tampering of multimedia information such as images and videos during network transmission. Information security issues have become increasingly prominent. For example, in a variety of business applications, the theft of multimedia information will bring huge economic losses to suppliers; in the process of telemedicine, the leakage of patients' private information will cause the privacy of patients to be violated; especially Leakage of information from military, national defense, foreign affairs and other confidential departm...
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IPC IPC(8): H04N7/24H04N7/26H04N19/105H04N19/34H04N19/625H04N19/67
Inventor 卓力毛年胜赵霙頔张菁李晓光
Owner 中城芯(北京)科技有限公司