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Hiding technology based on digital video streaming

Author: ZhongLiang
Tutor: WangXiaoMing
School: South China Normal University
Course: Computer Software and Theory
Keywords: Video hiding technology Steganography Similarity Motion vector Motion compensation
CLC: TP309
Type: Master's thesis
Year: 2005
Downloads: 141
Quote: 1
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Abstract


In recent years , the emergence of a large number of digital video products , the market demand for video digital products copyright protection increasingly urgent , also special video security communications requirements . Although some appeared on video hidden technology applied research , but most of the work has focused on copyright protection , digital watermarking digital watermarking , however , limitations due to its own characteristics , so that hidden are rarely secret communication can not meet some of the large amount of data and information access control requirements , therefore, how to achieve a high data hiding amount of video algorithm having the significance of these applications demand . In this paper, a detailed analysis of the three main types of video hidden technology , according to the first-generation system MPEG MPEG-2 encoding technology and second-generation MPEG-4 encoding technology characteristics , as well as the structural characteristics of the MPEG system stream a practical -based video streaming hidden algorithms and verified by experimental analysis . On the basis of the experimental results show that the algorithm in the video quality is not cause greater to achieve the accurate extraction of to hide big improvement on the amount of hidden data . Analysis existing watermark algorithm based on the absorption based on motion vector the hidden embedded ideology algorithm in order to avoid a greater impact caused due to the improper operation of the motion vector prediction in the video image , so the motion vectors choice appropriate adjustments , to ensure the consistency of the changes of the same object motion vectors . Meanwhile , according to the characteristics of the image structure of the MPEG system , in the DCT block of the image types adaptive hidden into the data. Because each data embedding will bring about the change in the length of the stream , as far as possible to reduce this variation , use of the flexibility of the structure of the system stream , the DCT data stream changes in the size and the motion vector of the block code stream size changes jointly controlled in a partial stream under the constraint condition , and meet video compression the stream consistent basis , to increase the effect of the amount of information hiding . Finally, for the realization of the hide the the accurate extraction algorithm , the introduction of the concept of the flag , making extraction algorithm can be more simple , fast , does not affect the the the normal extract video decoding playback speed .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality
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