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Multicast Model and Application of Group Communication System using Trigger  

Ryu Kwon-Yeol (위덕대학교 게임소프트웨어학부)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.10, no.7, 2006 , pp. 1222-1228 More about this Journal
Abstract
In this paper, I propose a video watermaking method using adaptive threshold value and half-cell motion vector. Conventional method cause a lot of change of motion vectors and bring about a falling-off in invisibility, because it search embedding condition about whole macroblocks and watermarks are embedded in arbitrary motion vectors. Proposed method improve invisibility and decrease in number of change of motion vectors, because it create threshold value by using power of motion vector(PMV), and watermarks are embedded in motion vectors which greater than threshold value. Consequently, proposed method improve invisibility with on an average 5.4 dB ~9.3dB according to video bit-stream.
Keywords
video watermarking; motion vector; blind watermarking; adaptive threshold;
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