| Summary: | 碩士 === 中華大學 === 資訊工程學系(所) === 96 === Although digitalization and the Internet are very convenient and useful for
personal users and industry, they suffer from shortcomings of security. For
instance, private content is difficult to protect and fake versions of multimedia
data can be produced. Digital watermarking offers some effective
solutions. This work presents a video watermarking scheme that uses motion
vectors to define the place where the watermarks are embedded, and the
number of watermark bits vary dynamically among frames. Swarm intelligence
based Fuzzy C-means (FCM) clustering method is utilized to select the
motion vectors and the positions of the watermarks. The advantages of this
work are twofold. A novel watermarking strategy is presented that does not
require manual selection of watermark bits location. The number of embedded
motion vector clusters differs depending on the motion characteristics
in each frame. This significant property possesses higher security. As can
be concluded from the experimental results, the watermarked video retains
satisfactory quality with very small degradation.
key words: video watermarking, compressed video, motion vector, fuzzy Cmeans
clustering
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