Cryptography Reference
In-Depth Information
7.5 Summary and Conclusion
Resolving the tradeoff between maintaining picture quality and withstanding
video processing is a central problem in research on video watermarking. Pre-
viously reported video watermarking methods have trouble satisfying these
conflicting quality and survivability requirements because they simply uti-
lize watermarking methods for still pictures and neglect the motion picture
properties. The adaptive video embedding and detection techniques using mo-
tion picture properties described in this chapter resolve this tradeoff. The
motion-adaptive embedding technique uses criteria for measuring watermark
imperceptibility from motion vectors and deformation quantities, and the sta-
tistically adaptive detection technique controls accumulation using inferential
statistics so that the error rate of WMs is minimal. Experimental evalua-
tion using actual motion pictures showed that using these two techniques can
maintain picture quality and improve watermark survivability after MPEG
encoding. They are widely applicable to pixel-based watermarking.
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