| Summary: | 碩士 === 國立臺北科技大學 === 電機工程系所 === 94 === Compared with the fixel size block size motion compensation in traditional vedio codec, the variable block size motion compensation in H.264/AVC can not only precisely represent the true motion activity in a macroblock, but also provide more positions for watermark embedding. In literature, most of watermarking techniques embedded watermarks in quantized discrete cosine transform coefficients, while the works related to embedding watermark in motion vector are few. In this thesis, we proposed a fragile video watermarking technique to embed information in motion vector by exploiting its the fragile nature. Based on the statistical analysis of the motion vector using the H.264 Rate-Distortion cost function, we can find out the best locations of motion vectors to embed the extracted feature of the previous video frame, and achieve the fragility. Our scheme does not need the original video sequence for watermark detection. Experimental results show that our watermarking technique can keep the perceptual quality at best effort and still has good fragility.
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