| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 100 === Protecting personal privacy on digital images and videos is important these days. In this research, we present a privacy protection mechanism in H.264/AVC videos. The private visual information on video frames is scrambled by processing the data in the compressed bitstream directly so that the private region is not visible to the regular users. Nevertheless, the scrambled region can be restored to the original content by authorized users. Basically, the scrambling is applied by extracting and removing some data from the H.264/AVC bitstream. These data will be embedded into the bitstream so that the recovery can be applied successfully by placing these data back. In other words, the de-scrambling is achieved via the methodology of information hiding. Since the H.264/AVC encoder makes use of the spatial and temporal dependency for reducing the data size, careless partial scrambling on H.264/AVC compressed bit-stream will result in the drift errors. To solve this problem, the restricted H.264/AVC encoding is employed to prevent the modified data from affecting the subsequent video content. Experimental results show that our method can effectively scramble the privacy region, which can be recovered by using the hidden information. In addition, the size of partially scrambled video is kept under good control.
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