| Summary: | 碩士 === 國立屏東教育大學 === 資訊科學系 === 98 === Data hiding, which embeds secret data into cover media, is one kind of technologies to achieve the multimedia security. Especially, reversible data hiding has the characteristic that the cover media can be completely reconstructed after the secret data are extracted. Recently, some reversible hiding schemes have focused on the vector quantization (VQ)-compressed format. Using the modified fast correlation vector quantization (MFCVQ) concept, Lu et al. proposed a reversible data hiding scheme for VQ-indexes tables. In this thesis, we propose two methods to improve their MFCVQ-based scheme. Our methods enlarge the embedding capacities by embedding multiple bits into a VQ index, and reduce the compression rate by applying the Huffman-code concept and the 0-centered classification. Experimental results show that embedding capacities and compression rates are improved by both of our methods.
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