| Summary: | 碩士 === 國立交通大學 === 多媒體工程研究所 === 95 === Three types of art images are created in this study, namely, irregular- hexagonal-tiled image, tile-overlapping mosaic image, and variable-sized mosaic image. Methods for automatic generation of these types of art images and data hiding in them are proposed. For irregular-hexagonal-tiled images, we find two features for information hiding, namely, two specific vertices and inner colors of tiles. We can hide secret messages and watermarks into images by adjusting the locations of the two specific vertices and modifying the inner colors of hexagons. The methods may be used for secret communication and copyright protection. For tile-overlapping mosaic images, we utilize the overlapping pixels of adjacent tile images to implement the data hiding work. We can hide zero to seven bits into a pair of tile images by changing the overlapping degrees of adjacent tile images. For variable-sized mosaic images, we utilize two sizes of tile images to implement the data hiding work. We hide data bits into the tile images by changing the sizes of them dynamically without creating overlapping areas in the resulting stego-image. Experimental results show the feasibility of the proposed methods and their applications for data hiding and watermarking.
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