| Summary: | 碩士 === 東海大學 === 資訊工程學系 === 98 === In this thesis, we propose an enhanced, reversible, data hiding scheme based on modifying the differences between two neighboring pixels on grayscale image. We employed a dynamic scanning strategy to generate the best histogram of pixel differences. In order to decrease the distortion of the embedded image, we also considered the number of ‘0’ and ‘1’ for the binary secret data that will be embedded in the cover image. By the experimental results, the bit-rate of our proposed scheme has 32% more in ‘Lena’ image, 17% more in ‘Baboon’ image, 43% more in ‘Jet’ image, 4% more in ‘Pepper’ image, 47% more in ‘Goldhill’ image, and 7% more in Medical image than other schemes.
In addition, we also propose the reversible data hiding scheme on binary curve image. In order to reduce visual differences, we use the strategy of modifying column bits. We also ensure the continuity of the curve after embedding procedure. By the experimental results, the overhead information has just only 17 or 18 bits. Pearson Correlation Coefficient is nearly to 1, and the bit-rate is at least 0.59 in all experimental images. Hence, our scheme can achieve an ownership proof for proprietor without damaging the representative meaning of the curve.
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