| Summary: | 碩士 === 玄奘大學 === 資訊科學學系碩士班 === 96 === A (t,n) secret image sharing scheme shares an image into n shared images for n participants and the original secret image can be reconstructed by k shared images. However, the reconstructed secret image in a traditional secret image scheme is always lossy due to the prime number selection and each participant has the same possessing weight. Therefore, the thesis overcomes these two drawbacks. First, pixel grey levels are modulated step by step to prevent grey level larger than 250. Second, a two-layered structure provides different weight on each participant. The equal weighted shared images in first layer are differently weighted in second layer. Experimental results demonstrate that the hybrid method overcomes these two drawbacks efficiently.
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