| Summary: | 碩士 === 大同大學 === 資訊工程學系(所) === 92 === A copyright protection scheme for gray-level images based on image secret sharing and wavelet transformation is proposed in this thesis. The scheme contains a secret image generation phase and a watermark retrieval phase. In the generation phase, the scheme extracts the features from a host image using the discrete wavelet transformation (DWT), and then uses the features and the watermark, a visually recognizable pattern, to generate the secret image using the image secret sharing (ISS). In the retrieval phase, the watermark is retrieved by combining the secret image and the features obtained from the suspect image. The retrieved watermark is then compared with the original watermark for checking copyright.
The experimental results show that the scheme can withstand 11 kinds of common image processing operations, including JPEG compression, varied noise adding, uniform noise adding, blurring, sharpening, averaging, brightness adjustment, contrast adjustment, scaling, cropping, and equalization.
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