Multiwavelet-based Image Watermarking Using Coding Scheme
碩士 === 清雲科技大學 === 電機工程所 === 99 === A wavelet-based watermarking process utilizing improved channel coding techniques is proposed. The image is decomposed by discrete wavelet transform (DWT) and the watermarks are embedded in sub-blocks of the third level by adjusting the coefficients. After data per...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/29439290793891792815 |
| Summary: | 碩士 === 清雲科技大學 === 電機工程所 === 99 === A wavelet-based watermarking process utilizing improved channel coding techniques is proposed. The image is decomposed by discrete wavelet transform (DWT) and the watermarks are embedded in sub-blocks of the third level by adjusting the coefficients. After data permutation, the watermark tenacity is enhanced by the fault tolerance ability of the convolutional coding schemes. An improved coding structure is presented to obtain double watermark information without increasing the embedded data. Robustness of the watermark can then be increased. The normalized correlation is used to evaluate the correctness of the watermarks that are retrieved from the compressed watermarked images, noise corrupted images and images filtering. Experiment results demonstrate the excellence of the watermarking technique.
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