| 摘要(英) |
In this thesis, we propose a novel watermarking system that is highly robust against attacks without perceptible image degradation. In addition, the original image is not needed in watermark extraction. It operates either in the DWT domain or the DCT domain. This system integrates three important ideas to provide extellent watermarking performance.
The first idea is to use a secret key that is generated based on the watermark logo and the host image. Based on the polarity of the transform coefficients and the key, the original watermark can accurately be extracted.
The second idea is to use subblock composition to filter out frequency transform blocks that are not suitable for watermark embedding. A Tri-state Exclusive-Or (TXOR) operator is then applied in qualified subblock to embed the watermark. This technique further improves the robustness.
The third idea is the deadzone shifting with human visual system. For watermark embedded transform blocks, if the coefficients are near the threshold, they will be shifted toward two ends so that the embedded watermark is not noticeable but more robust.
With the integration of the above three state-of-art techniques, the resulting watermarking system has excellent performance. Simulation results confirm that the proposed system is extremely robust against cropping, JPEG, JPEG2000, and SPIHT compression. |
| 參考文獻 |
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