Digital watermarking for compressed videos

• المؤلف الرئيسي: Sugiri Pranata.
• مؤلفون آخرون: Chua, Hock Chuan
• التنسيق: Theses and Dissertations
• منشور في: 2008
• الموضوعات: DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems
• الوصول للمادة أونلاين: http://hdl.handle.net/10356/3296
• المؤسسة: Nanyang Technological University

In this thesis, a fast and real-time watermarking system for MPEG videos in the quantized DCT (QDCT) domain based on spread spectrum technique is designed and developed to alleviate several drawbacks suffered by other watermarking systems. A compressed-domain edge detection mechanism is incorporated to minimize the perceptual distortion of the watermarked videos. Two watermark embedding approaches, namely additive and multiplicative embedding, are investigated. While there is always a trade-off between retrieval reliability and invisibility in watermarking, our proposed system is able to achieve high watermark robustness and acceptable video fidelity.