Digital watermarking for compressed videos

• Main Author: Sugiri Pranata.
• Other Authors: Chua, Hock Chuan
• Format: Theses and Dissertations
• Published: 2008
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems
• Online Access: http://hdl.handle.net/10356/3296
• Institution: 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.