A Watermark System for MPEG Video Encoder

Introduction

• Digital watermark falls into two parts:

– Visible watermark.

– Invisible watermark.

• The watermark algorithms use different methods for embedding:

– Communication theory.

– Compare values of relative position in different embedded location.

– Probability model.

Feature

• Spatial and transform domain embedding algorithm.

• Spread spectrum and encryption techniques.

• Joint data compression and watermark system.

• Blind extracted watermark.

Experiment Results

Robustness:

Transform domain embedding:

Robustness against MPEG-2 Compression:

Made by 蔡連宗