Immediate Presence of Handwritten Annotation on Moving Picture in Real-Time Collaborative System

Collaborative annotation system allows a remote user to add handwritten annotation directly on local user’s view. However, previous systems cannot present handwritten annotation in real-time until all annotations have been drawn. This paper proposes a technique for collaborative annotation system that enables the immediate presence of handwritten annotation on moving picture during collaboration. This technique extracts coordinates data from handwritten annotation and reorganizes theses data in the order of strokes. Then it transmits these data to local user side in sequence. The local side receives the annotation data and presents the world-stabilized handwritten annotation in the environment. Two major optimizations are carried out in this study. One is the handwritten annotations can accurately and immediately be presented on the local side. The other is the data usage in collaboration is reduced. This research facilitates the communication between geographically dispersed users to achieve efficient collaboration. The proposed system can be applied in various fields.