Coaster: Variable Play-back of Video Using Direct and Continuous Manipulation of Video Space

摘要

Environments for scripting and distributing structured video such as MPEG-4 have being gradually developed in recent years. Still there is not much advancement in the technology for making interactions with video using full advantages of their scripted structures. This paper proposes 'Coaster' (COntinuous Access by Spatio-Temporal slidER) as a new video interface for direct manipulation of the video that is structured with spatio-temporal information. The interface is implemented with a polygonal line shaped slider that represents temporal changes of the video and approximations of objects' trail in the video. The polygonal line slider is placed on a monitor and performs as an anchor that assists user's interaction with the spatio- temporal information. Coaster can flexibly map spatial and temporal information on the 2D display without loosing temporal continuity of the video. For example, by placing the polygonal line according to the object's motion, an intuitive variable play-back of the video as if the user is grabbing and moving the object can be achieved. In this paper, we will mention Coaster that continuously follows the user's input and also the continuous play-back of audio information. Further, we will show the effectiveness of the proposed method by showing various applications for video handling.