A 2-WAY DUAL-VIEW TELETEACHING SYSTEM CONVEYING GESTURES AND CHALKBOARD CONTENTS

In current teleteaching systems, video conferencing systems have been used to transmit a motion video from a teacher's site. A video that ca ptures a teacher or his or her chalkboard is transmitted to a remote s ite through a communication channel. Since the resolution of the video is not very high, a camera captures either a teacher or a chalkboard, but not both at the same time. Thus, remote students have difficulty in obtaining realistic sensation. Another approach to realizing telete aching is to use a computer-based desktop conferencing system that sup ports a motion video and a computer-based shared chalkboard. In this a pproach, a teacher has to use a mouse or a handwriting tablet for inpu t, and therefore cannot use a real chalkboard. Moreover, the teacher c annot use gestures to remote students. This paper presents a multimedi a teleteaching system that integrates an electronic whiteboard with a multimedia desktop conferencing system for providing realistic sensati on to remote students. The system provides two-way communication of a video and a computerized chalkboard. A teacher uses an electronic whit eboard as a real whiteboard using direct manipulation, and transmits h is or her gestures to remote students by using video communication. Th e system provides dual views; one view is for teacher's gestures and t he other is for chalkboard contents. By providing the dual views, the system can transmit teacher's gestures all the time. Since chalkboard contents are processed and displayed as computer data, students can se e them clearly. With the computerized chalkboard, a teacher or a stude nt can zoom contents, input data written on a paper using a scanner, o r add annotation.