Study on Production of Video Images by Computer Controlled Camera Operation and Switching of Plural Camera Images

随着网络技术的发展，高速数字数据传输成为可能，远程学习系统应运而生。在这个项目中，我们提出了一种使用计算机控制的摄像机操作和多个摄像机图像的切换来产生生动的远程学习视频图像的方法。(1)基于时空互信息分布的场景拍摄我们基于信息论在给定视频图像的像素上定义时空互信息，可以理解为人类感兴趣点的理论估计。利用时空互信息的分布，提出了一种计算机控制摄像机操作和多摄像机图像切换的算法，通过实时图像处理，获得生动的远程教学视频图像。(2)基于情境理解和视频图像评价的场景拍摄。拍摄摄像机系统根据教师在黑板前的头部和手部的动作以及黑板上的文字来估计教师的动作。每个摄像机根据教师的动作选择一个拍摄区域，然后计算机控制的切换系统通过对每个图像的评估，在众多图像中选择最佳图像。

High-speed digital data transmission becomes possible accompanied with the development of network techniques, and distant learning systems are developed. In this project, we propose a method of producing vivid video images of the distance learning using a computer controlled camera operation and switching of plural camera images.(1) Shooting the scene based on distribution of spatiotemporal mutual informationWe define spatiotemporal mutual information on the pixels of a given video image on the basis of information theory, which can be interpreted as the theoretical estimation of interested spots for human being. Using the distribution of the spatiotemporal mutual information, we propose an algorithm of computer controlled camera operation and switching of plural camera images to take vivid video images of distance learning with real time image processing.(2) Shooting the scene based on situation understanding and evaluation of video imagesA shooting camera system estimates actions of a teacher in front of the blackboard considering the movement of the head and the hands and written characters on a blackboard. Each camera chooses a shooting area based on the actions of the teacher, then computer controlled switching system selects the best image among plural imagss by evaluation each image.