视频公开课中投影屏幕信息的拍摄与处理

Recording and Processing of the Projected-information in Open Video Course

投影屏幕信息是视频公开课中不可缺少的教学信息。纵观已上线的视频公开课，发现大部分课程中投影屏幕信息的呈现方式为图片插入，这种方法存在漏失教师肢体语言及视觉注意引导信息的缺陷。采用直接拍摄法能很好地解决这一缺陷，但在拍摄时也会遇到诸多问题。在视频公开课拍摄前、拍摄中以及拍摄后采取一系列的措施和优化，可较好地解决这些问题，以传递真实完整的课堂信息。

Projected-information on screen plays an indispensable role in open video courses. The present online open video courses show the information mostly by image insertion， which has no signs of the teacher’s body language and visual guiding attention. Direct videography solves these defects but encounters other troubles. Taking a series of measures and optimizations before， during， and after recording can resolve these problems for clear projected-information on screen to transmit the real full class.