POINT TRACKING AND IMAGE RECTIFICATION IN VIDEO ACTIVITIES
André Heck · 2005
Video analysis means that you capture a video clip with a web cam or digital camera, collect data of a moving object by clicking with the mouse in video frames, and finally analyse the recorded motion data. Two problems experienced in practice are that manual data collection can be too time-consuming and that perspective distortion can interfere with useful video analysis. In this paper we present how the computer learning environment Coach deals with both issues. Examples illustrate that point tracking in video clips and perspective correction of images of planes broaden the scope of video and image measurement in practical work of students. POINT TRACKING In [1] we presented learning materials for students in upper pre-university education to act like human movement scientists inside and outside the classroom. They record video clips of their own ways of walking with a web cam, collect high-quality, realtime data from these short movies, and use the computer learning environment Coach to analyse the collected data. We try to make their science learning resemble science practice, in which investigations can often be characterised as being challenging,