| Summary: | 碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 100 === For automatic recording of the traditional lecture with a wide blackboard by using a Pan-Tilt-Zoom (PTZ) camera, a system, called ACRS (After Class Reviewing System), was proposed. To students reviewing the lecture the handwritten data is more important than video of the lecturer. The handwritten data and the lecturer were considered together to record a lecture most suitable for student review. ACRS is consists to two phases: the wide-angle phase and zoom-in phase. In the wide-angle phase, the temporal differencing method was used to detect lecturer. The lecturer detection of zoom-in phase is detected by Sobel edge detection and optimal thresholding method with iteration. We improved the GMM to construct the background model for handwritten data detection. After the construction, we used the background model to detect handwritten data by background subtraction method. The camera is controlled through the two pre-defined parameters, the results of lecturer detection and handwritten data detection. In the experimental study, the video recorded by ACRS was compared with that recorded manually by a cameraman. About 83% of the video time was close to the video recorded manually and suitable for review by students.
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