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This article discusses how to recognize situations in which assembly work assigned in a class for a course in practical training is performed by each of the current participants with high activity and concentration based on video images of a class for preparation of video teaching materials to enhance the motivation of future course participants. In the discussion, observable features to be used as the visual clues for evaluating activity and concentration of the work by each participant in each scene of the video are proposed together with image processing for obtaining those features from the video images. Experimental results for videos of assembly work with different degrees of activity and concentration are also presented.

Video-Based Performance Recognition of Assembly Work in a Practical Training Class for Teaching Material Preparation