Group Aggregation Function of Interactive Class System

Abstract

Interactive class system is an inexpensive and simple system consisting of PC, Web cameras and color cards. In the class, there are cases where groups are formed and discussions and activities are carried out, but using the previous system, the status of each group was not known because all the number of color cards were recognized at once by the system. Using this study, we were able to ask numbers of color cards for each group. We developed two kinds of methods which can specify ranges by rectangles or straight lines. As a result of the questionnaire, it was found that two types of group aggregators are useful.