Information presentation system, area extraction device, and program

Abstract

To eliminate interference between a projection image and a board writing item, and make the board writing item more readily visible.SOLUTION: An information presentation system 1 presents a projection image, which is formed with emitted light of an electronic educational material image e, to a blackboard 6, extracts an area of a board writing item w as a board writing area from shot video C containing the projection image and the board writing item w written on the blackboard 6, and intercepts part of the emitted light of the electronic educational material image e associated with board writing coordinates information R'(x, y). The information presentation system 1 includes a projector 3 that projects the emitted light of the electronic educational material image e on the blackboard 6, a light interception device 4 that intercepts part of the emitted light of the electronic educational material image e on the basis of the board writing coordinates information R'(x, y), a camera 5 that images the shot video C containing the projection image and board writing item w, and an area extraction device 2 that extracts the projection image c, which is video of an area of a projection image, from the shot video C, compares the projection image c with the electronic educational material image e so as to extract an area having a difference as a board writing area R', and outputs the board writing coordinates information R'(x, y) to the light interception device 4.SELECTED DRAWING: Figure 1

Images