Portable vision-based response analyzer with sheet bending recognition

Device-free response analyzer system, which employs fiducial marker sheets and its recognition technologies, has been proposed to reduce the management tasks of student devices such as clickers and smartphones. Conventional device-free response analyzer systems utilize a PC and cameras to realize the recognition of the fiducial markers. However, the installation of the PC and cameras requires additional burdens for teachers. We have implemented the function of device-free response analyzer on a tablet OS. Thanks to the portability of the tablets, the teachers can easily conduct the response analyzer lecture. We have also implemented a sheet bending recognition, which enhances the modality of the marker-based response analyzer, to our system.