| 摘要 |
X-direction double integrator 3 integrates twice an acceleration that is detected by x-direction acceleration sensor 1 , estimating a traveled distance in an x direction. Y-direction double integrator 4 integrates twice an acceleration that is detected by y-direction acceleration sensor 2 , estimating a traveled distance in a y direction. Detection boundary storage unit 5 stores a monitoring area. Detection boundary comparator 6 determines whether the projector device is positioned outside of the monitoring area or not based on the traveled distance in the x direction which is estimated by x-direction double integrator 3 , the traveled distance in the y direction which is estimated by y-direction double integrator 4 , and the monitoring area stored in detection boundary storage unit 5.
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