PROBLEM TO BE SOLVED: To promptly and highly accurately detect that a human body on a bed starts a bed-leaving movement.SOLUTION: This bed-leaving prediction apparatus includes a transmitter 2 for transmitting an ultrasonic signal to a management area 8, a receiver 3 for receiving the ultrasonic signal reflected in the management area 8, a position computing means 4 computing three-dimensional positions of the head parts of patients on beds or of objects other than those based on the reflected wave data acquired by the receiver 3 and classifying the three-dimensional positions into a group of a plurality of the head parts of the human bodies and a group of the other objects, a determination means 5 detecting a temporal change from the recumbent position of the patients three-dimensional position based on the computing result of the position computing means 4 and determining whether or not the patient 10 on the bed starts the bed-leaving movement based on the detection result, and a notification means 6 issuing a notification signal when detecting the start of the bed-leaving movement of the patient 10 by the determination means 5. The determination means 5 includes a deletion means 21 deleting a group of head parts whose movements are untraceable for a predetermined time or more, from a subsequent processing.COPYRIGHT: (C)2010,JPO&INPIT【課題】ベッド上の人体の離床動作の開始を早期且つ精度良く検出する。【解決手段】管理エリア8に超音波信号を送信する送波器2と、管理エリア8内で反射した超音波信号を受信する受波器3と、受波器3で取得される反射波データからベッド上の患者の頭部またはそれ以外の物体の三次元位置を演算して、三次元位置を複数の人体の頭部のグループ又は他の物体のグループに分類する位置演算手段4と、位置演算手段4の演算結果から患者の三次元位置の横臥位置からの時間的な変化を検知し、検知結果に基づいてベッド上の患者10が離床動作を開始したか否かを判定する判定手段5と、判定手段5によって患者10の離床動作の開始が検知された場合に報知信号を発する報知手段6とを備える。判定手段5は、所定時間以上、移動の追跡ができない頭部のグループを以後の処理から外す抹消手段21を備えている【選択図】図1
