携帯電話の格納場所連続監視手法: 歩行時および格納動作時判定処理の文脈的併用

摘要

A mobile phone is getting ready for sensors and aware of various contexts about a user and the terminal itself. The contextual information is utilized to provide an appropriate information/service to a user. In this paper, we propose a placement recognition of a mobile phone terminal on the pedestrian's body. The uniqueness of the proposed method is that it supports recognition not only during walking but also at the time of storing by taking into account the carrying context of a terminal. The proposed method supports recognition not only during walking but also at the time of storing by taking into account the carrying context of a terminal. The experimental results under strict conditions (Leave-One-Subject-Out Cross-Validation) showed that the accuracy for the recognition while walking and that of storing gesture recognition were 75.7％ and 68.5％, respectively. We also report a feasibility study under realistic conditions.%近年報告されている携帯電話の格納場所認識手法の多くは歩行動作に着目するものであり，判定可能な状況が限定的である.本研究では歩行動作および携帯電話の移動時の動作に着目した判定手法を動的に切り替えることによって，この欠点を解消した.これらは交差検定の結果，歩行時判定は75.7％,格納時判定は68.5％の精度を示した.また，手法の動的切り替えは，実環境での歩行実験を行いその頑健性と正確性を確認できた.よって提案手法は格納場所情報を連続的に提供することにより，センサコンテキストに応じた適切な処理の切り替えを行うモバイルセンシングの実現を支援するものとなった.