可穿戴控制器在2D和3D情境下指向與手勢任務之績效評估

Performance evaluation of wearable controller for pointing and gesture task in 2D and 3D situation

張家豪(Jia-Hao Jhang)

指導教授 ： 呂志維

中原大學/電機資訊學院/工業與系統工程研究所/碩士(2017年)

https://doi.org/10.6840/cycu201700570

摘要

體感控制技術、指向操作於汽車製造業中的虛擬裝配、生活中發展應用，並以顯示 器螢幕或虛擬實境設備搭配使用。現今體感控制器大多是以鏡頭感測、手持控制等方法 作為輸入，近年來發展出以穿戴方式偵測人體肌電訊號，藉此判斷人體手勢進行操作， 而穿戴式智慧臂環正是少數以體感結合人體肌電之輸入裝置，裝置應用更包含了介面游 標控制(點擊、拖曳)，但運用穿戴式的指向方式，適用性不明確且有待評估。
本研究共18位受測者操作MYO智慧臂環與空中滑鼠，操作介面運用投影機投影，並使用二種任務難度(簡易、中等)、上肢操作姿勢(肩膀、手肘)為基準進行指向、手勢任務，並將手勢動作時間分離，藉由得出之移動時間、目標區再進入次數、輸出量、手臂移動範圍、主觀評量問卷等資料來進行後續分析，藉此判斷各式控制器在不同情形下指向、手勢操作之優缺點並給予相關建議。
根據研究結果顯示，穿戴式控制器(1)在二維與三維的操作中，以手肘為中心的姿勢操作績效與舒適度較佳、(2)在二維操作中，困難任務錯誤率較高；三維操作中，難度並不會使錯誤率有所差異，表明簡單的手勢設定有助於使用者操作、(3)以手肘在二維操作的上下半部移動的手臂移動範圍較小，三維操作則是在左右半部移動手臂移動範圍較小、(4)三維手勢操作績效優於空中滑鼠按鈕操作，本研究結果建議穿戴式控制器能在改變姿勢、九軸感測器技術加強、額外穿戴裝置輔助，將對穿戴式肌電臂環手勢、指向績效有所幫助，提供設計與使用者作為參考。

關鍵字

費茲定律 ； 穿戴式裝置 ； 手勢 ； 空中指向 ； 手臂移動範圍

並列摘要

The motion-control technology and directional operation have been applied in daily life and also in the virtual assembly in the automotive industry, and practically used in combination with monitor screen or virtual reality equipment. Currently, the motion-controllers mostly use lens sensing and handheld controlling devices for inputs. In recent years, wearable devices have been developed to detect human EMG signals, helping human body gestures to be determined for operation. MYO armbands are one of the few wearable devices that not only combine motion-control technology and human EMG signals, but also include an interface for cursor controlling (click, drag) in the input device. Nevertheless, the directional approaches and the applicability of such kind of wearable devices are still unclear and need to be further evaluated.
In this study, a total of 18 subjects were assigned to operate with MYO armband and air mouse. The operation interface was projected through a projector. Two difficulty task levels (simple, medium) and upper limb operation gestures (shoulder, elbow) were applied as the basis to conduct directional and gesture tasks, and the gesture movements were separated by time. The resulting data of movement time, target re-entry, throughput, arm movement range, and the subjective assessment questionnaire were all used to perform the follow-up analysis. The analysis results were used to determine the advantages and disadvantages of the directional and gesture operation of the various controllers in different circumstances, and relevant recommendations were also provided.
Based on the research results, the wearable controllers have shown that: 1) The gestures with the elbow as the center have better operation performance and comfort in the two-dimensional and three-dimensional operation; 2) In the two-dimensional operation, the difficulty tasks have higher error rates; in the three-dimensional operation, the difficulty levels have no influence on the error rate, indicating that a simple gesture setting can help users to operate; 3) The arm movement range with the elbow as the center is smaller in the upper and lower directions in the two-dimensional operation, while it is smaller in the right and left directions in the three-dimensional operation; 4) The three-dimensional gestures have better operation performance than the air mouse operation. This study suggests that if the wearable controllers can change the gestures, improve the nine-axis IMU technology, and use additional wearable devices for assistance, it would help greatly for the gesture and directional performance of wearable EMG armbands, which could be provided as a reference for both designers and users.

並列關鍵字

fitts’s law ； wearable device ； gesture ； air pointing ； arm movement range

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