客製化腦性麻痺使用者鍵盤輔具之研究

On Customizing a Prosthetic Keyboard for a Cerebral Palsy User

朱峰頡(Feng-Chieh Chu)

指導教授 ： 石勝文

國立暨南國際大學/科技學院/資訊工程學系/碩士(2011年)

https://doi.org/10.6837/NCNU.2011.00134

摘要

本論文將提出一個按鍵操作精確度評估系統來評估腦性麻痺患者在不同位置敲擊按鍵時的誤差量，這個隨位置而變化的誤差量將可用於設計適用於不同腦性麻痺患者的鍵盤配置。誤差量小表示受測者的運動操控能力較佳，在同一空間中可以擺放的按鍵數可以增多，以提昇輸入效率。反之，按鍵數就必須縮減，以便加大按鍵間距，避免誤按。利用這個評估系統的誤差量測結果，我們發展了一個基於貪進法 (Greedy Method) 的按鍵配置法。這個演算法會自動計算可以配置的按鍵總數，並且可以根據受測需求，輸入預設的按鍵間距。在按鍵配置的計算中也會隨按鍵擺放位置的操控誤差值，自動調整其間距。實驗數據顯示得到的結果跟我們所想得到的理想值十分接近。利用按鍵配置的演算法所定出的鍵盤可以搭配國立暨南國際大學資工系黃展浩碩士論文中所發展的鍵盤輔具輸入設計演算法，依各字符使用頻率，設計有效率的輸入法，完成一套具有完整功能的腦麻患者電腦鍵盤輔具。

關鍵字

腦性麻痺 ； 鍵盤輔具 ； 按鍵配置 ； 按鍵輸入效率 ； 貪進法

並列摘要

In this thesis, a button-operation motor-skill assessment (BOMSA) system is proposed to estimate the position-dependent displacement error of a person with cerebral palsy when he/she is operating a button array. This position-dependent displacement error map can be used to design a tailor-made prosthetic keyboard for a person with cerebral palsy. A small displacement error indicates that the subject has a better motor-skill for operating a button array and, hence, the density of buttons can be increased to improve his/her input efficiency. Conversely, a large displacement error indicates that a low density button array is useful to reduce the miss-press rate. Based on the displacement error map obtained by using the BOMSA system, we have also developed a greedy method for designing the keyboard layout. The proposed method takes a default button spacing parameter and automatically determines the maximum number of buttons that can be placed in a specified region. The button spacing is determined according to the displacement error and, thus, it is space variant. Experiment results show that the design outcome is very close to the expected ideal one. With the designed keyboard layout, one can apply the input method design algorithm proposed by Huang in 2011 to develop an efficient prosthetic keyboard for a person with cerebral palsy according to the usage frequency of each character.

並列關鍵字

cerebral palsy ； prosthetic keyboard ； keyboard layout design ； key input efficiency ； greedy method

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