Effectiveness of Throughput for Evaluating Usability in Pointing Task by Eye-gaze Input System
Effectiveness of Throughput for Evaluating Usability in Pointing Task by Eye-gaze Input System
复制标题
通过眼注视输入系统评估指向任务可用性的吞吐量有效性
DOI：
10.11443/jphf.25.1_21
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
土井俊央，村田厚生
中科院分区：
文献类型：
--
作者：
Jing;Q.;Sasa;K.;Chen;C.;Zhang;X.;and Yin;Y.;土井俊央，村田厚生
本研究的目的是验证ISO9241-411规定的指向设备性能指标吞吐量作为眼注视输入系统中指向任务的可用性指标的有效性。本研究探讨了吞吐量与主观评定分数之间的关系。本实验中的指向任务是移动光标并点击实验屏幕上的预定目标。目标形状、目标大小、运动距离和目标呈现方向被设置为受试者内实验变量。测量了指针指向时间、光标坐标和指针指向任务的主观难易度，并计算了有效难度指数和吞吐量。难度的有效指标是衡量ISO9241-411规定的任务所要求的精度。结果表明，利用二维有效靶宽计算的吞吐量与主观评分具有较高的相关性。为了进一步增强相关性，根据有效目标距离与目标形状长宽比的关系，改进了有效目标距离的计算公式。利用改进的有效目标距离获得的吞吐量增强了相关性。
The aim of this study was to verify the effectiveness of throughput, which is a performance index for pointing devices specified by ISO9241-411, as a usability index of pointing tasks in eye-gaze input systems. This study investigated the correlation between throughput and the subjective rating score. The pointing task in this experiment is moving a cursor and clicking a predetermined target on an experimental screen. The target shape, the target size, the movement distance, and the direction of the target presentation were set as within-subject experimental variables. The pointing time, the coordinate of the cursor, and the subjective rating on ease of the pointing task were measured, and the effective index of difficulty and the throughput were calculated. The effective index of difficulty is the measure of precision required in a task specified by ISO9241-411. As a result, the throughput calculated using the two-dimensional effective target width showed high correlation with the subjective rating score. To further enhance the correlation, the formula to calculate the effective target distance was improved based on its relationship with the aspect ratio of the target shape. The throughput obtained using the improved effective target distance enhanced the correlation.