数字信息屏显时间对人机监视工效的影响

目的 研究数字显示时间对人机监视工效的影响，为进行信息监视与操作的人机功能分配提供依据。方法 用摄像头模拟机器监视，设计图像识别算法，对所显示的数字进行识别；而被试者对计算机屏幕上显示的数字进行识别；对人和机器均记录其判断的正确率。结果 被试者在1500ms时对数字信息判断的正确率有一个阶跃性变化。若屏显时间处于1500ms以下并依次减小，被试者判断的正确率也随之减小并可能减至0。在1500ms以上的各个屏显时间，被试者对所示数字信息判断的正确率接近于100％，当屏显时间为5000ms时则正确率均值为97．67％。在屏显时间范围内，机器判断的正确率变化很小。结论 数字显示时间不同，对操作者判断的正确率有很大影响，而对机器判断影响不大。

Effects of Digital Information Display Time on Human and Machines Monitoring Performance

Objective: To provide an index for function allocation of information monitoring between human and machine by studying the effect of digital information display time on human or machine monitoring performance. Method: Two computers were used. One computer, ten numbers with two decided digits were displayed randomly for three times. The display time varied from 200 ms to 5000 ms with different intervals. The other's monitor was simulated by a camera recorder and image identifying arithmetics was designed. Subjects watched the CRT and press the computer keys related with the figure on the CRT. In every experiment, the correct rate of human press or machine identification was recorded. Result: The subjects' correct rate varied sharply when display time was 1500 ms. When display time was shorter then 1500 ms, subjects' correct rate decreased accordingly and may approach 0. From 1500 ms to 4500 ms, the subjects' correct rate was close to 100.0%. But when the display time was 5000 ms, the subjects' correct rate decreased slightly to 97.67%. From 50 ms to 5000 ms, the machine's correct rate varied little at different display times. Conclusion: The digital display time has very great effect on human monitoring performance. But it has little effect on machine performance.