View Selection of Safety Managers Affects Their Ability to Evaluate Safety Level of Workers

Evaluating the safety level of work behaviors is an important means of safety management through safety managers’ manual visual or video surveillance. This paper aims to grasp the view selection rules of safety managers in correctly observing and analyzing work behavior, which are conducive to safety behavior assessment. Firstly, based on a similarity simulation experiment, the work process of the operators was simulated, and the process was simultaneously monitored from multiple views to obtain surveillance videos. Then, safety managers with different experience levels watched the videos and answered the questionnaire in a questionnaire survey experiment. The authors found the following: (1) Prior experience does not affect the view selection during the observation stage, but it does affect the view selection during the analysis stage. Experienced safety managers perform better in view selection when dealing with complex tasks. (2) The work postures have a significant effect on the view type and their combination order. (3) The view selection of experienced safety managers in the behavior observation and analysis stages is non-constant except for sitting posture operations, while the view selection of amateur managers is always constant. (4) Sitting posture work takes the front view as the main view and the left–right–upper views as auxiliary views; standing posture uses the left and right views as the main views and the front–back–upper views as auxiliary views; and mixed posture takes the left and right views as the main views and the upper–front–back views as auxiliary views. These view selection rules can achieve the highest evaluation performance. These findings can help train or select high-quality safety managers and provide a scientific basis for arranging views during video surveillance.