A Study Of Targets Independence And Modeling Of Multiple-target Random Visual Search

Visual search is always an important research field in human factors and ergonomics which has a range practical application in industrial inspection, medical and military fields. In recent years, the focus of research shifted from single target visual search to the multiple-target visual search study.This study is mainly to explore the multiple-target model of visual search. First of all, various existing models of visual search were studies extensively. Secondly, through the design of related software, visual search experiments were carried out simulating the real search situation. Finally, experimental results obtained and revised model was given under experiment results. In the experiment search scenarios, first a triple-target visual search experiment was carried out to modify the model; In order to verify the accuracy and applicability of the model, a four-target visual search experiment and a triple-target experiment with different target conspicuity were performed. The last two experiments verified the accuracy and applicability of the revised model which was came from the first experiment.In this study, the concepts of effective visual search field and target independence are raised. This study suggests that the remarkable difference between single-target visual search with multiple one is that the effective visual search field is actually changing though the search field remains the same. The search time of former target will affect the later one, so the search time of each target is not independent. This study proposes a modified visual search model and two new concepts which would be helpful in further explosion of related theory and also the practical application.