Effects Of Personal Factors And Presence Probability On Threat Detection Performance In X-Ray

The importance of security screening has increased dramatically in recent years.As seen with the September11th attacks，all aspects of airport security screening areof major concern because it affects the safety of the airline industry. However, the jobof security screeners is a highly demanding task; a screener has to decide within fewseconds only whether the bag is ok or not ok based on the high bag complexity.Based on visual cognition processes and cognitive task analysis, we identifydifferent abilities on detection performance. In a first step, the influence of ability ondetection performance was investigated under different levels of time stress. Inaddition, time stress, the effect of X-Ray image complexity, threat items and genderon detection performance was analyzed, and the relationship between abilities andperformance under different levels of time stress and X-Ray image complexity wasconstructed. Further, likelihood that the miss error, false alarm and detectionperformance of a screener will be changed varies with target prevalence, thefrequency with which targets are presented across trials, we carried on this study. Inthis paper, we present a method to measure screener detection performance based onsignal detection theory.The results indicate the influence of abilities on X-Ray detetion performance.Image analysis and object recognition have a significant effect on visual searchperformance. main effect of time stress, X-Ray image complexity and threat items ondetection performance. The relationship between abilities and performance underdifferent levels of time stress and X-Ray image complexity are different. Time stress,X-Ray image complexity and threat items reveal the significant influence ondetection performance. In addition, miss error rates and detection performance arehigher at low target prevalence (20%) than at high prevalence, the result is inversewith false alarm, which demonstrate that miss error was caused by a criterion shiftrather than a change of sensitivity.