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Factors Influencing Searching and Comparing Grey Objects on a PC Screen

XU Yi-fei,ZhANG Kan(Institute of Psychology,Chinese Academy of Sciences,Beijing 100101,China)  
The effect of size and number of pictures displayed on searching and comparing grey objects on a PC screen was studied.Non-medical experiment tasks were designed to simulate medical image diagnosis process for non-medical background subjects.The results indicate: The number of pictures and their size on each screen should be traded off according to the nature of task-for comparing task,larger size pictures with enough sharpness and precision;for search task,more pictures with enough resolution.
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