Factors affecting human gaze behavior: an analysis with complex natural scenes with superimposed object images M Suzuki1, Y Yamane1, J Ito2, M Mukai1, S Strokov3, I Fujita1, P E Maldonado4, S Gruen2, H Tamura1 |
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1Graduate School of Frontier Biosciences, Osaka University, Japan |
| Humans perform frequent saccadic eye movements to collect visual information from the environment. To study human gaze behavior, we used natural scene images in with multiple visual objects were embedded. In order to quantify the conspicuousness of the objects, we defined a contrast index (CI) as the mean difference of RGB values of the object image and of the patch of background occluded by it. A low CI value leads to the visual impression of the object merging into the background, since typically also the surrounding of the patch is similar to the occluded patch (i.e., the structure of natural scenes is locally correlated). By manipulating the position and size of the object we controlled the conspicuousness of the objects and investigated the factors affecting the eye movements of human subjects freely viewing the composed images. As expected, high CI values led to a larger number of fixations on the objects as compared to objects of low CIs. However, also other factors influenced the gaze behaviors: a) objects near the center of the images were more often fixated than those in the periphery, and b) human faces attracted gaze more often than other objects. |
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