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Determination of the Visual Field of Persons in a Scene

The determination of the visual field for several persons in a scene is an important problem with many applications in human behavior understanding for security and customized marketing. One such application, addressed in this paper, is to catch the visual field of persons in a scene. We obtained the head pose in the image sequence manually in order to determine exactly the visual field of persons in the monitored scene. We use knowledge about the human vision, trigonometrical relations to calculate the length and the height of the visual field and quaternion approach for doing several changes of reference marks. We demonstrate this technique using a data set of videos taken by surveillance cameras on shops.