Visual Field Projection and Region of Interest Analysis

Abstract

The visual field determines what someone can see. When a person is confronted by a target scene, visual field projection allows to characterize the center of attention by localizing a region of interest. Region-of-interest analysis for various persons throughout time helps to understand the visual behavior of the person observed. It also improves the understanding of the target scene and permits its reorganization when necessary. In this chapter, we will determine the characteristics to estimate the visual field of a person from a video flow. This estimation is first performed when the subject observes a frontal position. When the eyes are visible at a given time in the video flow, the fixation point is corrected by calculating the eye movements with regard to the point of reference. The visual field is then adapted to head orientation via the values of the three degrees of freedom, as calculated previously. When the subject's attention is caught by the target scene, the visual field (or perception volume) related to the subject is projected to that scene.