Abstract
Abstract. Some diseases, for instance, a glaucoma, cause visual field defects. For the timely diagnostics of such defects, various methods are used. One of the state-of-the-art diagnostic methods is automated static perimetry. The method of static perimetry consists in the light sensitivity determination in different parts of the visual field using stationary objects of variable luminosity. When scanning the visual field in this way, an important factor is the control of gaze fixation at the fixation point. The greatest accuracy in determining the gaze fixation position is achieved by the method of the pupil visual tracking using a video camera.In this paper, four groups of visual tracking algorithms are considered: segmentation-based methods, correlation methods, methods based on optical flow and on weighted average. An experimental comparison of these methods was carried out using the base of video recordings obtained in the automatic static perimetry apparatus. On these videos the ground truth tracks of pupil were marked. The comparison was conducted according to two criteria: center location error and tracking length. It is shown that only the weighted average method has an acceptable tracking length.
Highlights
One of the state-of-the-art methods of medical examination of visual fields is automated static perimetry (Delgado et al, 2002)
It is possible to control the gaze fixation through video recording of the eye using a video camera installed inside the automatic static perimetry apparatus
The typical images of human eye filmed by used automated static perimetry apparatus are shown on Figure 1
Summary
One of the state-of-the-art methods of medical examination of visual fields is automated static perimetry (Delgado et al, 2002). The essence of this examination is that the patient is presented with luminous point stimuli in different zones of the visual field. In order to know which position of the visual field the stimulus locates, it is necessary to have information about the gaze direction and to establish the fact of its fixation at the fixation point. It is possible to control the gaze fixation through video recording of the eye using a video camera installed inside the automatic static perimetry apparatus. The typical images of human eye filmed by used automated static perimetry apparatus are shown on Figure 1
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