Abstract: Measurement of the convergence angle of a viewer's eye can be useful in evaluating his perception of depth while watching, for example, HDTV or 3D stereoscopic pictures. First, the target was moved away from the subject to determine convergence characteristics in a natural scene. The convergence angle changed as the target moved and the distance calculated using the intersection of the sight lines of both eyes also corresponded well to the actual position of the target. Secondly polarized binocular stereoscopic pictures were used. The Parallax of the CG pattern changed at 5-second intervals toward the foreground or background in steps, from 0 to one of three parallax amplitudes. As a result, the convergence distribution widened as the parallax increased. This spread was large when the target was presented in the foreground. Next, a program prepared stereoscopically was presented in 3D with parallax and in 2D without parallax. The results indicated that the convergence varied even when viewed 2D and that the convergence distribution was larger in 3D than in 2D. As for the possible cause of this change with 2D picture, the influence of the feeling of depth produced by the 2D picture should be considered.!
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