![]() This principle enables the intermediate viewpoint between the two viewpoints to be continuously interpolated and enables smooth viewpoint switching in the motion parallax even with a small number of projectors. In this system, the person perceives that the object is at the position of depth S due to the motion parallax.įig. 3, in which the luminance of Object 1 gradually decreases as the viewpoint moves from Viewpoint 1 to Viewpoint 2 and the luminance of Object 2 gradually increases. For example, let us assume a system such as that shown in Fig. Utilizing this phenomenon makes it possible to present depth using motion parallax and binocular disparity. In this section, we describe the optical linear blending technology and the spatially imaged iris plane screen.Ĭhanging the luminance ratio of two overlapped objects separated by a fusion limit enables the position of an object perceived by a person to change smoothly between the two objects ( Fig. Glassless 3D display screen adapted for viewpoint movement In this article, we propose an improved multi-viewpoint glassless 3D display system that overcomes previous display and viewing area problems by using a special optical screen called a spatially imaged iris plane screen developed in collaboration with Tohoku University. (a) Conventional super multi-view 3D screen (b) our target. In our earlier implementation, we found that it was difficult to increase the display area and widen the viewing area as a result of the optical configuration of the lens system.įig. This is a glassless 3D screen system enabling smooth movement of viewpoints using very few projectors. NTT Service Evolution Laboratories has been working to address these needs by focusing on optical linear blending technology that smoothly blends the luminance ratio of multiple images as the viewpoint moves ( Fig. These include creating many multi-view video sources, preparing the large number of projectors, and synchronizing the video sources. However, in systems like this using many projectors, several things are necessary in order to switch viewpoints smoothly. This system can project images of people with high presence as if they were actually in that location. proposed the use of this method to achieve a natural 3D vision system including motion parallax in a 135-degree viewing range by arranging 216 projectors at 0.625-degree intervals. Natural 3D vision can be achieved with this method with only a slight decrease in resolution. One method, for example, involves projecting images from multiple directions onto a special screen having a narrow diffusion angle to create a multi-view image ( Fig. Third, the dependence of the magnitude of the immediate correction effect on distance was abolished when the target was only transiently visible.A number of methods have been proposed for glassless three-dimensional (3D) displays that include motion parallax. Second, the immediate correction effect was larger in the light than in the dark. As predicted, the immediate correction varied as a function of target distance. We compared orientation errors for targets placed at varying distances when the room was lit, dark, and when the targets were flashing in the dark. ![]() Participants were instructed to orient their heads and bodies to face the target objects, and we recorded positional information via a motion-tracking system. We presented participants with illuminated target objects while they wore horizontally shifting prism glasses. Our hypothesis would also predict two other patterns of behaviour: the immediate correction effect should reduce with the distance of the target (motion parallax reduces with distance), and the immediate correction effect should be reduced if the target is only transiently visible (removal of motion signal). Accordingly, the light/dark effect would result would from the more precise relative motion signals available in the light. Here we tested an alternative hypothesis: the immediate correction effect is driven by motion parallax resulting from movements of the head, and motion parallax (the speed of head-centric motion that results from a head rotation) is a function of the direction of the object relative to the head. The effect could result from cues provided by knowledge of the surrounding environment, and indeed, a recent study found that the immediate correction effect is reduced in the dark (Pochopien & Fahle, 2015). This is known as the immediate correction effect (Rock, Goldberg, & Mack, 1966). Prisms optically rotate the visual scene relative to the head, but the error in perceived direction that results is less than the optical deflection of the prism.
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