![]() The luminance distribution characteristics of the iris plane for a single projector are shown in Fig. We measured the luminance distribution of the iris plane imaged by the optical screen. We report here the results of the above experiments.ģ.1 Luminance distribution on the new optical screen We made a 50-inch prototype of the spatially imaged iris plane screen and conducted experiments to measure the luminance distribution and to project multi-viewpoint images. In addition, this screen is thin and flexible, and because it is a front projection type, it can easily be installed in a smaller space than that required for the conventional rear projection type. ![]() Therefore, it is considered that the smooth luminance distribution characteristics accompanying the movement of the viewpoint necessary for linear blending can be achieved. When the diffusion characteristics are narrowed, the light from the projector gathers in a narrow range. When the iris plane of the projector is sufficiently small, the luminance distribution around the line of the projection plane can be controlled by the characteristics of the anisotropic diffusion layer. Structure of spatially imaged iris plane screen. This screen forms an iris plane at position d that satisfies 1 / f = 1 / a + 1 / d, assuming that the projection distance on the front surface of the screen is a and the focal length of the Fresnel lens is f.įig. This screen consists of a reflective layer, a UV (ultraviolet) polymerized Fresnel lens layer, and an anisotropic diffusion layer, as shown in Fig. We developed a spatially imaged iris plane screen that presents an image of the iris plane of the projector in the air. The only problem with the earlier prototype is that we were unable to easily increase the size of the display area or widen the viewing area due to physical constraints of the optical lens system. We verified this principle earlier with a prototype based on conventional optical lenses and thus demonstrated the viability of a natural glassless 3D display harnessing both motion parallax and binocular parallax. 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. A number of methods have been proposed for glassless three-dimensional (3D) displays that include motion parallax. ![]()
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