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We have developed a viewing point detection system using specific image processing for an eye-position tracking autostereoscopic display. The system consists of a CCD camera with a coaxial IR light illuminator and an image processing unit. The image processing unit executes two specific processes. The first process enhances viewer's pupils form his/her image to obtain stable viewer pupil extraction. The second process predicts the viewing point in the even the viewer blinks. In applying the system to an eye-position tracking autostereoscopic display, it was confirmed that the system offers stable and continuous tracking performance.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

We have developed an eye-position tracking stereoscopic projector which employs image shifting optics. The display allows 3D images to be viewed without special glasses from any position along a lateral axis. Its image shifting device contains a plane parallel glass plate and is installed in a liquid crystal projector. Refraction produced by inclination of the glass plate shifts the optical axis of the projected image. Since the only moving part in the optics is the lightweight glass plate, the response of the image shifting device is both fast and precise enough for interactive 3D-CAD and virtual reality applications. To improve the system's interactive response, we have widened the stereoscopic viewing area by adding a device which causes the image to vibrate laterally. Also we use a new tracking algorithm which reduces the tracking error that would ordinarily be created by delay time. Experimental results confirm the success of these improvements.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

A new liquid crystal projector for a work station with high resolution, high level brightness and multisynchronous functions has been developed. It produces a high quality image showing 1280 X 1024 color pixels through a-Si TFT liquid crystal light valves and a high luminous flux at 400 lm through the use of a novel polarization converter. The projection mechanism can be employed not only in front and rear projector, with a screen projection size of up to 200', but also in a novel console type projector with a 70' screen. These projectors can be used for multi media displays, for example, as an electrical overhead projector or a tele-conference system, connected to a work station or a personal computer in the office.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

A high-brightness liquid crystal light valve (LCLV) projector, in which three amorphous Si TFT-addressed LCLVs are used, has been developed for laroe screen displays. By using a newly developed polarization converter, about twice the brightness has been realized compared to using a conventional sheet polarizer. The polarization converter principle is to efficiently convert an unpolarized light from a light source into a linearly polarized light, used to illuminate a twisted nematic LCLV. The LCLV has 240 x 756 pixels in the 4.3 inch diagonal area. High-brightness full-color images with 120 ft-L brightness have been obtained, when projected onto a 5.0 gain 80 inch diagonal screen using a 300W Xenon arc lamp.© (1990) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.