Döner perde kullanan 3 boyutlu gözlüksüz projeksiyon ekranı

A new technique for glasses free (autostereoscopic) and multiview 3D display is proposed and demonstrated in this thesis. The technique uses two mobile projectors, a rotating retro-reflective diffuser screen rotated by a mechanical unit, a pupil tracking camera and a computer. Two mobile projectors project stereo images onto a transfer screen composed of a retroreflector and a 1D diffuser. The transfer screen forms two viewing slits through each of which only one image of stereo image pair is seen. The mechanical unit rotates the transfer screen around its center according to the viewer's position obtained by the pupil tracker. As the screen is rotated accordingly, the viewing slits track the viewer's eyes. Thus, a single viewer can perceive 3D in a large viewing field. Images from different perspectives can be presented to the viewer using the information from the pupil-tracker. Advantages of the proposed technique compared to conventional autostereoscopic projection displays are as follows: it requires only two projectors rather than an array of projectors; there is no image registration problem on the screen once the projectors are aligned; the viewing slits remain aligned with the viewer's pupils, thus the viewer never perceives discrete transitions between different perspectives; the technique can provide high gain, and sufficient brightness using low power mobile projectors. In order to demonstrate capabilities of the proposed technique, a prototype was developed. The prototype consists of two laser based pico projectors using MEMS scanners , a retro-reflective diffuser screen as a transfer screen, pupil-tracker, rotating mechanism which rotates the transfer screen around its center, and a personal computer to provide content and closed-loop control of the tracker and the screen. The resulted prototype presents stereo images to a single viewer without need of any glasses. The screen is circular with 60cm diameter and the image is a rectangular image that fits on the screen and viewed from about 100cm distance. The prototype allows the viewer to move approximately 70 cm along the horizontal axis, and 50 cm along the vertical axis with an average crosstalk below 5 percent. The display quality in terms of brightness and crosstalk has been measured and reported for different types of light diffusers.