Kyung-hoon Cha

Stereo photography with hand phone

A mobile phone (Hand Phone) is designed to display stereo images taken from a camera attached to it. Software of processing a stereo image pair to be displayed on the display panel of the phone is developed and a detachable viewing zone forming optics is installed for the stereoscopic image generation without moires. Since the phone is operating only in the palm of the phones owner, special cares needed in photographing the image pair are described.

10.1: Crosstalk Simulation for Polarization Switching 3D LCD Display

In this paper, we introduce Crosstalk definition of Polarization Switching 3D LCD display and scrutinize the relation between Crosstalk and parameters which give influence to Crosstalk throughout simulation. This result can give efficient guidelines to design Polarization Switching 3D LCD display having Crosstalk as less as possible.

See-through multi-view 3D display with parallax barrier

In this paper, we propose the see-through parallax barrier type multi-view display with transparent liquid crystal display (LCD). The transparency of LCD is realized by detaching the backlight unit. The number of views in the proposed system is minimized to enlarge the aperture size of parallax barrier, which determines the transparency. For compensating the shortness of the number of viewpoints, eye tracking method is applied to provide large number of views and vertical parallax. Through experiments, a prototype of see-through autostereoscopic 3D display with parallax barrier is implemented, and the system parameters of transmittance, crosstalk, and barrier structure perception are analyzed.

Stereoscopic three-dimensional television using active glasses with switchable refraction

Abstract. We have devised a full-resolution stereoscopic television system incorporating both a patterned retarder and active glasses. Selective vision of the left image by the left eye and the right image by the right eye is achieved by a conventional combination of a patterned retarder and left and right polarized filters. Full resolution is provided by the active components of the glasses acting as a switchable refractive-type beam displacer. Pairs of line-interleaved images are displayed on an LCD screen sequentially at a frame rate of 120 Hz. With the help of active refraction glasses, the viewer can see full-resolution stereoscopic images as if they are displayed in an interlaced manner. Active glasses are flicker-free. Measured stereoscopic crosstalk is 0.6%, which is defined only by the performance of the patterned retarder.

Development of Time-Multiplexed Autostereoscopic Display Based on LCD Panel

The main advantage of time-multiplexed stereoscopic display is that high-resolution stereoscopic images can be displayed using single monitor. In a time-multiplexed stereoscopic system left and right images of a stereopair consequently appear on the screen of 2-D display. The viewer is able to see the left and right images separately due to special shutter glasses or passive polarized eyeglasses combined with a polarization switch, sequentially occluding the left and the right eyes, thus preventing the viewer’s eyes from seeing wrong images. Since conventional 2-D images and components of the stereopair may be displayed with the same full resolution of the image panel, 2-D / 3-D switching of the display is potentially unnecessary. Both 3-D and 2-D content can be displayed on the same screen simultaneously. Time-multiplexed stereoscopic systems, utilizing polarization shutter glasses and polarization switchable screens are well-known and have been the objective of much research [1,2,3,4,5]. The shutter glasses system has two wearable optical switches, capable of switching their transparency thus blocking the left or right eye. The passive polarized eyeglasses system has one large (screen size) optical polarization switch switchable between two

LCD-based stereoscopic imaging system

A LC panel is layered on the LCD panel with the same pixel structure by matching each pixel to display stereoscopic images. The images for the LCD and LC panels are prepared by taking square root of sum of squared intensities and intensity ratio, respectively, of corresponding pixels from the stereoscopic image pair. The layered LCD panel enables to display each view image of the stereoscopic image pair with the full resolution of the panel and stereoscopic images with high quality.

Projection-type integral 3D imaging using multifacet flat mirrors

We propose a projection-type integral imaging scheme using multi-facet flat mirrors and demonstrate its feasibility. Instead of spherical mirrors on a flat surface, multi-facet flat mirrors which contacts with the tangential line of a curved surface function like elemental mirror component. Lights reflected from different facet of each mirrors give different viewing perspectives. By using electronic capturing and display devices, the proposed method makes it possible to record and reconstruct 3D scene in real-time. In the experiment, only horizontal parallax is provided because one-dimensional surface can be made more easily. But extension for two-dimensional or computer generation of elemental images can also be done.