Hui Nam

8.2: A High Resolution Autostereoscopic Display Employing a Time Division Parallax Barrier

We have developed the high-resolution auto-stereoscopic 3D display for the first time in the world. For this, we suggested time division(TD) parallax barrier method. For the time division multiplexing image separation, we have adapted 2.2″ AMOLED panel for Imager and we have fabricated fast driving circuit, which operated in more than 240Hz frame rate. Also we have designed and fabricated OCB mode LC barrier shutter for fast responses. We can see 3-D image at 300mm viewing distance with 3-D resolution that is same as 2-D resolution.

7.3: Auto-Stereoscopic Swing 3D Display

We have developed auto-stereoscopic swing 3D display for the first time in the world. It makes us to feel stereoscopically the images of portrait and landscape mode simultaneously by rotating the display. We have designed a black and white liquid crystal display as parallax barrier so that it is convertible electrically between 2D and 3D mode. We have used 2.2″ QVGA AM TFT LCD as 2D imager for mobile application. To improve 3D image quality we have designed and developed the various patterns of liquid crystal barrier and to improve 3D brightness we have designed and developed the new backlight schemes of LCD module.

Volumetric three-dimensional display using projection CRT

Volumetric 3D display systems have been expected to be able to reproduce natural view without eye fatigue. We have developed a prototype of the volumetric 3D monochromatic display system. It consists of a flat screen rotating at the speed of 1200 rpm(rotations per minute) and a synchronized projection engine. The projection engine can project 300 image slices per one rotation of the screen, so that we can see the continuous real three-dimensional image by residual images to human eyes. For this prototype, we use a 7 inch green projection CRT that is used in projection TVs as a two-dimensional image engine. In order to rapidly scan 3D display space, vector (random) scanning rather than normal raster scanning is used. We specially designed a lenticular type screen that has such a shape as to achieve constant gain over 180 degrees horizontal viewing angle. To collimate and redirect the light rays, Fresnel lenses and projection lens system are used, and to hide mirrors from viewers viewing zone, off-axis optics are used. To obtain a stable volumetric three-dimensional image, the projected two-dimensional images and the positions of the screen should be synchronized. We devise a new algorithm that reconstructs the contour data of image slices from real three-dimensional shape. Vibration and noise is minimized. Brightness is not a problem and high enough resolution for relatively simple images can be achieved. A new version of full color and the higher resolution is on the way.

55.2: Auto-stereoscopic 3D Display Apparatus using Projectors and LC Image-splitter

We have developed a prototype of auto-stereoscopic 3-dimensional display system with 2 projectors and new LC Image splitter. We use two LCD projectors, one for the right and the other for the left stereoscopic image. The polarizations of light from each projector are perpendicular to each other. We specially designed a projection screen comprised of Fresnel lenses, LC image splitter and lenticular lens to separate right and left images for certain ranges of viewing angle.

28.3: Dense Disparity Map Calculation from Color Stereo Images using Edge Information

We have developed the stereo-corresponding algorithm using edge information. The conventional stereo-corresponding algorithm, SAD (Sum of Absolute Difference), has a good quality in case of texture region, but it has a false matching in the non-texture region. In order to reduce the false matching in the non-texture region, the new cost function, which is defined as SED (Sum of Edge Difference) based on the global optimization, is added to the cost function of SAD. We evaluate our algorithm and benchmark Middlebury database. The experimental results show that our proposed algorithm successfully produces piecewise smooth disparity maps while reducing the false matching in the non-texture region. Moreover, our algorithm is faster in getting the best quality than SAD.

P‐50: 42‐inch PDP Autostereoscopic 3D Display

We have made a 42-inch PDP autostereoscopic three-dimensional display. A sheet of lenticular lens is placed in front of a 42-inch PDP of full color XGA. The surface temperature of a PDP can be high during its operating times. The pitch of lenticular lens may be expanded. It makes an undesirable problem of deteriorating the 3D image quality. To overcome this problem, we have developed a 3D simulator to design a lenticular lens properly and measured the thermal expansion ratio of the lenticular lens and the surface temperature of the PDP. These two measured values have been used in the design of lenticular lens.