Integral 3D imaging is getting much attention as one of the viable candidates for natural 3D display. Compared with other stereoscopic techniques, it provides more freedom of viewing and sense of naturalness with reduced eye fatigue. Recently several approaches on the projection integral imaging have been issued because of its merits for large size implementation. However, the use of a concave or convex lens array can cause problems of high cost and spherical aberration. To overcome these problems, we propose a novel scheme using multi-facet flat mirrors and demonstrate its feasibility. Instead of spherical mirrors in a flat surface, multi-facet 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 be also done. Some detailed discussions on the design parameters will be shown in the presentation.
The colorimetric model for predicting the luminance and chromaticity coordinates produced by Digital Light Processing (DLP) Projection (PJ) TV has been proposed. A series of test colors were measured. A polynomial function fitted the tone reproduction curves with five coefficients per RGB primary channel. The characterization of neutral color due to the use of spoke light was discussed. Experimental results showed that the proposed method is very effective in the colorimetry in DLP PJ TV.
The color characterization of a DLP (digital light processing) PJ (projection) TV is studied by changing the picture modes. After measuring the chromaticity coordinates, luminance, and spectral radiance of red-green-blue and white as a function of the digital-analog convert value, the contrast ratio, white luminance, chromaticity constancy, channel independency are analyzed. And then colorimetric models for producing desired colors on DLP PJ TV are studied. The performances of GOG (gain-offset-gamma) model and 1-D LUT (look up table) model are evaluated by comparing Δ Eab between measured and predicted values for 56 target colors.
For evaluating the surface of parabolic mirror (90 mm, F/0.76), two different null test have been discussed. After designing, encoding, and fabricating the CGH(computer generated hologram), the null CGH test was performed. An autocollimation test with a flat mirror was also performed and these testing result were compared.
We construct the modulation transfer function (MTF) measurement system of a LCD using a linear charge-coupled device (CCD) imager. The MTF used in optical system can not describe in the effect of both resolution and contrast on the image quality of display. Thus we present the new measurement method based on the transmission property of a LCD. While controlling contrast and brightness levels, the MTF is measured. From the result, we show that the method is useful for describing of the image quality. A ne measurement method and its condition are described. To demonstrate validity, the method is applied for comparison of the performance of two different LCDs.