Optimization of Image Qualities in Polarized Stereoscopic System
Date Issued
2014
Date
2014
Author(s)
Lin, Pei-Feng
Abstract
We adopt two projectors to project left and right images separately in polarized stereoscopic system. The light passes through the optical components such as polarizers and retarders. Finally, the observers can watch the stereoscopic images. Because of the screen size and projection distance, light is projected from the projector with an oblique angle of 35 degrees in the polarized stereoscopic system. Under this situation, observers will suffer from worse image qualities due to crosstalk or color shift when they are with severe head rotation. We can use the simulation method to calculate crosstalk by using the representative Jones matrix of polarizer and quarter-wave retarder and calculating the product of Jones matrices for the system. We can evaluate the color shift for images by chromatic diagram and color shift formula based on CIE 1976. We can optimize the image qualities by designing the angles of stacked retarder for minimizing crosstalk or color shift under different angles of head rotation and light incidence. We can find the optimized retarder angles by using exhausted method to achieve the optimization of crosstalk and color shift under different angles of head rotation and light incidence. We want to reduce the crosstalk within long wavelength range, but we don''t want the crosstalk to get worse within wavelength range during optimizing crosstalk. Due to the crosstalk problem, we propose a solution with a certain maximum residue levels of crosstalk. We can achieve 16% improvement ratio under head rotation of 15 degrees and 60% improvement ratio in head rotation of 45 degrees with 20% maximum residue levels. We can achieve color shift optimization under head rotation situation just as under no head rotation situation. When we want to optimize crosstalk and color shift simultaneously, we try to analyze the importance of crosstalk and color shift and conclude that crosstalk is more important than color shift in image qualities optimization. If we adopt the criterion of crosstalk being 10 times important than color shift, we can get the maximum optimized value of 1 for crosstalk. Instead of getting better crosstalk, we suffer from worse color shift. But the worse value of color shift is within the range of 0.0001 to 0.0009. The difference is negligible. We will not only tune the retarder angles but also design different materials and thickness to further improve crosstalk and color shift in the future and achieve better image qualities in polarized stereoscopic system.
Subjects
ploarized glasses
crosstalk
color shift
stereoscopic display
Type
thesis
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