Advanced color projector design based on human visual system

Date of Award


Degree Name

M.S. in Electrical Engineering


Department of Electrical and Computer Engineering


Advisor: Keigo Hirakawa


The current designs of color video projectors suffer from color errors commonly referred to as rainbow artifact. In this thesis, we propose new projector hardware and processing technique that reduce these artifacts signicantly. The hardware and preprocessing designs are tested in simulation by generating a video sequence that can be viewed on a 120 Hz monitor. Our contributions are in three parts. We first propose the notion of rendering error, or an error in the projected image perceived by the human visual system. We then propose spatial-temporal color wheel design incorporated the requirements for the zero rendering error condition and amplitude demodulation. The output was satisfactory, although it required a modified color wheel. Finally, we propose preprocessing scheme that reduce rendering error by introducing a correction term to cancel the predicted rendering error. This technique can be applied to traditional color wheels, and it was verified on RGB and RGBWW color wheels.


Projectors Design and construction, Color motion pictures Processing, Color vision

Rights Statement

Copyright 2011, author