Geometric and Photometric Calibration for Tiling Multiple Projectors with a Pan-Tilt-Zoom Camera
Date Issued
2004
Date
2004
Author(s)
Wu, Yen-Nien
DOI
en-US
Abstract
Over the past few years a considerable number of studies have been made on building large, high-resolution displays. The aim of this thesis is to build a seamless large-scale display system by tiling multiple projectors with the help of a pan-tilt-zoom camera. It adds to the display world by combining different techniques to create a large, high-resolution, and low-cost display system. This research takes two tasks into consideration when producing the seamless display: (1) the geometric calibration and (2) the photometric calibration.
Here, I develop a vision-based approach to accomplish these tasks by utilizing a pan-tilt-zoom video camera. Compared to previous work, my method for geometric calibration is more accurate because I have a much higher resolution (because I combine several zoom-in images). And it does not require a camera calibration, nor does it require the 3D geometry estimation of the display surface. As opposed to using the spectroradiometer, an expensive device previously used for color calibration, a camera is used due to its low cost. I take advantage of high dynamic range image to estimate the real color, and with a mapping between it and the colorimeter. With photometric calibration, the color across the different projectors will become uniform. This system has great potential for many applications that require large format and high resolution display, such as scientific visualizations and visual display wall.
Subjects
色彩校正
視訊顯示牆
旋轉式可變焦攝影機
色度計
多台投影機疊合
幾何校正
Geometric Calibration
Pan-Tilt-Zoom Camera
Colorimeter
Visual Display Wall
High Dynamic Range Image
Photometric Calibration
Multi-projector Tiling
Type
thesis
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