吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (4): 1266-1273.doi: 10.13229/j.cnki.jdxbgxb201504035

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An algorithm of optical radiometric compensation for projective system of large-scale orthogonal multi-screens

HAN Cheng1, 2, ZHANG Chao1, QIN Gui-he2, XUE Yao-hong1, YANG Fan1, FAN Jing-tao1, LIU Wen-jing1   

  1. 1.College of Computer Science and Technology, Changchun University of Science and Technology, Changchun 130022, China;
    2. College of Computer Science and Technology, Jilin University, Changchun 130012, China
  • Received:2013-11-12 Online:2015-07-01 Published:2015-07-01

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Abstract: In order to eliminate the effects of optical radiation between adjacent projection screens in CAVE systems, an optical radiometric compensation model is established according to the spatial distribution of optical luminance of cosine radiator. Besides, an optical radiometric parallel compensation algorithm is designed based on GPU technology. By analysis of current CAVE systems, it can be concluded that parallel compensation algorithm can achieve the best compensation result through multi-level compensation. In the first compensation level, more than 80% of optical radiometric influence can be eliminated and only about a quarter of the image is severely affected. When the overall multi-level compensation among multi-projection images is considered, the video displayed on the projective system of large-scale orthogonal multi-screens must be pre-compensated. Therefore, a fast optical radiometric compensation method is proposed according to the analysis of compensation results. This method is applied in two special theaters of large-scale orthogonal multi-screens, and it is demonstrated that images with uniform color and brightness within the distinguishing range of human eyes can be achieved.

Key words: virtual reality, multi-projection system, image processing, optical radiation compensation, parallel computing

CLC Number: 

  • TP391.9
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