Multi-Projector Calibration Based on Virtual Viewing Space

Liu Xizuo,Lin Yan,Ma Liang,Xu Xiaogang

doi:10.20870/ijvr.2019.19.3.2918

Abstract

In large-scale maritime maneuvering simulators, the multi-channel systems are usually used to tile multiple projectors on a cylindrical display to create a large virtual environment, which brings more realistic immersion to the users. In the non-planar multi-projector display system, to finish the work of geometric and photometric corrections, there exist the problems of difficult projector calibration, more manual intervention and poor adaptability. In order to solve these problems, a multi-projector calibration based on virtual viewing space is proposed in this paper. First, a virtual environment of multiple projectors is created, and by using the structured light and re-projection model on a cylindrical wall, the calibration of internal and external parameters of a projector are realized separately. Finally, the geometric correction is completed by the mapping relationship between the target images and the calibrated re-projected images. This method is free of limitation by the angle of view of a single camera and can calibrate any of the projectors in the multi-channel systems. The example results show that the projector’s parameters can be estimated more accurately, and the efficiency and accuracy of geometric correction can be improved. Good results are achieved when applying this method in the maritime maneuvering simulator system.

Highlights

High-resolution and wide-field displays create an immersive visual experience that facilitates applications such as remote collaboration, scientific visualization, and human-computer interaction (Yicheng and Yong, 2013; Yiyu et al, 2013)
This paper proposes a multi-projector calibration based on virtual viewing space (VVS) for the cylindrical display wall in a maritime simulator
Compared with the real space, we can quickly construct the display wall and the projector model in VVS, which is convenient to establish a 3D mapping between the projector and the screen, and improve the efficiency of geometric correction and the scope of application

Summary

Introduction

High-resolution and wide-field displays create an immersive visual experience that facilitates applications such as remote collaboration, scientific visualization, and human-computer interaction (Yicheng and Yong, 2013; Yiyu et al, 2013). In the maritime maneuvering simulator, the multi-projector display wall often adopts a 180degree or even 360-degree cylindrically non-planar display, and the multi-channel visual simulation system is used to project a completely virtual environment image onto the curved display wall, which gives the user a more realistic immersion (Yicheng and Yong, 2013). In this system, geometric and photometric corrections are the key technologies, and geometric correction is the premise and foundation of the display system, which directly affects the display results.

Results

Discussion

Conclusion