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A Novel Geometric Calibration Technique for Scalable Multi- projector Displays



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ECE TECHNICAL REPORT CSP 06 010 A Novel Geometric Calibration Technique for Scalable Multiprojector Displays Veeraganesh Yalla Laurence G Hassebrook Center for Visualization and Virtual Environments Department of Electrical Computer Engineering University of Kentucky Lexington KY 25 September 2006 Copyright 1 Abstract We present a novel geometric calibration technique for scalable multi projector displays Geometric calibration plays an important role in the alignment of multi projector systems to present a seamless tiling of the multiple projector displays Multi frequency Phase Measuring Profilometry technique for the geometric calibration is proposed in this work The required framework for implementing the technique is already part of the scalable displays using camera for optical feedback Instead of performing feature matching or corner detection to estimate the projector camera homography the proposed technique has projector camera correspondence for each pixel in the camera space with sub pixel accuracy Structured light illumination is widely used in 3D depth acquisition The proposed method can be further extended to scan any 3D display surface and use the calibration matrices to map visualization data using the multi projector display Keywords Scalable Multi Projector Displays Geometric Calibration Structured Light Illumination Sub pixel 1 Introduction Multi projector displays are increasingly becoming a common trend to visualize high resolution information on large display walls Automatic alignment of the multiple projector systems and photometric calibration are two important steps involved in configuring the display systems Raskar et al 1 proposed a general solution to the seamless display problem A series of pre calibrated stereo cameras are used to define the display surface and the intrinsic and extrinsic parameters of the individual projectors The computation time and resources required to implement this technique is quite complex Chen et al 2 proposed



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