A Novel Geometric Calibration Technique for Scalable Multi- projector Displays

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.