Multi-projector geometric calibration error analysis

In recent years, multi-projector display technique has been widely applied in such fields as exhibition, release of new product and virtual simulation etc. However, up to now there is not a complete set of multi-projector geometric calibration error analysis method. In this paper, a set of error assessment methods is proposed based on the analysis of the characteristics of multi-projector geometry calibration, including autocorrelation projection error (i.e. errors from the projector itself after the geometric correction) and cross-correlation projection error (i.e. errors between adjacent projectors). Firstly, the key parameter of the autocorrelation projection error (i.e. reprojection error) is proposed, which describes the accuracy between the real position of each pixel point and the expected position. Average reprojection error, maximum reprojection error and key points match error are used to improve the system. Secondly, the key parameter of the cross-correlation projection error (i.e. overlay area error) which describes the accuracy of the corresponding pixels between the adjacent projectors is proposed, and average overlay area error and maximum overlay area error are used to improve the evaluation system. Finally, the proposed method is used to analyze the projection errors of plane surfaces, curved surfaces and arbitrary display surfaces. Theoretical analysis and experimental results demonstrate that the proposed method can effectively evaluate the accuracy of multi-projector geometry calibration.