投影器的标定方法

随着近景摄影测量的发展,投影器的使用越来越频繁和广泛。为了更好地使用和充分地利用投影器,需要求解投影器的内方位元素,即对投影器进行标定。提出了一种方便有效的投影器标定的方法。只需要一架投影器、一部数码相机、一个平面格网和一台计算机,设备的连接和使用相对方便灵活。基于近景摄影测量的理论,结合二维直接线性变换(2D-DLT)和共线方程,运用图像处理的方法,利用光束法平差对投影器进行标定。实验及其结果证明了该标定方法的正确性和有效性。

Calibration of slide projector

The slide projector is being frequently used in broad range of the photogrammetric measurements with the development of non-contact measurement in the close-range photogrammetry,because slide projector can project any pattern onto the measured object for controlling and calculating.Before using slide projector,the interior parameters of it have to be calibrated first.Hence,the projector calibration is a necessary and important preceding step.A flexible technique to make the calibration of slide projector was proposed.This technique only requires a slide projector,a digital camera,a planar grid and a computer.The projector calibration was achieved entirely by basing on theories of close-range photogrammetry,using the correspondence of 2D-DLT and collinear equation,exercising the image processing and making use of the whole adjustment.The feasibility and the exactness of the calibration technique of slide projector put forward are verified by the results of real experimental data.