Novel Projector Calibration Method Using Geometrical Invariants
Novel Projector Calibration Method Using Geometrical Invariants
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发表时间：
2015
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通讯作者：
Tsuyoshi Shimizu;S. Kotani;Hiromi Watanabe;T. Tanzawa;N. Furuya
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作者：
Tsuyoshi Shimizu;S. Kotani;Hiromi Watanabe;T. Tanzawa;N. Furuya
在摄像机-投影机系统中，摄像机是一个光学接收器，但投影机是投影设备。虽然相机可以将三维校准点投影到图像上，但投影仪很难捕捉到它们。因此，投影仪可以获得这些校准点的方法是必要的。本文介绍了一种用平板标定摄像机-投影仪系统的简便方法。具体地，将校准点从投影仪投影到平板上，并且使用平板上的几何不变量和参考点来计算投影点的三维坐标。首先，将一组校准点从投影仪投影到校准板上。然后，相机捕获校准板的图像，其中平板的角部被用作参考点。然后计算图像中的几何不变量，并将不变量保存在三维标定板上。最后，在多次测量三维标定点后，使用张的方法对摄像机-投影仪系统进行标定。
Abstract — In a camera-projector system, the camera is an optical receiver, but the projector is projection equipment. Although the camera can project three-dimensional calibration points to an image, the projector has difficultly grabbing them. Thus, a method where the projector can obtain these calibration points is necessary. This paper describes an easy method to calibrate a camera-projector system using a flat board. Specifically, the calibration points are projected onto the flat board from the projector, and the three-dimensional coordinates of the projected points are calculated using geometrical invariants and reference points on the flat board. First, a set of calibration points is projected onto the calibration board from the projector. Then the camera captures the image of the calibration board where the corners of the flat board are used as reference points. Afterwards the geometrical invariants are calculated in the image, and the invariants are kept on the three-dimensional calibration board. Finally, Zhang's method is used to calibrate the camera-projector system after multiple measurements of the three-dimensional calibration points.