多視角編列數位影像關係法量測系統

Introduction of Multiple-Camera Digital Image Correlation System

黃吉宏(Chi-Hung Hwang) ； 王偉中(Wei-Chung Wang) ； 陳永祥(Yung-Hsiang Chen) ； 陳志彥(Chih-Yen Chen)

《科儀新知》 193期 (2013/04) Pp. 64-77

摘要

本研究發展可結合數位影像關係法之多攝影機取像裝置，系統採共圓架構，將攝影機侷限於半圓弧量測桿的範圍內移動，攝影機可移動至指定之相對位置定位取像。藉由轉動控制裝置，改變攝影機擷取影像角度，並經由改變攝影機平面相對夾角大小，達成快速改變攝影機影像擷取範圍。因攝影機採共圓配置，調校攝影機時，可藉由光軸中心交於共圓圓心之特性，快速完成攝影機外部參數與空間參數校正，便於現地組合量測應用。本文將介紹系統架構，以及應用此架構進行圓心內與圓心外重建影像之初步系統測試成果。

並列摘要

In this paper, we designed a measuring frame of multi-camera capture apparatus under semi-circular configuration. The position control devices control cameras to the assigned locations along the semi-circular frame as the specified imaging taken positions; and then the cameras controlled by the rotation control devices fixed on a rotary mechanism would point to the predefined angles, so that the system measuring range can be flexibly modified. All cameras are mounted on a semi-circular frame that makes intersection of all line-of-sights of cameras would locate along a line passing through the center of the semi-circular frame and perpendicular to a plan defined by the semi-circular frame. Thank to the geometrical constraint, the system internal- and external- parameters can be rapidly calibrated while the system is reassembled in the filed. Here in this paper, the system calibration for both near- and far- field cases and the geometrical reconstruction of a circular tube is also demonstrated.