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。

In this paper, we designed a measuring frame of multi-camera capture apparatus under semi-circular confi guration. The position control devices control cameras to the assigned locations along the semi-cicular frame as the specifi ed imaging taken positions; and then the cameras controlled by the rotation control devices fi xed on a rotary mechanism would point to the predefi ned angles, so that the system measuring range can be fl exibly modifi ed. 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 defi ned by the semicircular frame. Thank to the geometrical constraint, the system internal- and external- parameters can be rapidly calibrated while the system is reassembled in the fi led. Here in this paper, the system calibration for both near- and far- fi eld cases and the geometrical reconstruction of a circular tube is also demonstrated.