Large field-of-view (FOV) calibration is indispensable to ensure the accuracy of vision measurement systems for large aviation components. We propose an improved separated-parameter calibration method for large-FOV binocular vision measurements with a high flexibility and accuracy. Firstly, the camera parameters are separately calibrated according to the sub-area features of image. Subsequently, based on the spatial-calibration accuracy, a stereoscopic calibration object is devised. The mean error of the proposed method is experimentally obtained as 0.13 mm for a FOV of 2.0 m × 1.5 m. Its feasibility and effectiveness for the measurement in the field is validated by workshop calibration.

中文翻译：

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改进的用于大视场的双目视觉测量的分离参数校准方法。

大视野（FOV）校准对于确保用于大型航空部件的视觉测量系统的准确性必不可少。我们提出了一种改进的分离参数校准方法，用于大视野双目视觉测量，具有很高的灵活性和准确性。首先，根据图像的分区特征分别校准摄像机参数。随后，基于空间校准精度，设计立体校准对象。对于2.0 m×1.5 m的FOV，实验得出的平均误差为0.13 mm。通过现场校准验证了其在现场进行测量的可行性和有效性。