自由曲面数字化测量中黏性目标识别技术研究

Identification of Viscous Target in Free-form Surface Digital Measurement

自由曲面数字化测量中,由于传感器单元测量区域较小或被测物体本身遮挡等特性的限制,实现整体测量需要进行多次的图像拼接。黏性目标的应用较好地解决了空间图像拼接中不同坐标系的转换与统一。提出了一种基于不变曲线矩法对多重圆弧平面型黏性目标进行识别的技术。这种方法可以准确地对黏性目标进行识别,同时具有较强的鲁棒性。根据这种方法实现的三维空间距离测量相对误差优于0.6%。

In the digital measurement for free-form surface,Image mosacis are needed to achieve the whole measurement for the smaller measuring field of sensor unit or the feature limitations of the measure object.Viscous target can solve the transformation and the integration of several coordinate systems in space image mosaics.In this paper,an identification technology for the planar multi-arc viscous target was presented which is based on the invariable curve-moment.This method can identify viscous target exactly and has strong robustness.The fractional error of 3-D space distance measured with this method excels 0.6%.