关键词: 定位, 数字化测量, 粘性目标, 自由曲面

Abstract: In the digital measurement for free-form surface, image mosaics are needed to achieve the whole measurement for the small measuring field of sensor unit. The idea of viscous target for free-form surface measurement is presented which refers to the concept and the applying of control points in the photographic measurement. According to the comparisons about the styles of some viscous targets, a planar multi-arc viscous target is designed. With similar features, viscous targets can be pre-located automatically and can be located accurately by ellipse fitting. Location precision of the method excels 0.05 pixels.

Key words: Digital measurement, Free-form surface, Location, Viscous target