360º PROFILE MEASUREMENT USING A NOVEL

IMAGE CONNECTION METHOD

ZHANG Xiaoling  LIN Yuchi  WU Bo  ZHAO Meirong  HUANG Yinguo

(State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University,Tianjin 300072)

Abstract: In order to measure the 360º geometry profile of complicated object, a novel method to implement the measurement of object’s 360°profile is proposed. In the grating projection profilometry, when the measured object is rotated round X-axis, object’s 3D profiles corresponding with different rotating angle can be gotten. In our method, the above profiles data in the respective single-view coordinate system are firstly transformed into the data in the same coordinate system by transform matrix which is derived from translation matrix and rotation matrix; A new “mask matrix method” is also proposed and employed to connect the transformed profiles data into the 360º profile of object. Experiment results show that the present method can get 360º profile of the measured object fast and well, in which only four objects’ 3D profiles corresponding with four rotating angle, namely 0º, 90º, 180º, 270º are proceeded. It can measure the geometry profile not only of the continuous shape but also of the discontinuous shape.

Key words: Image connection  Grating projection profilometry  Phase shift 360º profile measurement  Coordinate transform   Mask matrix method

CLC No: TN247

教育部科学技术研究重点资助项目(99140). Received 20050517, received in revised form 20051118