Being 3 dimensional frame of reference proofreading

摘要

PPROBLEM TO BE SOLVED: To provide a three-dimensional coordinate system calibration method for calibrating the three-dimensional coordinate system indicating the position of an inner surface of a pneumatic tire without using any calibration tool such as a calibration cube in an inner surface shape measurement system of the pneumatic tire. PSOLUTION: The three-dimensional coordinate system calibration method comprises a first image pickup step S10 of picking up an image of a marker 20 by using a plurality of cameras in a normal state of a pneumatic tire 10, a moving step S20 of moving a marker forming area of the pneumatic tire 10 including the marker 20 in the predetermined direction by deforming the pneumatic tire 10 from a normal state to a deformed state, a second image pickup step S30 of picking up an image of the marker 20 by using a plurality of cameras 30 in the deformed state of the pneumatic tire 10, a reference cube preparing step S40 of preparing a reference cube for calibration by using the normal data for calibration and the deformation data for calibration, and a calibration step S50 for calibrating a three-dimensional coordinate system by using the reference cube for calibration. PCOPYRIGHT: (C)2010,JPO&INPIT