矩形格子のデフオーカス投影による全空間テーブル化手法を用いた形状計測における計測精度の検討

摘要

Whole-space tabulation method(WSTM) is a technique to relate the phase of a projected grating and the coordinates at each pixel of a camera. The relation data of all the pixels are obtained in the whole-space where a reference plane is moved. The relation data are stored in tables. Thereby, WSTM is high speed and accurate shape measurement method because the coordinates are obtained by only looking up the tables without any complex calculation. Even when the brightness distribution of the projected grating is warped from cosinusoidal wave, correct coordinates are provided. In this paper, it is confirmed that accurate shape measurement can be performed by defocusing a projected grating with a rectangular brightness distribution.%格子投影法を用いた3次元形状計測手法は，多くの手法が提案されている．格子解析手法としては，近年，位相解析を行う手法がよく用いられている．位相解析手法としては，フーリエ変換を用いる手や種々の位相シフト法が開発されている．キャリブレーション手法としては，基準面を用いて画素ごとにキャリブレーションを行うことが精度のよい手法として提案されている．