3-D Measurement of Objects in Water Using the Light Stripe Projection Method

Abstract

In this paper, we propose a 3-D measurement method of objects' shapes in liquid using the light stripe projection method. When applying vision sensors to measuring objects in liquid, we meet the problem of an image distortion. It is caused by the light refraction on the boundary between the air and the liquid, and the distorted image brings errors in a triangulation for the range measurement. Our proposed method can measure the accurate 3-D coordinates of object surfaces in liquid taken for calculating the refraction effect. The effectiveness of the proposed method is shown through experiments.