Development of a 3D Vision Range Sensor Using Equiphase Light Section Method

Abstract

Many autonomous and industrial robots require three-dimensional (3D) environmental sensors. Stereovision or laser range finders are often used to detect distance to obstacles or targets. We propose 3D measurement system using active stereovision based on light section and phase shift. A special light source consisting of a rotating cylinder and a lamp projects planes of lights whose intensities vary sinusoidally over time. Each plane phase differs from those of other planes, so we distinguish which plane sectioned the target from the phase. Images from the video camera are processed into phases of each pixel that indicate distance to measured targets. This needs only simple calculation for phase detection and simultaneously operates multiple systems. The basic principle and expansion for practical use are proposed and experimental results are detailed using a trial, verifying the proposal’s effectiveness.