A HIGH-SPEED AND CONTINUOUS 3D MEASUREMENT SYSTEM

A new system for high-speed and continuous 3D measurement is presented . It is based on the slit-ray projection method. The key component is the image plane constructed by a position-sensitive device (PSD) array that is horizontally unsegmented and linear, but vertically numbered. All PSD row elements are attached to their respective analog signal p rocessors. The analog signals are multiplexed and digitized by multipl exers and A/D converters at appropriate sampling intervals and stored in memory. By virtue of this configuration of the image plane, basis d ata for 3D measurement are acquired during only one scan of the slit r ay at high speed in the form of memory addresses and data. Moreover, i f we use large capacity and/or dual port memories, we can continuously obtain 3D range data for as many scenes as needed. The trial system h as been implemented with a newly designed 128-channel PSD array and ha s verified our method, enabling us to obtain successive 3D range data at video rates with an error within +/-0.3%.