Video-rate or high-precision: a flexible range imaging camera

Adrian A. Dorrington; Michael J. Cree; Dale A. Carnegie; Andrew D. Payne; Richard M. Conroy; John P. Godbaz; Adrian P. P. Jongenelen

doi:10.1117/12.764752

26 February 2008 Video-rate or high-precision: a flexible range imaging camera

Adrian A. Dorrington, Michael J. Cree, Dale A. Carnegie, Andrew D. Payne, Richard M. Conroy, John P. Godbaz, Adrian P. P. Jongenelen

Author Affiliations +

Proceedings Volume 6813, Image Processing: Machine Vision Applications; 681307 (2008) https://doi.org/10.1117/12.764752
Event: Electronic Imaging, 2008, San Jose, California, United States

Abstract

A range imaging camera produces an output similar to a digital photograph, but every pixel in the image contains distance information as well as intensity. This is useful for measuring the shape, size and location of objects in a scene, hence is well suited to certain machine vision applications. Previously we demonstrated a heterodyne range imaging system operating in a relatively high resolution (512-by-512) pixels and high precision (0.4 mm best case) configuration, but with a slow measurement rate (one every 10 s). Although this high precision range imaging is useful for some applications, the low acquisition speed is limiting in many situations. The system's frame rate and length of acquisition is fully configurable in software, which means the measurement rate can be increased by compromising precision and image resolution. In this paper we demonstrate the flexibility of our range imaging system by showing examples of high precision ranging at slow acquisition speeds and video-rate ranging with reduced ranging precision and image resolution. We also show that the heterodyne approach and the use of more than four samples per beat cycle provides better linearity than the traditional homodyne quadrature detection approach. Finally, we comment on practical issues of frame rate and beat signal frequency selection.

Citation Download Citation

Adrian A. Dorrington, Michael J. Cree, Dale A. Carnegie, Andrew D. Payne, Richard M. Conroy, John P. Godbaz, and Adrian P. P. Jongenelen "Video-rate or high-precision: a flexible range imaging camera", Proc. SPIE 6813, Image Processing: Machine Vision Applications, 681307 (26 February 2008); https://doi.org/10.1117/12.764752

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