Real-time close-range 3D non-contact volume and motion measurements

R. Wilson

doi:10.1117/12.2294248

1 August 1990 Real-time close-range 3D non-contact volume and motion measurements

R. Wilson

Proceedings Volume 1395, Close-Range Photogrammetry Meets Machine Vision; 139505 (1990) https://doi.org/10.1117/12.2294248
Event: Close-Range Photogrammetry Meets Machine Vision, 1990, Zurich, Switzerland

Abstract

Medical and industrial needs exist to track the position, volume and geometry of moving objects whose shapes change. Video imaging offers frame rates of sufficient frequency to support real-time sensing of fairly rapid changes in the real world. It is the processing of the video frames which represents the bottleneck in a "real- time" implementation. However, under certain limiting constraints, namely near-symmetry around a curved axis, real-time measure- ments are feasible with standard PC-based software to obtain 3-D positions, shape and volume of a moving and changing 3-D object. The paper describes a novel stereo-photogrammetric analysis system based on object silhouettes. Implementation involves the end-to-end system from video cameras to user interface and reporting of results. A medical application's scenario puts high demands on robustness and simplicity of the user interface, while operating in an entirely automated fashion. "Real-time" represents the need to process an image pair each 2 seconds. Accuracies of Ã‚Â±1% in dimension and 3% in volume are required and permit one to accept certain shortcuts in the photogrammetric approach.

Citation Download Citation

R. Wilson "Real-time close-range 3D non-contact volume and motion measurements", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 139505 (1 August 1990); https://doi.org/10.1117/12.2294248

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