Shape measurement using an experimental untracked range sensor

George K. Knopf; Archana Sangole; Jonathan Kofman

doi:10.1117/12.467719

18 October 2002 Shape measurement using an experimental untracked range sensor

George K. Knopf, Archana Sangole, Jonathan Kofman

Proceedings Volume 4902, Optomechatronic Systems III; (2002) https://doi.org/10.1117/12.467719
Event: Optomechatronic Systems III, 2002, Stuttgart, Germany

Abstract

An experimental shape measurement system that does not require peripheral sensors to track the position and orientation of the sensor-head is described in this paper. The prototype consists principally of a multiple-line light projector and a CCD camera. The light projection unit uses a low-power diode laser with a single line-generator and several dichroic cube beamsplitters. This simple hardware configuration creates three parallel line profiles with unique intensity values due to the transmission and reflection properties of the constituent beamsplitters. To eliminate background information, a bandpass filter with a peak response near the wavelength of the laser source is placed over the camera lens. The CCD camera acquires images of distorted light patterns as the sensor-head is swept across the object surface. The coordinate points of the parallel profiles in each view are recovered relative to the sensor head using a nonlinear image-to-object coordinate calibration technique. Where partial overlap exists between adjacent views, a multi-view registration algorithm can be applied. In the proposed registration method, the geometry of the surface in each view is approximated prior to computation of the sensor transformation. These synthetic surfaces are used to establish the corresponding features in adjacent views that are necessary to compute the translation and rotation parameters of the sensor-head. The potential of the surface-measurement method is demonstrated using narrow overlapping views.

Citation Download Citation

George K. Knopf, Archana Sangole, and Jonathan Kofman "Shape measurement using an experimental untracked range sensor", Proc. SPIE 4902, Optomechatronic Systems III, (18 October 2002); https://doi.org/10.1117/12.467719

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