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Proceedings Paper

Vision-based algorithms for high-accuracy measurements in an industrial bakery
Author(s): Paulo Heleno; Roger Davies; Bento A. Brazio Correia; Joao Dinis
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Paper Abstract

This paper describes the machine vision algorithms developed for VIP3D, a measuring system used in an industrial bakery to monitor the dimensions and weight of loaves of bread (baguettes). The length and perimeter of more than 70 different varieties of baguette are measured with 1-mm accuracy, quickly, reliably and automatically. VIP3D uses a laser triangulation technique to measure the perimeter. The shape of the loaves is approximately cylindrical and the perimeter is defined as the convex hull of a cross-section perpendicular to the baguette axis at mid-length. A camera, mounted obliquely to the measuring plane, captures an image of a laser line projected onto the upper surface of the baguette. Three cameras are used to measure the baguette length, a solution adopted in order to minimize perspective-induced measurement errors. The paper describes in detail the machine vision algorithms developed to perform segmentation of the laser line and subsequent calculation of the perimeter of the baguette. The algorithms used to segment and measure the position of the ends of the baguette, to sub-pixel accuracy, are also described, as are the algorithms used to calibrate the measuring system and compensate for camera-induced image distortion.

Paper Details

Date Published: 11 February 2002
PDF: 8 pages
Proc. SPIE 4567, Machine Vision and Three-Dimensional Imaging Systems for Inspection and Metrology II, (11 February 2002); doi: 10.1117/12.455249
Show Author Affiliations
Paulo Heleno, Instituto Nacional de Engenharia e Technologia Industrial (Portugal)
Roger Davies, Instituto Nacional de Engenharia e Technologia Industrial (Portugal)
Bento A. Brazio Correia, Instituto Nacional de Engenharia e Technologia Industrial (Portugal)
Joao Dinis, Instituto Nacional de Engenharia e Technologia Industrial (Portugal)


Published in SPIE Proceedings Vol. 4567:
Machine Vision and Three-Dimensional Imaging Systems for Inspection and Metrology II
Kevin G. Harding; John W. V. Miller, Editor(s)

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