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Self-Calibrated Structured Light 3D Scanner Using Color Edge Pattern

Authors:
Samuel Kosolapov

Keywords: image processing; 3D scanner; structured light; color edge detector

Abstract:
A prototype of general-purpose fast and inexpensive non-laser structured light self-calibrated 3D scanner using a unique color edge pattern was designed, built and tested. The main elements of the 3D scanner are non-laser slide projector and inexpensive WEB camera. The pattern projected to the colored 3D object in test consists of a plurality of a pairs of color strips, white strips and black strips. In the simplest implementation, three basic complimentary colors {M, Y, C} were used, effectively creating at least 6 unique color edges. The addition of black and white delimiter strips enables the creation of a pattern containing 32 easily recognized edges in the simplest implementation and 153 color edges in case six colors {R, G, B, M, Y, C} are used. Color edges can be easily (and unambiguously) detected on the true-color 2D images of the 3D object in-test (grabbed by WEB camera) which enable the reconstruction of the 3D shape from a single 2D frame. Optional mechanical translation of the pattern enables the increase in the number of edges and, after applying a sequence of image processing algorithms, the building of a true color 3D model of the scanned 3D object. In order to lessen pure acquisition time (when 3D object in test must not move), special auto-calibration elements were integrated into scanner mechanical construction so that auto-calibration and 3D reconstruction steps are executed after acquisition is finished. Scanner prototype was tailored to scan 3D shape of human foot with a 3D accuracy of about 0.5 mm in less than 2 sec, which is adequate for the selected exemplary application: individual insoles design and production.

Pages: 86 to 90

Copyright: Copyright (c) IARIA, 2012

Publication date: July 22, 2012

Published in: conference

ISSN: 2308-4162

ISBN: 978-1-61208-220-2

Location: Nice, France

Dates: from July 22, 2012 to July 27, 2012