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Proceedings Paper

Counting colored objects using highlights
Author(s): Henryk Palus
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Paper Abstract

Object counting in the scene can be used for visual inspection processes. Highlights are the characteristic bright spots occurring on the surfaces of individual objects. In this work the importance of highlights in image processing is described and some reflection models are briefly reviewed. First of all the possibilities of the Dichromatic Reflection Model (DRM) are presented. The paper presents a new idea of object counting based on highlights counting on surfaces of objects. Object counting is composed of following stages: extraction of highlights in color image by thresholding of selected IHS components, morphological consolidation of extracted highlight regions and region counting (labeling) in binary image. Object counting takes into consideration the number of used light sources, because in case of more than one lighting source multiple highlights per object are observed. This is realized without using reflection model. The proposed method was tested for a number of different, real world images. Input images were acquired directly from 1-CCD color camera without preprocessing. Best results were achieved for optically inhomogeneous (e.g. plastic) chromatic objects in dark background. Typical lighting system based on two fluorescent tubes (5400 K) was used. The method seems promising for practical applications.

Paper Details

Date Published: 16 September 1999
PDF: 8 pages
Proc. SPIE 3826, Polarization and Color Techniques in Industrial Inspection, (16 September 1999); doi: 10.1117/12.364310
Show Author Affiliations
Henryk Palus, Silesian Technical Univ. (Poland)

Published in SPIE Proceedings Vol. 3826:
Polarization and Color Techniques in Industrial Inspection
Elzbieta A. Marszalec; Emanuele Trucco, Editor(s)

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