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Title:	Real-Time Implementation of a Color Sorting System
Author(s):	Srikanteswara, Srikathyanyani; Lu, Qiang; King, William; Drayer, Thomas; Conners, Richard; Kline, D. Earl; Araman, Philip A.
Date:	1997
Source:	Proceedings, SPIE. 3205: 170-179.
Description:	Wood edge glued panels are used extensively in the furniture and cabinetry industries. They are used to make doors, tops, and sides of solid wood furniture and cabinets. Since lightly stained furniture and cabinets are gaining in popularity, there is an increasing demand to color sort the parts used to make these edge glued panels. The goal of the sorting processing is to create panels that are uniform in both color and intensity across their visible surface. If performed manually, the color sorting of edge-glued panel parts is very labor intensive and prone to error. This paper describes a complete machine vision system for performing this sort. This system uses two color line scan cameras for image input and a specially designed custom computing machine to allow real-time implementation. Users define the number of color classes that are to be used. An ãoutä class is provided to handle unusually colored parts. The system removes areas of character mark, e.g., knots, mineral streak, etc., from consideration when assigning a color class to a part. The system also includes a better face algorithm for determining which part face would be the better to put on the side of the panel that will show. The throughput is two linear feet per second. Only a four inch between part spacing is required. This system has under gone extensive in plant testing and will be commercially available in the very near future. The results of this testing will be presented.
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