A next Generation Processing System for Edging and Trimming
نویسندگان
چکیده
This paper describes a prototype scanning system that is being developed for the processing of rough hardwood lumber. The overall goal of the system is to automate the selection of cutting positions for the edges and ends of rough, green lumber. Such edge and trim cuts are typically performed at sawmills in an effort to increase board value prior to sale, and this depends on a balance between large board size and the removal of undesirable wood characteristics, such as wane and surface defects. This paper is primarily concerned with image acquisition and analysis. Offthe-shelf hardware components are used with in-house developed software to capture images of a board as it moves longitudinally on a conveyor. Unlike most board-scanning systems, the system described here analyzes rough (unplaned) boards. There are some advantages to this approach, such as increased image contrast due to surface moisture. There are also disadvantages, however, resulting from the appearance of the wood in its unplaned state, which pose new challenges in the development of image-analysis algorithms.
منابع مشابه
Real-Time Value Optimization of Edging and Trimming Operations for Rough, Green Hardwood Lumber
For edging/trimming operations in hardwood sawmills, an operator examines both sides—or just the waney-edged side—of each board, and makes a quick assessment of grade potential. The operator then decides where to edge and/or trim the board to achieve the intended grade and, presumably, maximum value. However, human operators can only achieve lumber values that are 62-78% of optimal. To achieve ...
متن کاملOptimum edging and trimming of hardwood lumber
Before the adoption of an automated system for optimizing edging and trimming in hardwood mills, the performance of present manual systems must be evaluated to provide a basis for comparison. A study was made in which lumber values recovered in actual hardwood operations were compared to the output of a computer-based procedure for edging and trimming optimization. The optimization procedure wa...
متن کاملAutomatic Scanning of Rough Hardwood Lumber for Edging and Trimming
Scanning of unplaned, green hardwood lumber has received relatively little attention in the research community. This has been due in part to the difficulty of clearly imaging fresh-cut boards whose fibrous surfaces mask many wood features. Nevertheless, it is important to improve lumber processing early in the manufacturing stream because much wood material is needlessly edged and trimmed away ...
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Due to the limited capability of board defect scanners, not all defect information required to make the best edging and trimming decision can be scanned for use in an automated system. The objective of the study presented in this paper was to evaluate the lumber value obtainable from edging and trimming optimization using varying levels of defect information as input. In an earlier study (5), a...
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