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    Author(s): R. Edward Thomas
    Date: 2013
    Source: In: Miller, Gary W.; Schuler, Thomas M.; Gottschalk, Kurt W.; Brooks, John R.; Grushecky, Shawn T.; Spong, Ben D.; Rentch, James S., eds. Proceedings, 18th Central Hardwood Forest Conference; 2012 March 26-28; Morgantown, WV; Gen. Tech. Rep. NRS-P-117. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 325-334.
    Publication Series: Paper (invited, offered, keynote)
    Station: Northern Research Station
    PDF: Download Publication  (1.08 MB)

    Description

    Laser scanning of hardwood logs provides detailed high-resolution imagery of log surfaces. Characteristics such as sweep, taper, and crook, as well as most surface defects, are visible to the eye in the scan data. In addition, models have been developed that predict interior knot size and position based on external defect information. Computerized processing of complete log shape data, combined with predicted internal defect information, promises to reduce waste and improve grade recovery in primary breakdown operations. RAYSAW is a hardwood log sawing research tool that processes high-resolution 3D laser-scan data and uses internal defect prediction models to estimate the occurrence of defects on sawn board faces. RAYSAW uses mathematically based ray-tracing image generation methods to generate virtual boards that can be graded, remanufactured, or processed into dimension parts using available free software. The RAYSAW sawing simulator allows researchers to examine the impacts of various sawing practices and log quality and shape characteristics on grade and value recovery.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Thomas, R. Edward. 2013. RAYSAW: a log sawing simulator for 3D laser-scanned hardwood logs. In: Miller, Gary W.; Schuler, Thomas M.; Gottschalk, Kurt W.; Brooks, John R.; Grushecky, Shawn T.; Spong, Ben D.; Rentch, James S., eds. Proceedings, 18th Central Hardwood Forest Conference; 2012 March 26-28; Morgantown, WV; Gen. Tech. Rep. NRS-P-117. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 325-334.

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https://www.fs.usda.gov/treesearch/pubs/44098