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Wood Shrinkage Measurement of Using a Flatbed Scanner

평판형 스캐너를 이용한 목재 수축률 측정

  • Park, Yonggun (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Chang, Yoon-Seong (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Yang, Sang-Yun (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Yeo, Hwanmyeong (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Lee, Mi-Rim (National Instrumentation Center for Environmental Management, Seoul National University) ;
  • Eom, Chang-Deuk (Department of Forest Products, Korea Forest Research Institute) ;
  • Kwon, Ohkyung (National Instrumentation Center for Environmental Management, Seoul National University)
  • 박용건 (서울대학교 농업생명과학대학 산림과학부) ;
  • 장윤성 (서울대학교 농업생명과학대학 산림과학부) ;
  • 양상윤 (서울대학교 농업생명과학대학 산림과학부) ;
  • 여환명 (서울대학교 농업생명과학대학 산림과학부) ;
  • 이미림 (서울대학교 농생명과학공동기기원) ;
  • 엄창득 (국립산림과학원 임산공학부) ;
  • 권오경 (서울대학교 농생명과학공동기기원)
  • Received : 2014.09.29
  • Accepted : 2014.11.07
  • Published : 2015.01.25

Abstract

Wood shrinkage, an important study subject with regard to the use of wood, has long been studied by researchers. However, when the size of a wood specimen is measured, distortion must be taken into account, which can be accomplished by applying external force on the wood specimen. However, when measuring a large number of specimens, this technique can be a lengthy process. If the size is measured and the shrinkage is calculated from images acquired with a flatbed scanner, it is possible to reduce the error in the measurement and to shorten the measurement time because the images of many specimens can be acquired with one scan. To clearly establish the boundary between a wood specimen and the background in a scan, an image threshold method was applied here. The size of a wood specimen measured by means of a scanner image was found to be longer than the value determined with a vernier caliper. The maximum pixel size of a scan image for highly accurate shrinkage calculations compared with the use of a vernier caliper was 0.053 mm/pixel.

목재 이용의 측면에서 중요한 인자 중 하나인 수축률에 관한 다양한 연구가 수행되고 있다. 버니어 캘리퍼스를 이용하여 치수를 측정할 때, 목재 시편에 작용하는 외력에 의해 왜곡된 치수가 측정될 수 있고, 시편의 양이 많으면 치수측정에 많은 시간이 소요된다. 스캐너를 이용하여 획득한 이미지로 치수를 측정하고, 수축률을 계산하면 외력이 작용하지 않아 치수 측정의 오류를 줄일 수 있고, 한 번의 스캔으로 여러 시편의 이미지를 획득하여 시간을 단축시킬 수 있다는 장점이 있다. 스캔 이미지 상에서 목재 시편과 배경 사이의 경계면을 뚜렷하게 구분할 수 있도록 threshold 방법을 적용하여 치수 측정을 용이하게 하였다. 이미지를 이용하여 측정된 목재 시편의 치수는 버니어 캘리퍼스를 이용하여 측정한 값보다 다소 크게 측정되었으며, 버니어 캘리퍼스보다 높은 정밀도로 수축률을 계산하기 위한 스캔 이미지의 최대 픽셀 길이는 0.053 mm/pixel인 것을 확인하였다.

Keywords

References

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Cited by

  1. Review on The Measurement of Wood Shrinkage vol.43, pp.6, 2015, https://doi.org/10.5658/WOOD.2015.43.6.746
  2. Dimensional Responses of Wood Under Cyclical Changing Temperature at Constant Relative Humidity vol.43, pp.5, 2015, https://doi.org/10.5658/WOOD.2015.43.5.539