Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Development of a Tree Ring Measuring Program Using Smartphone-Captured Images

스마트폰 촬영 이미지를 활용한 나이테 검출 및 분석 프로그램 개발

  • Kim, Dong-Hyeon (Department of Ecology and Environment System, Kyungpook National University) ;
  • Kim, Tae-Lee (Department of Software, Kyungpook National University) ;
  • Cho, Hyung-Joo (Department of Software, Kyungpook National University) ;
  • Kim, Dong-Geun (Department of Ecology and Environment System, Kyungpook National University)
  • 김동현 (경북대학교 생태환경시스템학과) ;
  • 김태이 (경북대학교 소트프웨어학과) ;
  • 조형주 (경북대학교 소트프웨어학과) ;
  • 김동근 (경북대학교 생태환경시스템학과)
  • Received : 2020.08.25
  • Accepted : 2020.11.11
  • Published : 2020.12.31
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Abstract

In this study, to solve the existing inefficient stem analysis process and expensive equipment cost problems, a method for detecting and analyzing tree rings using smartphone images was proposed and a semi-automated computer program (TRIO, Tree Ring Information) was developed. TRIO can measure the annual ring radius and save the results to Excel. Since TRIO uses smartphone images, the results may vary depending on the quality of the smartphone camera. Therefore, using the Samsung Galaxy S10 and Tap 2, 30 dics images of Pinus rigida were acquired and analyzed, and these were compared with WinDENDROTM. As a result of the study, both Samsung Galaxy S10 and S2 showed significant results with WinDENDROTM, and the R2 value of S10 had a high correlation as 0.976, and RMSE was analyzed as 0.4199, and very similar results were output. The R2 value of S2 was 0.975 and the RMSE was 0.4232, showing no significant difference from S10. Accordingly, the TRIO developed in this study analyzed the annual radius value very similar to WinDENDROTM.

본 연구는 고가의 나이테 분석 장비에서 탈피하고 손쉽게 나이테 분석작업을 수행하기 위해 스마트폰 촬영 이미지를 활용할 수 있는 컴퓨터 프로그램인 TRIO(Tree Ring Information)를 개발하였다. TRIO는 반 자동형 컴퓨터 프로그램이며, 스마트폰 촬영 이미지를 활용해 1년 단위별 나이테 반경을 측정하고, 결과를 엑셀로 저장한다. 카메라 성능에 따른 결과를 비교하기 위해 삼성 갤럭시 S10과 삼성 갤럭시 탭 S2로 기종을 달리하여 30개의 리기다소나무 원판의 4방위 이미지를 취득하고 WinDENDROTM와 1년 단위별 나이테 반경을 측정한 결과를 비교하였다. 연구 결과, 삼성 갤럭시 S10과 S2 모두 WinDENDROTM와 유의한 결과를 나타내었고, S10의 R2 값이 0.976으로 높은 상관관계를 가졌으며, RMSE는 0.4199로 분석되어 매우 유사한 결과를 출력하였다. S2의 R2 값은 0.975, RMSE은 0.4232로 S10과 큰 차이가 나타나지 않았다. 이에 따라 본 연구에서 개발한 TRIO는 WinDENDROTM와 매우 유사한 1년 단위별 반경 값을 분석하였다.

Keywords

References

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