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Study on Distortion Compensation of Underwater Archaeological Images Acquired through a Fisheye Lens and Practical Suggestions for Underwater Photography - A Case of Taean Mado Shipwreck No. 1 and No. 2 -

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  • 발행기관
    한국문화유산보존과학회(구 한국문화재보존과학회) 바로가기
  • 간행물
    보존과학회지 KCI 등재 바로가기
  • 통권
    제37권 제4호 (2021.08)바로가기
  • 페이지
    pp.312-321
  • 저자
    Young-Hwa Jung, Gyuho Kim, Woo Sik Yoo
  • 언어
    영어(ENG)
  • URL
    https://www.earticle.net/Article/A398645

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원문정보

초록

영어
Underwater archaeology relies heavily on photography and video image recording during surveillances and excavations like ordinary archaeological studies on land. All underwater images suffer poor image quality and distortions due to poor visibility, low contrast and blur, caused by differences in refractive indices of water and air, properties of selected lenses and shapes of viewports. In the Y ellow S ea ( between mainland China a nd t he Korean p eninsula), t he v isibility underwater i s f ar l ess than 1 m, typically in the range of 30 cm to 50 cm, on even a clear day, due to very high turbidity. For photographing 1 m x 1 m grids underwater, a very wide view angle (180o) fisheye lens with an 8 mm focal length is intentionally used despite unwanted severe barrel-shaped image distortion, even with a dome port camera housing. It is very difficult to map wide underwater archaeological excavation sites by combining severely distorted images. Development of practical compensation methods for distorted underwater images acquired through the fisheye lens is strongly desired. In this study, the source of image distortion in underwater photography is investigated. We have identified the source of image distortion as the mismatching, in optical axis and focal points, between dome port housing and fisheye lens. A practical image distortion compensation method, using customized image processing software, was explored and verified using archived underwater excavation images for effectiveness in underwater archaeological applications. To minimize unusable area due to severe distortion after distortion compensation, practical underwater photography guidelines are suggested.

목차

ABSTRACT
1. INTRODUCTION
2. MATERIALS AND METHODS
2.1. Underwater photographs
2.2. Underwater photography equipment
2.3. Image analysis software
3. RESULTS AND DISCUSSION
3.1. Origin of image distortion
3.2. Underwater photography
3.3. Requirement for underwater photography in limited visibility
3.4. Types of image distortion
3.5. Software-based distortion compensation
3.6. Discussion
4. CONCLUSION
REFERENCES

키워드

Underwater archaeology Fisheye lens Image analysis software Barrel distortion Pincushion distortion Distortion compensation

저자

  • Young-Hwa Jung [ Kongju National University, National Research Institute of Maritime Cultural Heritage ]
  • Gyuho Kim [ Kongju National University, Kongju 32588, Korea ]
  • Woo Sik Yoo [ WaferMasters, Inc., Dublin, CA 94568, USA, Institute of Humanities Studies, Kyungpook National University, Daegu 41566, Korea ] Corresponding Author

참고문헌

자료제공 : 네이버학술정보

간행물 정보

발행기관

  • 발행기관명
    한국문화유산보존과학회(구 한국문화재보존과학회) [The Korea Society of Conservation Science for Cultural Heritage]
  • 설립연도
    2003
  • 분야
    자연과학>자연과학일반
  • 소개
    본 법인은 문화재 과학적 보존에 관한 제반 학술적 연구 발전 보급을 위하여 문화재 보존기술 개발과 수리 및 복원에 관한 방법을 연구함으로서 문화재의 보존 및 계승에 기여함을 그 목적으로 한다.

간행물

  • 간행물명
    보존과학회지 [Journal of Conservation Science]
  • 간기
    연5회
  • pISSN
    1225-5459
  • eISSN
    2287-9781
  • 수록기간
    2003~2026
  • 등재여부
    KCI 등재
  • 십진분류
    KDC 602 DDC 700

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