지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2012.1
- 수록면
- 182 - 188 (7page)
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초록· 키워드
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Background/Aims: Three-dimensional (3D) imaging is gaining popularity and has been partly adopted in laparoscopic surgery or robotic surgery but has not been applied to gastrointestinal endoscopy. As a first step, we conducted an experiment to evaluate whether images obtained by conventional gastrointestinal endoscopy could be used to acquire quantitative 3D information.
Methods: Two endoscopes (GIF-H260) were used in a Borrmann type I tumor model made of clay. The endoscopes were calibrated by correcting the barrel distortion and perspective distortion. Obtained images were converted to gray-level image, and the characteristics of the images were obtained by edge detection. Finally, data on 3D parameters were measured by using epipolar geometry, two view geometry, and pinhole camera model.
Results: The focal length (f) of endoscope at 30 mm was 258.49 pixels. Two endoscopes were fixed at predetermined distance, 12 mm (d12). After matching and calculating disparity (v2-v1), which was 106 pixels, the calculated length between the camera and object (L) was 29.26 mm. The height of the object projected onto the image (h) was then applied to the pinhole camera model, and the result of H (height and width) was 38.21 mm and 41.72 mm, respectively. Measurements were conducted from 2 different locations. The measurement errors ranged from 2.98% to 7.00% with the current Borrmann type I tumor model.
Conclusions: It was feasible to obtain parameters necessary for 3D analysis and to apply the data to epipolar geometry with conventional gastrointestinal endoscope to calculate the size of an object.
목차
등록된 정보가 없습니다.
참고문헌 (16)
참고문헌 신청
Fox WC / 2008 / Intraoperative acquisition of three-dimensional imaging for frameless stereotactic guidance during transsphenoidal pituitary surgery using the Arcadis Orbic S
Hasegawa K / 2001 / Endoscope system for high-speed 3D measurement / Syst Comput Jpn 32 : 30 ~ 39
Heikkila J / 2000 / Geometric camera calibration using circular control points / IEEE Trans Pattern Anal Mach Intell 22 : 1066 ~ 1077
Hofmeister J / 2001 / Perceptual aspects of two-dimensional and stereoscopic display techniques in endoscopic surgery: review and current problems / Semin Laparosc Surg 8 : 1
Kannala J / 2006 / A generic camera model and calibration method for conventional, wide-angle, and fish-eye lenses / IEEE Trans Pattern Anal Mach Intell 28 : 1335 ~ 1340
Hasegawa K / 2001 / Endoscope system for high-speed 3D measurement / Syst Comput Jpn 32 : 30 ~ 39
Heikkila J / 2000 / Geometric camera calibration using circular control points / IEEE Trans Pattern Anal Mach Intell 22 : 1066 ~ 1077
Hofmeister J / 2001 / Perceptual aspects of two-dimensional and stereoscopic display techniques in endoscopic surgery: review and current problems / Semin Laparosc Surg 8 : 1
Kannala J / 2006 / A generic camera model and calibration method for conventional, wide-angle, and fish-eye lenses / IEEE Trans Pattern Anal Mach Intell 28 : 1335 ~ 1340
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