KR970028632A - Distortion Correction Method for Cameras with Wide Angle Lenses - Google Patents

Distortion Correction Method for Cameras with Wide Angle Lenses Download PDF

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Publication number
KR970028632A
KR970028632A KR1019950039718A KR19950039718A KR970028632A KR 970028632 A KR970028632 A KR 970028632A KR 1019950039718 A KR1019950039718 A KR 1019950039718A KR 19950039718 A KR19950039718 A KR 19950039718A KR 970028632 A KR970028632 A KR 970028632A
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South Korea
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resolution
obtaining
camera
vertical
horizontal
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KR1019950039718A
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Korean (ko)
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KR100250223B1 (en
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류창우
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김종진
포항종합제철 주식회사
신창식
재단법인 산업과학기술연구소
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Priority to KR1019950039718A priority Critical patent/KR100250223B1/en
Publication of KR970028632A publication Critical patent/KR970028632A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives

Abstract

광각 렌즈를 장치한 카메라에서 발생하는 왜곡을 교정하는 방법에 관한 것으로, 광각렌즈를 가지는 카메라에서 발생하는 왜곡을 교정하기 위한 방법으로서, 동심원의 그림과 격자평판을 이용하여 광중심을 구하는 단계와, 수직 방향의 해상도를 수평의 해상도와 같게 변환하는 변환함수를 구하는 단계와, 다변 해상도를 균일 해상도로 교정하는 교정함수를 구하는 단계로 구성되는 것이기 때문에, 종래의 왜곡 교정방법보다 교정오차가 작게 나타난다.A method of correcting distortion generated by a camera equipped with a wide-angle lens, the method for correcting distortion generated by a camera having a wide-angle lens, the method comprising: obtaining a light center using a concentric picture and a lattice plate; Since a conversion function for converting the vertical resolution to the same as the horizontal resolution is obtained, and a correction function for correcting the multilateral resolution to a uniform resolution, the correction error appears smaller than that of the conventional distortion correction method.

Description

광각렌즈를 가지는 카메라의 왜곡 교정 방법Distortion Correction Method for Cameras with Wide Angle Lenses

제5도는 렌즈 왜곡을 교정하는 변환함수를 구하는 방법을 설명하는 블럭도,5 is a block diagram illustrating a method of obtaining a conversion function for correcting lens distortion;

제6도는 교정함수를 구한 후 입력 영상에서 교정을 수행하는 절차를 설명하는 블럭도,6 is a block diagram illustrating a procedure for performing calibration on an input image after obtaining a calibration function;

제7도는 (a) 내지 (c)는 격자 평판의 영상을 나타낸 정면도로써, (a)는 입력 영상을 나타낸 상태, (b) 교정 출력된 영상을 나타낸 상태, (c)는 출력 영상을 선형 보간한 상태임.7 is a front view showing an image of a lattice plate, (a) shows an input image, (b) shows a calibrated output image, and (c) shows linear interpolation of an output image. In one state.

Claims (4)

광각렌즈를 가지는 카메라에서 발생하는 왜곡을 교정하기 위한 방법으로서, 동심원의 그림과 격자평판을 이용하여 광중심을 구하는 단계와, 수직 방향의 해상도를 수평의 해상도와 같게 변환하는 변환함수를 구하는 단계와, 다변 해상도를 균일 해상도로 교정하는 교정함수를 구하는 단계로 구성되는 것을 특징으로 하는 광각렌즈를 가지는 카메라의 왜곡 교정 방법.A method for correcting distortion generated by a camera having a wide-angle lens, the method comprising: obtaining a light center using a picture of a concentric circle and a lattice plate; and obtaining a conversion function for converting a vertical resolution to a horizontal resolution; And obtaining a correction function for correcting the multi-sided resolution to a uniform resolution. 제1항에 있어서, 동심원의 그림과 격자평판을 이용하여 광중심을 구하는 단계는, 균일한 간격으로 수직/수평 방향으로 격자가 그려져 있는 평판위에 몇 개의 동심원을 고정시키고, 카메라로 그 영상을 획득하여 동심원의 중심점이 격자의 임의의 교차점에 일치되게 고정시키며, 카메라를 상하좌우로 조금씩 움직여 각 동심원이 중심점을 구하여 중심점이 일치하도록 하는 것임을 특징으로 하는 광각렌즈를 가지는 카메라의 왜곡 교정 방법.The method of claim 1, wherein the obtaining of the optical center using a concentric drawing and a lattice flat plate comprises fixing several concentric circles on a flat plate on which the lattice is drawn in a vertical / horizontal direction at uniform intervals, and acquiring the image with a camera. And fix the center points of the concentric circles to match any intersection point of the grid, and move the cameras up, down, left, and right little by little to obtain the center points so that the center points coincide with each other. 제1항에 있어서, 상기 수직방향의 해상도를 수평의 해상도와 같게 변환하는 변환함수를 구하는 단계는, 입력영상에서 가로격자와 세로격자가 만나는 교차점을 입력점으로 선택하여 입력점들의 직각 좌표값을 구하고, 이것을 광중심을 원점으로 하는 구좌표값을 구하며, 광중심을 기준으로 수직 방향으로의 격자간 교차점의 반경과, 수평 방향으로 격자간 교차점의 반경을 구하는 것임을 특징으로 하는 광각렌즈를 가지는 카메라의 왜곡 교정 방법.The method of claim 1, wherein the obtaining of a conversion function for converting the resolution in the vertical direction to the same as the horizontal resolution comprises selecting an intersection point where the horizontal grid and the vertical grid meet in the input image as an input point to determine rectangular coordinate values of the input points. A camera having a wide-angle lens, wherein a spherical coordinate value is obtained using the optical center as the origin, and the radius of the intersection point between the grids in the vertical direction and the radius of the intersection point between the grids in the horizontal direction is obtained from the optical center. Distortion correction method. 제1항에 있어서, 상기 다변 해상도를 균일 해상도로 교정하는 교정함수를 구하는 단계는, 다음 행렬 방정식을 이용하여 수직 해상도를 수평 해상도와 같게 하는 교정 함수의 계수를 구하여 교정함수 C(dv)를 구하는 것을 특징으로 하는 광각렌즈를 가지는 카메라의 왜곡 교정 방법.The method of claim 1, wherein the obtaining of a correction function for correcting the multivariate resolution to a uniform resolution comprises: calculating a coefficient of a correction function for equalizing the vertical resolution to the horizontal resolution by using a matrix equation to obtain a correction function C (d v ). Method for correcting distortion of a camera having a wide-angle lens, characterized in that obtaining. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950039718A 1995-11-04 1995-11-04 Distortion correction method for camera with wide angle lens KR100250223B1 (en)

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Application Number Priority Date Filing Date Title
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KR970028632A true KR970028632A (en) 1997-06-24
KR100250223B1 KR100250223B1 (en) 2000-05-01

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KR100978469B1 (en) 2006-11-17 2010-08-26 문석환 A method for coordinate transfer
KR100953522B1 (en) * 2008-10-06 2010-04-21 인하대학교 산학협력단 Calibration Method for Underwater Camera
KR100996897B1 (en) 2009-02-10 2010-11-29 전남대학교산학협력단 correction method of Radial Distortion Based on a Line-Fitting

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