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Camera Calibration Technique for Rotation Parameters Using an Image of Three Sets of Straight Lines

IP.com Disclosure Number: IPCOM000035749D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Echigo, T: AUTHOR

Abstract

This article describes a new method of three-dimensional (3D) camera calibration, in which the rotation parameters are decoupled from the translation parameters. The characteristic feature of this method is that the rotation parameters are obtained by projecting three sets of parallel lines independent of the translation parameters and the imaging distance from the lens to the image plane. This is because the virtual line passing through the image center, which is calculated by perspective projection of a set of parallel lines, depends only on the rotation parameters.

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Camera Calibration Technique for Rotation Parameters Using an Image of Three Sets of Straight Lines

This article describes a new method of three-dimensional (3D) camera calibration, in which the rotation parameters are decoupled from the translation parameters. The characteristic feature of this method is that the rotation parameters are obtained by projecting three sets of parallel lines independent of the translation parameters and the imaging distance from the lens to the image plane. This is because the virtual line passing through the image center, which is calculated by perspective projection of a set of parallel lines, depends only on the rotation parameters.

The purpose of the camera calibration is to establish the relationship between 3D world coordinates and their corresponding 2D image coordinates seen by the camera. Once this relationship is established, 3D information can be inferred from 2D images. A camera has six degrees of freedom; that is, camera parameters consist of three rotation para

(Image Omitted)

meters that give the orientation and three translation parameters that give the position. The imaging distance from the lens to the image plane should also be included in the camera parameters: they must be calibrated every time the camera is set up, and it is, therefore, necessary to establish a conventional camera calibration method.

Fig. 1 shows a set of parallel straight lines in the 3D world and their corresponding projection image on the image plane. They are related by perspective transformatio...