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Camera calibration method and calibration apparatus thereof

A calibration device and camera calibration technology, applied in image analysis, instruments, television, etc., can solve the problems of unstable calculation of self-calibration method, difficult maintenance of three-dimensional control field, and difficulty in automation, so as to reduce manual intervention and achieve rapid automatic identification. , the effect of easy maintenance

Inactive Publication Date: 2007-08-08
WUHAN UNIV
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  • Abstract
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Problems solved by technology

There is a method of calibration based on a plane calibration field (Z. Zhang: Flexible Camera Calibration by Viewing a Plane from Unknown Orientations.Proc of 7thInt. Conference on Computer Vision, Kerkyra, Greece.pp.666-673, Sept.1999.), This method needs to take at least two images from different angles, so it needs to move the plane calibration field or camera, which is difficult to realize automation; there is calibration based on the three-dimensional control field, which is difficult to maintain and inconvenient to carry; there is no need for any The self-calibration method of the calibration field, the calculation of the self-calibration method is unstable, and it is rarely used in practical applications
In addition, in order to realize the correspondence between image point coordinates and object space point coordinates in the above method, it is generally necessary to manually specify the correspondence of several points

Method used

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  • Camera calibration method and calibration apparatus thereof
  • Camera calibration method and calibration apparatus thereof
  • Camera calibration method and calibration apparatus thereof

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Embodiment Construction

[0021] 1. Calibration device

[0022] Referring to Fig. 2, the present invention relates to the calibration device that two mutually perpendicular planes form, and mark uniform grid on two planes (grid is made up of two groups of parallel straight lines perpendicular to each other, and the intersection point of straight line is grid point). In order to enable one-to-one correspondence between the coordinates of the image point and the coordinates of the object space point, each grid point is numbered: from the bottom to the top with the O point as the center, from the inside to the outside, the column number is represented by the ones and tens, and the hundreds and The thousands place represents the line number, the ten thousand place on the left plane is 1, and the ten thousand place on the right plane is 0. For example, 11211 represents the 12th row and 11th column of the left plane, and 706 represents the 7th row and 6th column of the right plane. Then a certain number of ...

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Abstract

The invention involves a calibration device for camera calibration, which consists of two vertical grid boards that have distribution grid and the number of signs marked with a unique code point. The invention also provides a method of the camera calibration, including the following steps: (a) Acquisition of images of the calibration device; (2) corresponding coordinates of the signs point to the coordinates of object point; (3) projection the plane grid to get the initial point coordinates of grid point; (4) the use of line extraction intersection to get the precise coordinates of points; (5) The use of 3-D direct linear transformation for the initial value of calibration parameters; (6) iterative solution with beam adjustment to get the camera's internal and external orientation elements. After shooting a picture of calibration device in the invention, the follow-up calibration process can be done automatically by computer. The advantage of the invention is automatic and quickness.

Description

technical field [0001] The invention belongs to the technical field of camera calibration, and in particular relates to a camera calibration method and a used calibration device. Background technique [0002] The process of finding the internal parameters of the camera is called calibration. To restore the 3D shape using the centrally projected image, camera calibration is generally a necessary step. There are several methods for camera calibration. There is a method of calibration based on a plane calibration field (Z. Zhang: Flexible Camera Calibration by Viewing a Plane from Unknown Orientations.Proc of 7thInt. Conference on Computer Vision, Kerkyra, Greece.pp.666-673, Sept.1999.), This method needs to take at least two images from different angles, so it needs to move the plane calibration field or camera, which is difficult to realize automation; there is calibration based on the three-dimensional control field, which is difficult to maintain and inconvenient to carry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T1/00H04N13/00H04N17/00
Inventor 郑顺义张剑清施俊
Owner WUHAN UNIV
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