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Camera calibration method based on one-dimensional feature of balls

A camera calibration and sphere technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as inconvenient use, affecting calibration results, and complex calibration

Inactive Publication Date: 2013-08-21
XIDIAN UNIV
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  • Claims
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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a camera calibration method based on the one-dimensional characteristics of a sphere, which aims to solve the problems of complex calibration, inconvenient use, and influence on the calibration results in the existing calibration methods

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  • Camera calibration method based on one-dimensional feature of balls
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Embodiment Construction

[0071] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0072] figure 1 It shows the flow of the camera calibration method based on the one-dimensional characteristic of the sphere provided by the present invention. For ease of illustration, only the parts relevant to the present invention are shown.

[0073] The camera calibration method based on the one-dimensional characteristic of the sphere of the present invention, the camera calibration method based on the one-dimensional characteristic of the sphere comprises the following steps:

[0074] Use the camera to take multiple images of a single sphere, extract the contour edge of the sphere projection in the image, solve the...

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Abstract

The invention discloses a camera calibration method based on a one-dimensional feature of balls. According to the camera calibration method based on the one-dimensional feature of the balls, the centers of the two balls in different spatial positions and the middle point of a ball center connecting line serve as a one-dimensional calibration object, a plurality of images of one ball at any spatial position are shot, the edge point coordinates of the projection of each ball in the images are extracted, a ball projection quadratic curve is fitted and solved, and the projections of the balls are drawn on the same image; then the projection of the center of each ball is calculated; finally projections of a plurality of sets of ball centers and the projections of the middle points of the ball center connecting lines are obtained, the length ratio of the ball center connecting lines is calculated, and the spatial depth of the center of each ball and camera parameters are further calculated. The camera calibration method based on the one-dimensional feature of balls does not need a traditionally manufactured rod-shaped 1D calibration object, adopts the balls to replace the one-dimensional calibration object, and is suitable for calibration of a multi-camera system due to the fact that the balls are suitable for being observed from any direction. Besides, by means of the camera calibration method, the colinearity of marked points is guaranteed, automatic extraction of the outline of the calibration object is easy, and improvement of accuracy of the projection positions of the centers of the balls is achieved.

Description

technical field [0001] The invention belongs to the field of photogrammetry and computer vision, in particular to a camera calibration method based on the one-dimensional characteristic of a sphere. Background technique [0002] Camera calibration has always been an important issue in photogrammetry and computer vision. At present, there are many camera calibration methods. The early camera calibration methods used three-dimensional calibration objects. Due to the difficulty in making three-dimensional calibration objects, they have been gradually replaced by plane calibration objects. Instead, however, with the emergence and development of multi-camera systems, due to the different viewing angles of multiple cameras, the planar calibration object cannot make multiple cameras with different viewing angles visible at the same time. [0003] Multi-camera calibration often uses a calibration method based on 1-dimensional calibration objects (ZhangZ.Y..Camera calibration with on...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 贾静姜光王阳
Owner XIDIAN UNIV
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