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Zoom lens calibrating method and device

A calibration method and zoom lens technology, applied in image data processing, instruments, calculations, etc., can solve troublesome problems and achieve the effect of improving convenience

Inactive Publication Date: 2011-06-29
CHINA DIGITAL VIDEO BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method will be more troublesome in terms of implementation. If the image analysis method is used to find the corners of the sign board in an outdoor noisy environment, it may fail

Method used

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  • Zoom lens calibrating method and device
  • Zoom lens calibrating method and device
  • Zoom lens calibrating method and device

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Embodiment Construction

[0039] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] refer to figure 1 , which shows a flow chart of the steps of an embodiment of a calibration method for a zoom lens according to the present invention, which may specifically include the following steps:

[0041] Step 101, calibrate the internal parameters of the shortest focus of the camera;

[0042] In practice, the internal parameters of the camera at the shortest focus time can be calibrated by using the method proposed by Zhang Zhengyou to calibrate all the internal and external parameters of the camera using multiple plane templates - the plane calibration method. In this method, the camera intrinsic parameter matrix is:

[0043] K = f ...

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Abstract

The invention discloses a zoom lens calibrating method, comprising the following steps of: calibrating internal parameters at the time of the shortest focal length of a camera; acquiring a group of zoom images of an outdoor scene by the camera at a fixed position by zooming; respectively extracting a plurality of characteristic points of every two adjacent zoom images, and matching the characteristic points; and calculating zooming parameters of the current camera according to the internal parameter and the matched characteristic points. In the invention, no landmark is adopted, and convenience in implementation can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of TV program production, in particular to a zoom lens calibration method and a zoom lens calibration device. Background technique [0002] The purpose of camera calibration is to start from the image information acquired by the camera, calculate the geometric information of the object in the three-dimensional space, and reconstruct and recognize the object. The relationship between the three-dimensional geometric position of a point on the surface of a space object and its corresponding point in the image is determined by the geometric model of the camera imaging, and these geometric model parameters are calibration parameters. Specifically, the calibration parameters include external parameters and internal parameters, wherein the external parameters include geometric information such as the position and attitude of the camera, and the internal parameters include optical parameters such as the focal length...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 谢宏
Owner CHINA DIGITAL VIDEO BEIJING