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Telephoto camera calibration method based on polynomial projection model

A calibration method and focus camera technology, applied in image data processing, instruments, calculations, etc., can solve problems such as small viewing angle, poor perspective effect, neglect of longitudinal depth, etc., and achieve the effect of low operational complexity requirements

Inactive Publication Date: 2012-08-01
ZHEJIANG UNIV
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Problems solved by technology

[0005] 2) Small viewing angle
[0006] 3) Poor perspective effect
However, this model ignores the longitudinal depth in the direction of the optical axis of the scene, and is only limited to a narrow field of view (o ) lenses are not suitable for telephoto cameras with different focal lengths (focal length > 50mm)

Method used

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  • Telephoto camera calibration method based on polynomial projection model
  • Telephoto camera calibration method based on polynomial projection model
  • Telephoto camera calibration method based on polynomial projection model

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] figure 1 The technical flow of the telephoto camera calibration method is given. The process includes calibration of internal and external references.

[0024] Telephoto camera calibration includes the following five parts: Obtain multiple images of the checkerboard calibration plate with clear imaging; Harris corner point extraction: mark all the corner point positions on the calibration board on each image, and use the Harris corner point extraction method to automatically extract the corner points to obtain the corresponding point set on the image; Internal parameter calculation: use the internal parameter calculation method of the perspective model to obtain the focal length , the center of the image and projected model coefficients The initial result, and then optimize the internal parameters according to the projection...

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Abstract

The invention discloses a telephoto camera calibration method based on a polynomial projection model. Orthogonal projection models are mostly used in existing methods, focal length parameter limit is high, and an application range is narrow. The novel projection model is used for describing a projection process of a telephoto camera, points on an image are converted onto a spherical surface, and internal reference optimization is realized according to projection properties of straight lines on the spherical surface. External reference is solved by the aid of a projection relation among the points on the spherical surface and points on a calibration plate, and finally the internal reference and the external reference are optimized in a combined manner. The telephoto camera calibration method is generally applicable to telephoto lenses with different focal lengths, and has the advantages of high antijamming property, simple experimental facilities and high precision and flexibility.

Description

technical field [0001] The invention relates to a parameter calibration method of a telephoto camera in the field of computer vision, specifically a method for obtaining internal parameters and external parameters of a telephoto lens camera based on a plurality of images of a calibration plate taken. Background technique [0002] The telephoto camera is usually used in the field of photogrammetry. Its main feature is to focus on specific objects and to zoom in on the details of distant scenes. [0003] Compared with ordinary cameras, telephoto cameras have the following characteristics: [0004] 1) The depth of field is shallow. Since the telephoto lens focuses on the details of the distant scene, it only has a clear image within a limited range; [0005] 2) The viewing angle is small. The relatively narrow viewing angle is determined by the long focal length, so that within the effective imaging range, the details can be more prominent; [0006] 3) The perspective effec...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 龚小谨林颖刘济林
Owner ZHEJIANG UNIV
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