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Light field camera calibration method based on self-matching polar triangle

A technology of light field camera and calibration method, applied in image data processing, instrumentation, calculation, etc., can solve problems such as inability to solve camera external parameters, and achieve the effect of simple and flexible design, high accuracy and robustness, and perfect functions

Inactive Publication Date: 2019-05-14
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, this method only considers the estimation of the internal parameters of the camera, and cannot solve the external parameters of the camera.

Method used

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  • Light field camera calibration method based on self-matching polar triangle
  • Light field camera calibration method based on self-matching polar triangle
  • Light field camera calibration method based on self-matching polar triangle

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0024] The invention proposes a calibration method based on a self-aligning pole triangle to calculate internal parameters and external parameters of a light field camera. The main links include: calibration plate design and projection transformation based on the Two-parallel-plane Model (TPP) coordinate system, solution of internal and external parameters of the light field camera in linear initialization, and distortion model in nonlinear optimization And the establishment of the cost function and the solution method of the optimal solution. Said method comprises the following steps:

[0025] S1. Calibration plate design and establishment of projection transformation based on TPP coordinate system.

[0026] S1.1. According to the requirements, design a calibration plate...

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Abstract

The invention provides a light field camera calibration method based on a self-matching polar triangle, and aims to establish a light field camera calibration device and method based on the self-matching polar triangle in order to overcome the defects that the existing light field camera calibration is limited too much and the precision is not high. Designing a calibration plate with parameter distinction and self-matching polar triangle characteristics; the calibration plate is rotated or the light field camera is moved to shoot the calibration plate under different postures; and determininghomography mapping of world points and image points, carrying out linear initialization by utilizing characteristics of a self-matching polar triangle and an absolute quadratic curve to calculate internal parameters of the light field camera and external parameters under corresponding postures, finally establishing a distortion model and a cost function, and carrying out iteration to obtain an optimal solution. According to the method, the internal parameters and the external parameters of the light field camera can be solved more flexibly and accurately.

Description

technical field [0001] The invention relates to the fields of computer vision, computer photography and optical engineering, in particular to a camera calibration model and method. Background technique [0002] The rise of light field imaging theory is an important innovation in the field of computer photography, which breaks through the limitations of traditional imaging techniques. Light field cameras reduce the loss of shooting information by recording the position and angle information of light in space, and are widely used in depth estimation, refocusing, 3D reconstruction and other fields. The processing of light field information in the later application is based on the calibration of camera parameters. Accurate calibration results are of great significance to the improvement of image resolution and imaging quality in the later stage. [0003] There are currently three common calibration plate modes, namely point, line, and quadratic curve. Existing methods usually ...

Claims

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Application Information

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IPC IPC(8): G06T7/80
Inventor 周果清张琦冯莹王庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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