Robust lens distortion correction method

A lens distortion and correction method technology, applied in the field of lens distortion correction and robust lens distortion correction, can solve the problems of difficult to solve the distortion coefficient, camera lens distortion, low practicability, etc. Model complex effects

Inactive Publication Date: 2018-11-23
NANJING HUICHUAN IND VISUAL TECH DEV +1
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  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is: the camera lens generally has distortion, and the coupling between the internal and external parameters and the lens distortion in the traditional camera calibration method makes it difficult to solve the distortion coefficient. Big, low-practicability problem

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Embodiment Construction

[0058] In order to solve the problem of coupling between internal and external parameters and lens distortion in the traditional camera calibration method, the present invention proposes a robust lens distortion correction method, the main process of which can be found in figure 1 , the solution of the present invention is illustrated below through specific examples.

[0059] 1) First, use the checkerboard as the calibration object, attach the pre-printed calibration paper on a flat surface, and take pictures with a camera that needs distortion correction to ensure that the calibration checkerboard fills the field of view as much as possible. The pictures taken by the camera are as follows: figure 2 As shown in , the checkerboard corner points with sub-pixel level accuracy are extracted as the basis for correction;

[0060] The checkerboard is a widely used calibration object in the classical camera calibration method. The collinear and coplanar features of the corner points ...

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Abstract

The invention discloses a robust lens distortion correction method. The invention provides a method for separating lens distortion from camera parameters to be solved separately. The method comprisesthe following steps of: performing a feature extraction from a checkerboard calibration object by firstly performing angular point detection utilizing a Shi-Tomasi operator, then performing screeningaccording to the specific characteristics of symmetry and large variance of the checkerboard angular point, and finally obtaining an sub-pixel coordinate with accurate checkerboard angular point by utilizing a sub-pixel optimization algorithm; establishing a camera imaging model and a lens distortion model to obtain an optimized objective function with respect to a distortion parameter; and solving the distortion parameter by utilizing a nonlinear optimization algorithm for distortion correction. According to the robust lens distortion correction method, a calculation of all main distortion parameters can be accomplished with only one calibration object image containing the checkerboard, the model is simple, the calculation efficiency and stability are high, the application adaptability isgood in an industrial field, and the calculation accuracy is comparable to a traditional method.

Description

technical field [0001] The invention belongs to the technical field of machine vision and digital image processing, relates to lens distortion correction, and is a robust lens distortion correction method. Background technique [0002] The main task of camera calibration is to determine the camera's position, attitude and other attribute parameters to establish the correspondence between any point in space and its image point on the image plane after being imaged by the camera. The position of the image point on the image plane is directly related to the spatial geometric position of the corresponding object point, and is determined by the geometric model of the camera imaging. Through the camera parameters obtained through calibration, the geometric information of objects in three-dimensional space can be calculated. In the field of computer vision, domestic and foreign scholars have conducted in-depth research on camera calibration technology in the past two decades, and ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/80
CPCG06T5/006G06T7/80
Inventor 李勃王杰董蓉周子卿赵鹏张绳富梁振华黄璜史德飞查俊
Owner NANJING HUICHUAN IND VISUAL TECH DEV
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