Lens distortion parameter calibration method and system

A technology of parameter calibration and lens distortion, applied in the field of image processing, can solve the problems of high error rate, large amount of calculation, heavy workload of operators, etc., to improve the accuracy and efficiency of correction, and achieve the effect of image distortion correction

Active Publication Date: 2017-06-09
SHENZHEN ANGELL TECH
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Problems solved by technology

At present, distortion correction is mainly divided into two types: one is to manually select the reference point of distortion correction, such as the corner of a checkerboard, which is more accurate, but the workload of the operator is heavy; the other is automatic corner detection, sometimes It is also necessary to take multiple images of the calibration plate from different angles of view. This method has a high error rate and a large amount of calculation

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  • Lens distortion parameter calibration method and system
  • Lens distortion parameter calibration method and system
  • Lens distortion parameter calibration method and system

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Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0055] The invention uses the checkerboard calibration board to calibrate the lens distortion parameters, and then corrects the distortion of the distorted image. Such as figure 1 As shown, the process flow of the distorted image correction method of the present invention is as follows:

[0056] Step A: First, take the original image of the checkerboard calibration plate with the lens whose distortion parameters are to be calibrated, and perform binarization on the captured original image to obtain the original binary image. The original binary image as figure 2 As shown, its width and height are Width and Height respectively. The threshold value in the binarization process can be automatically calculated by using the mean value of the image gr...

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Abstract

The invention relates to the technical field of image processing, in particular to a lens distortion parameter calibration method and system. An original image of a checkerboard check calibration board, shot by a lens is subjected to binarization processing, an obtained binary image is subjected to horizontal edge detection, linear fitting and parabola fitting are respectively conducted on an obtained horizontal edge image and then feature analysis is conducted on various straight lines and parabolas obtained through fitting so as to determine a distortion parameter of the checkerboard check calibration board in the vertical direction and complete calibration of the distortion parameter of the lens. The calibration of the distortion parameter of the lens can be quickly and accurately by means of the lens distortion parameter calibration method and system and only by shooting one checkerboard check calibration board image, accordingly image distortion correction is achieved, and correction accuracy and efficiency can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a lens distortion parameter calibration method and system. Background technique [0002] Most image acquisition systems use lenses. Due to the convex physical structure of the lens itself, the captured images are more or less distorted. The distorted images do not conform to the observation habits of the human eye, so the distorted images need to be corrected. In order to accurately correct the distorted image, a dot matrix or checkerboard calibration plate is generally used. At present, distortion correction is mainly divided into two types: one is to manually select the reference point of distortion correction, such as the corner of a checkerboard, which is more accurate, but the workload of the operator is heavy; the other is automatic corner detection, sometimes It is also necessary to take multiple images of the calibration plate from different angles of view. This...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/80
Inventor 孙凯叶超李学军陈娴
Owner SHENZHEN ANGELL TECH
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