Circular array calibration board feature point extraction method

A feature point extraction and calibration board technology, applied in image data processing, instruments, calculations, etc., can solve problems such as mutual confusion, poor matching of image coordinates and spatial point coordinates, affecting calibration results, etc. Good repeatability, precision and matching results

Active Publication Date: 2017-10-20
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0002] The way of camera calibration is to solve the model parameters of the camera from the image coordinates and world coordinates of the known feature points according to the camera model. The accuracy of feature point extraction directly determines the calibration result. Many existing algorithms have high accuracy of feature point extraction. The matching degree between the image coordinates and the spatial point coordinates is not high, and sometimes there will be confusion with each other, and the direct calculation will greatly affect the calibration results.

Method used

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  • Circular array calibration board feature point extraction method
  • Circular array calibration board feature point extraction method
  • Circular array calibration board feature point extraction method

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Embodiment 1

[0031] Embodiment 1: as Figure 1-3 As shown, a method for extracting feature points of a circular array calibration plate includes the following steps:

[0032] Step1. Design and manufacture a circular array (6×8) calibration board;

[0033] Step2. Place the calibration board within the field of view of the CCD camera that needs to be calibrated to collect the image of the circular array calibration board;

[0034] Step3. Binarize the collected image by adjusting the threshold slider to a suitable position;

[0035] Step4, use the findContours function in OpenCV to extract all the contours in the image;

[0036] Step5. For each ellipse outline, directly use the least squares fitting algorithm to fit the ellipse, solve its center coordinates, major axis length and minor axis length, and save them in the set variables;

[0037] Step6. According to the relatively small distortion of the CCD camera, the ratio of the major axis to the minor axis of the ellipse in the collected ...

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Abstract

The invention relates to a circular array calibration board feature point extraction method, which belongs to the technical field of camera calibration. In view of a camera calibration way in which model parameters of the camera are solved by image coordinates and world coordinates of a known feature point according to the camera model, the analyzed feature point extraction precision directly decides a calibration result, a new ellipse center feature extraction algorithm is provided, the method has relatively high precision, the problem of matching between image coordinates and space point coordinates of a feature point obtained by the existing feature extraction algorithm can be well solved, and fully-automatic extraction of the ellipse center is realized.

Description

technical field [0001] The invention relates to a method for extracting feature points of a circular array calibration plate, belonging to the technical field of camera calibration. Background technique [0002] The way of camera calibration is to solve the model parameters of the camera from the image coordinates and world coordinates of the known feature points according to the camera model. The accuracy of feature point extraction directly determines the calibration result. Many existing algorithms have high accuracy of feature point extraction. The matching degree between the image coordinates and the spatial point coordinates is not high, and sometimes they are confused with each other, which directly takes the calculation and greatly affects the calibration results. Contents of the invention [0003] The technical problem to be solved in the present invention is to provide a method for extracting feature points of a circular array calibration plate. At first, the app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 李文国杨其乐陈田
Owner KUNMING UNIV OF SCI & TECH
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