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Camera calibration board and use method thereof, and feature point extraction method for camera calibration

A camera calibration and calibration board technology, applied in image analysis, image enhancement, instruments, etc., can solve the problems of mutual confusion, incomplete extraction, and poor matching between feature point image coordinates and spatial coordinates, and achieves the effect of improving accuracy.

Active Publication Date: 2021-09-17
湖南泽塔科技有限公司
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Problems solved by technology

[0004] The embodiment of the present application provides a camera calibration board and its use method, and a feature point extraction method for camera calibration, which solves the problem of incomplete extraction of feature points from the calibration board in the camera calibration method in the prior art, which leads to the matching degree of image coordinates and spatial coordinates of feature points. Not high, the problem of mutual confusion, thus improving the accuracy of camera calibration

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  • Camera calibration board and use method thereof, and feature point extraction method for camera calibration
  • Camera calibration board and use method thereof, and feature point extraction method for camera calibration
  • Camera calibration board and use method thereof, and feature point extraction method for camera calibration

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[0023] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the steps shown in the flowcharts of the accompanying drawings may be performed in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

[0025] In related technologies, the focal length of the camera may change continuously and unknown. At this time, when there is only pixel information, there is no good method to determine the five internal parameters of the camera based on a single ordinary camera, a single photo and a three-dimensional calibration template. Camera calibration is perfo...

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Abstract

The invention discloses a camera calibration board, a use method thereof and a feature point extraction method for camera calibration. The camera calibration board comprises a main calibration board and an auxiliary calibration board. Patterns drawn on the main calibration board comprise at least one concentric circular ring pattern and at least one pair of rectangular patterns. The pattern drawn on the auxiliary calibration board comprises at least one concentric circular ring pattern; the three calibration boards cannot be coplanar, world coordinates of the feature points on the main calibration board need to be determined, and only geometric measurement between the feature points on the auxiliary calibration board needs to be determined so that the auxiliary calibration board can be moved in the shooting process. According to the calibration mode, the sub-pixel coordinates of the spatial feature points can be obtained only by taking one picture. According to the invention, the problems of low matching degree and mutual confusion of the image coordinates and the space coordinates of the feature points caused by incomplete extraction of the feature points of the calibration plate in the camera calibration method in the prior art are solved, so that the camera calibration precision is improved.

Description

technical field [0001] This application relates to the technical field of camera calibration, in particular, to a camera calibration board and its usage method, and a feature point extraction method for camera calibration. Background technique [0002] In computer vision, 3D reconstruction from 2D images requires camera calibration to extract 3D structural information from 2D images. The purpose of camera calibration is to determine the internal and external parameters of the camera and the distortion coefficient, thus laying the foundation for computer vision. [0003] According to the dimensions of the calibration objects used, the calibration methods can be roughly divided into three-dimensional calibration object-based camera calibration, two-dimensional calibration object-based camera calibration, one-dimensional calibration object-based camera calibration and camera self-calibration methods. The accuracy of the camera self-calibration method is not high, and the appli...

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Application Information

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IPC IPC(8): G06T7/80G06T7/90G06T7/62G06T7/13G06T5/00
CPCG06T7/80G06T7/90G06T7/62G06T7/13G06T2207/30208G06T2207/30244G06T5/80
Inventor 韩梦思何军
Owner 湖南泽塔科技有限公司
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