Camera calibration board, calibration method and camera

A camera calibration and camera technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as poor robustness, inability to adapt to shortcomings or noise, achieve flexible placement, and improve robustness and accuracy Effect

Pending Publication Date: 2019-05-31
昂视智能(深圳)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the positioning reference is on the frame, and the calibration board needs to be completely within the field of view; and the corresponding algorithm requires that the marker points need to be detected exactly, which cannot adapt to the situation of shortcomings or noise points, and the robustness is not good

Method used

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  • Camera calibration board, calibration method and camera
  • Camera calibration board, calibration method and camera
  • Camera calibration board, calibration method and camera

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Embodiment

[0043] Such as image 3 As shown, the camera calibration plate provided in this embodiment includes a plurality of dots, where the dots are solid dots, that is, the dots are filled with color, for example, the dots are filled with black. The dots are divided into datum dots and reference dots; as an option, the datum dots in this embodiment are larger than the reference dots, that is, the diameter of the datum dots is larger than the diameter of the reference dots. The reference dots and reference dots are arranged in a checkerboard shape, all rows are parallel, all columns are parallel, all rows and all columns are perpendicular to each other; the distance between adjacent dots in each row is equal, and the distance between adjacent dots in each column is equal. The dots are equally spaced, and the distance between adjacent dots in each row is equal to the distance between adjacent dots in each column. The distance between adjacent rows mentioned here refers to the distance ...

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Abstract

The invention relates to a camera calibration board, a calibration method and a camera. According to the invention, circular mark points with different sizes are adopted, and detection is carried outby taking a reference dot as a reference. The calibration method comprises the following steps: carrying out edge extraction on a calibration plate image collected by a camera to obtain an edge contour of each dot; Performing ellipse fitting on the edge contour of each dot to obtain a fitting ellipse corresponding to each dot; Positioning a reference ellipse according to the size and position relationship between the fitted ellipses; Taking the reference ellipse as a seed point, finishing the sorting of all mark points, and obtaining image coordinates and world coordinates which are in one-to-one correspondence; And completing calibration calculation of camera parameters by using the image coordinates and the world coordinates. In the calibration process, the calibration plate is placed flexibly, the calibration of the camera can be completed only by ensuring that the reference round points are located in the visual field and providing the point spacing and without providing the row and column number of the mark points of the calibration plate, and the robustness and the precision of calibration are effectively improved.

Description

technical field [0001] The invention relates to the field of camera calibration, more specifically, to a camera calibration board, a calibration method and a camera. Background technique [0002] In machine vision applications, the calibration of camera parameters is a crucial link, especially in vision measurement applications, where the calibration accuracy directly affects the accuracy of the entire measurement system. Camera calibration requires a calibration plate with a special structure to extract precise point-line features. At present, there are mainly two types of calibration boards in the prior art: checkerboard calibration boards and dot-shaped calibration boards. Among them, the checkerboard calibration board obtains point features by locating the corner points of the checkerboard. In order to ensure the extraction accuracy of the corner points, higher imaging quality is usually required. The dot-type calibration plate obtains point features by locating the ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
Inventor 陈辉邱文胜陈鹏宇
Owner 昂视智能(深圳)有限公司
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