Automatic calibration method of infrared camera

Abstract

The invention discloses an automatic calibration method for an infrared camera. The automatic calibration method comprises the steps that (1) a calibration tool is fixedly installed at the tail end of a mechanical arm; (2) the tail end pose of the mechanical arm is adjusted, and a camera view plane at the current calibration tool position is obtained through calculation; (3) the motion trail of the mechanical arm is planned; (4) the mechanical arm is controlled to move, a view image of the calibration tool is collected at each track point through a camera, and the corresponding tail end pose of the mechanical arm is recorded; (5) the three-dimensional coordinates of the center point of the calibration tool corresponding to each track point are calculated; (6) circle center coordinates of each circle in the view image corresponding to each track point are extracted through a circle center extraction algorithm; and (7) calculation is performed to obtain camera parameters according to the steps (5) and (6) and the camera calibration function. The position of the calibration object relative to the camera can be kept consistent through advance planning, so that the calibration experiment can be reproduced, the consistency of the position of the calibration object is ensured, human factors are eliminated, and the extracted features are more stable.

Description

technical field [0001] The invention relates to the field of camera calibration, in particular to an automatic calibration method for an infrared camera. Background technique [0002] In the image measurement process and machine vision applications, in order to determine the relationship between the three-dimensional geometric position of a point on the surface of a space object and its corresponding point in the image, it is necessary to establish a geometric model of camera imaging. These geometric model parameters are camera parameters. The process of solving camera parameters is called camera calibration (or camera calibration). Whether it is in image measurement or machine vision applications, the calibration of camera parameters is a very critical link. The accuracy of the calibration results and the stability of the algorithm directly affect the accuracy of the camera work results. [0003] The traditional camera calibration method uses a flat calibration object with...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The present invention proposes a fast and automatic camera calibration method based on the robotic arm motion platform, aiming at the problems of excessive human factors in the calibration process, processing errors of the calibration plate, and projection compression during shooting in the prior art. Not only eliminates human factors, but also extracts features more stable and precise

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