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Zoom camera calibration method

A zoom camera and calibration method technology, which is applied in the field of camera calibration in machine vision, can solve the problems of large range of shooting distance and difficult to use

Pending Publication Date: 2020-11-10
SHENYANG AIRCRAFT CORP
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Due to the characteristics of the field of view and the wide range of shooting distances in the actual use of zoom cameras, many calibration methods in fixed-focus cameras are difficult to use in the calibration of zoom cameras

Method used

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Embodiment Construction

[0074] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0075] The present invention adopts the scheme of camera principal point position and focal length separation calibration. Firstly, the principal point position of the camera is calibrated, and then based on this, the focal length of the zoom camera is calibrated at different camera lens group positions.

[0076] Calibration of the principal point position of the zoom camera:

[0077] 1. The calibration steps of the principal point position of the zoom camera are as follows:

[0078] 1) Fix the position of the camera, only adjust the focal length of the camera, and always keep the camera focused to infinity, and shoot several calibration images.

[0079] 2) Use the Sift feature extraction algorithm to perform feature point extraction and preliminary matching on each image.

[0080] 3) Accurate matches are obtained using a random sampling con...

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Abstract

The invention discloses a zoom camera calibration method, and belongs to the field of camera calibration in machine vision. According to the invention, modeling is carried out on the imaging process and related parameters of the zoom camera, and the constraint condition that the position of the main point of the camera is not changed in the zoom process is provided. Based on the constraint condition, a calibration method based on a zoom image sequence is provided to obtain the accurate position of the main point of the camera. Aiming at a zoom camera focal length calibration problem, a self-calibration method containing additional constraint conditions is provided. Simulation test and actual calibration test results show that the method provided by the invention has high precision and canbe used in actual calibration tasks.

Description

technical field [0001] The invention belongs to the field of camera calibration in machine vision and relates to a zoom camera calibration method. Background technique [0002] In aerospace and other fields, the research and development of new models and systems needs to measure the three-dimensional attitude of air targets to obtain index parameters such as roll angle, pitch angle, yaw angle, and flight distance. These parameters are of great significance for analyzing and evaluating the motion characteristics of the aircraft and further improving the system performance. In general, the three-dimensional attitude of the aircraft can be obtained through an inertial measurement platform composed of high-precision gyroscopes, accelerometers, etc., or GPS and other devices. However, in some cases, these instruments cannot be installed on the object to be measured, or may fail. At this time, a feasible method is to use high-speed cameras and other equipment to track and shoot t...

Claims

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Application Information

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IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 孙忠海王小凌耿莽河
Owner SHENYANG AIRCRAFT CORP
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