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Calibration method and system for external parameters of double-station camera

A technology of external parameters and calibration methods, used in computer parts, image data processing, instruments, etc., can solve the problems of decreased calibration accuracy, high quality requirements of calibration objects, and high dependence on calibration accuracy, so as to reduce the number and improve the search Efficiency, the effect of speeding up the calibration process

Pending Publication Date: 2020-09-22
SHANGHAI UNIV +1
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Problems solved by technology

In addition to the high quality requirements for calibration objects, the layout of calibration objects is not feasible in some complex scenarios
Compared with the traditional calibration method, the self-calibration method has the advantage of being simple, convenient and fast, but its calibration accuracy is highly dependent on whether the current field of view has high-quality features. For the field of view without obvious features, the calibration accuracy will appear. A greater degree of decline

Method used

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  • Calibration method and system for external parameters of double-station camera
  • Calibration method and system for external parameters of double-station camera
  • Calibration method and system for external parameters of double-station camera

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Embodiment Construction

[0052] The purpose of the present invention is to provide a method and system for calibrating the external parameters of a dual-station camera, so as to reduce the difficulty of calibrating and improve the quality of calibrating.

[0053] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] Specifically, such as figure 1Shown, a kind of calibration method of the external parameter of dual-station camera, the calibration method of external parameter of the present invention is implemented under the condition that the internal parameter of dual-station camera is known, and described calibration method comprises the following steps:

[0055] In step 101, the target scene is captured by the left station camera and the right station camera respectively to obtain a first left image an...

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Abstract

The invention discloses a calibration method and system for external parameters of a double-station camera. According to the calibration method, an original basic matrix is calculated by extracting existing feature points in a picture in advance, an auxiliary calibration object is added for a region with sparse or missing features in an original picture, the original basic matrix can be used for quickly matching auxiliary calibration objects in left and right station camera pictures through an epipolar constraint, the searching efficiency is improved, the calibration process is accelerated, the requirement for the calibration object in the process is low, the calibration object only need to have obvious characteristics, and no special requirement is needed for the sizes and shapes of the calibration object. According to the calibration method provided by the invention, the reliability of camera calibration is improved on the basis of reducing the difficulty of camera calibration.

Description

technical field [0001] The invention relates to the field of parameter calibration of a dual-station camera, in particular to a calibration method and system for external parameters of a dual-station camera. Background technique [0002] In the optical measurement system carried out by means of digital image correlation technology (Digital Image Correlation, DIC) under the current conditions, the method of calibrating the internal and external parameters of the camera is mainly divided into the traditional method of using the calibration object and the self-calibration of matching the existing feature points of the image method. However, these two methods have their defects. The traditional calibration method requires point clouds with known relative positions during the calibration process, and has high requirements for the accuracy of the calibration object. In addition to the high quality requirements for calibration objects, the layout of calibration objects in some com...

Claims

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Application Information

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IPC IPC(8): G06T7/80G06K9/62G06K9/46
CPCG06T7/80G06V10/757G06V10/462
Inventor 张东升苏志龙王宗盛邹宇
Owner SHANGHAI UNIV
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