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Flexible-target-based close-range large-field-of-view calibrate method of high-speed camera

A calibration method and camera technology, applied in image data processing, instruments, calculations, etc., can solve the problems that cannot reflect the real distortion of the entire image, and the calibration object is not filled.

Active Publication Date: 2015-08-19
DALIAN UNIV OF TECH
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Problems solved by technology

Although this method takes into account the influence of imaging distortion when calibrating the camera, the calibration object used cannot fill the entire measurement field of view, so the imaging distortion of the calibrated camera cannot reflect the real distortion of the entire image

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  • Flexible-target-based close-range large-field-of-view calibrate method of high-speed camera

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Embodiment Construction

[0045] The following combined technical solutions and attached figure 1 and 2 Specific embodiments of the present invention will be described in detail. attached figure 1 Schematic diagram of camera calibration system for close-range large field of view measurement camera based on flexible target. Firstly, the inner and outer areas 6 and 3 of the flexible target are designed according to the measurement requirements so that they fill the entire measurement field of view. Among them, the inner area 6 of the flexible target is composed of a plane checkerboard grid 5, and the distance between the corner points 7 of the grid is known; the outer area 3 of the flexible target is a cross bar, on which a plurality of equidistant coding marking points are evenly distributed. During calibration, use the installed left and right high-speed cameras 1 and 2 to collect images of the target at different positions, and extract the center of the coded marker point 4 and the corner 7 of the ...

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Abstract

The invention, which belongs to the computer vision field, provides a flexible-target-based close-range large-field-of-view calibrate method of a high-speed camera and relates to a close-range large-field-of-view binocular-visual-sense camera calibration method in a wind tunnel. According to the method, a flexible target is used for fill an overall calibration view field for calibration; the internal region of the target is formed by a planar chessboard mesh and distances between angular points of the chessboard mesh are known; the external region of the target is formed by cross target rods perpendicular to each other and a plurality of coding marking points with known distances are distributed on the target rods uniformly. During calibration, regional and constraint calibration is carried out on a high-speed camera by using different constraint information provided by different regions of the target. When the internal region of the target is calibrated, calibration is carried out by using a homography matrix; and the external region is calibrated by using distance constraints of the coding marking points. According to the invention, the cost is lowered and the operation portability is realized. During calibration, distortion of different regions is considered by using the regional and constraint camera calibration method, so that the calibration precision is improved.

Description

technical field [0001] The invention belongs to the field of computer vision measurement, and relates to a camera calibration target and a corresponding calibration method in the close-range large field of view measurement of a wind tunnel environment target. Background technique [0002] In recent years, with the continuous development of aerospace technology, the national defense industry has put forward higher and higher precision indicators and technical requirements for aerospace strategic equipment. As an effective simulation method, wind tunnel simulation experiment technology provides Effective data support. Visual measurement technology is widely used in wind tunnel simulation experiments due to its advantages of non-contact, high precision, strong real-time performance and high adaptability. Camera calibration is the first and most critical step in visual measurement. The calibration accuracy of the camera directly affects the final visual measurement accuracy. L...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T7/85
Inventor 刘巍李肖陈玲马鑫刘惟肖
Owner DALIAN UNIV OF TECH
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