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Target method for quickly calibrating intrinsic parameters of vidicon

A technology of camera internal parameters and targets, used in image data processing, image analysis, instruments, etc.

Inactive Publication Date: 2014-07-02
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to aim at fast and convenient calibration of camera internal parameters in a large field of view and complex measurement environment, and a target method for rapid calibration of internal parameters using equilateral triangles and their inscribed circles is invented

Method used

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  • Target method for quickly calibrating intrinsic parameters of vidicon
  • Target method for quickly calibrating intrinsic parameters of vidicon
  • Target method for quickly calibrating intrinsic parameters of vidicon

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Embodiment 1

[0044] Embodiment 1, the present invention uses two cameras respectively equipped with wide-angle lenses to capture a target image. The camera model is FASTCAM SAX camera, resolution: 1024×1024, CCD area: 2cm×2cm, weight: 12.6kg. The wide-angle lens model is AF-S17-35mm f / 2.8D IF-ED parameters are as follows, lens focal length: f=17-35, APS focal length: 25.5-52.5, maximum aperture: F2.8, minimum aperture: F22, lens weight : 745g, lens size: 82.5×106. The shooting conditions are as follows: the pixel of the picture is 1024×1024, the focal length of the lens is 17mm, the object distance is 750mm, and the field of view is about 800mm×800mm.

[0045] The first step is to establish a homography matrix equation based on the coordinates of the center of the inscribed circle

[0046] 1) Extract the center of the inscribed circle

[0047] Take a target image. In this example, the Sobel edge detection operator is used to extract the edge of the inscribed circle according to the form...

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Abstract

The invention discloses a target method for quickly calibrating intrinsic parameters of a vidicon and belongs to the field of computer vision measurement. The target method comprises the steps of quickly calibrating intrinsic parameters of the vidicon by means of a target in a shape of regular triangles with inscribed circles; extracting image coordinates of centers of the inscribed circles, and establishing a homography matrix equation according to homography of a target plane and an image plane; extracting shape information of the regular triangles and the inscribed circles, calculating image coordinates of vertexes and points of tangency of the regular triangles to obtain a regular triangle vertical line equation, acquiring end points of parallel lines according to orthogonal parallel segments formed by corresponding sides and vertical lines of the four regular triangles, and establishing an end point equation; performing solving on intrinsic parameters of the vidicon. By means of the target method, the calibration process is simple and convenient, a matrix of intrinsic parameters of the vidicon can be obtained only by shooting a target image, the calibration speed is high, and quick calibration in large visual fields and under complex environments can be achieved.

Description

technical field [0001] The invention belongs to the technical field of computer vision measurement, and relates to a target method for quickly calibrating internal parameters of a camera. Background technique [0002] The calibration of camera internal parameters plays a very important role in the field of computer vision measurement, and its calibration speed and accuracy directly determine the speed and accuracy of measurement. With the development of digital measurement of large aircraft in my country, the application of computer vision measurement technology is becoming more and more extensive, and the corresponding calibration methods need to meet more stringent requirements. Aiming at practical measurement problems such as large measurement field of view, short reserved measurement time, and relatively complex measurement environment in the visual measurement of large aircraft components, how to realize the fast and convenient internal parameter calibration method for ...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 刘巍张洋贾振元马鑫尚志亮李晓东李肖
Owner DALIAN UNIV OF TECH
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