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Method for evaluating tangential distortion indexes of lens of camera

A tangential distortion and camera technology, which is applied in the field of cameras, can solve problems such as the difficulty of tangential distortion identification, and achieve reliable and stable evaluation results, good robustness, and easy engineering calculation and implementation

Active Publication Date: 2010-03-31
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the problem of difficult identification of tangential distortion in the prior art, the purpose of the present invention is to propose a method for evaluating the tangential distortion index of the camera lens

Method used

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  • Method for evaluating tangential distortion indexes of lens of camera
  • Method for evaluating tangential distortion indexes of lens of camera
  • Method for evaluating tangential distortion indexes of lens of camera

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Embodiment

[0042] figure 1 The distance d from the image edge to the center in (a)-(d) is 23.92, 126.82, 14.15 and 21.85 pixels, respectively. The maximum evaluation function I calculated from images 1(a) to (d) 2D The values ​​are: 0.0016, 0.98, 0.0049, 1.75, and the threshold ε is 0.3% of d. For image 1(a), 0.00160.3%×126.82=0.38, so the distortion is more obvious; for image 1(c), 0.00490.3%×21.85=0.06555, so there is a lot of distortion, figure 1 Shown are images captured by a catadioptric lens camera and images captured by an FC-E8 fisheye lens camera, where the ceiling is used as a template and the intersection of parallel lines on the ceiling is used as a feature point, figure 1 (a) shows a calibrated catadioptric camera, figure 1 (b) shows a slight translation of the mirror surface, figure 1 (c) shows the calibrated fisheye camera, figure 1 (d) shows that the mirror surface is tilted.

[0043] According to the method of the present invention, extract the image points on the...

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Abstract

The invention provides a method for evaluating tangential distortion indexes of a lens of a camera. The method comprises the following steps: acquiring an image filmed by the lens of the camera, wherein a template exists in a filmed scene; extracting image points on the template in the image; determining that the points on the template correspond with points of the image; calculating evaluation indexes by a formula by using coordinates of the points on the template and coordinates of corresponding points on the image; and evaluating the lens according to index values. The method can comprehensively evaluate the tangential distortion of the lens of the camera, and can provide guidance standards for calibration of an omnidirectional camera. The method is independent of the radial distortion,has the characteristics of convenience, practicality, high precision of evaluation standards, good robustness and the like, and ensures that the quality control detecting method for producing wide-angle lenses tends towards practicality and convenience.

Description

technical field [0001] The invention belongs to the technical field of cameras, in particular to a method for evaluating camera lenses. Background technique [0002] Many camera lenses produce distortion, especially wide-angle lenses. Wide-angle lens cameras include catadioptric, fisheye, and other cameras. It has a unique wide field of view, compared with traditional standard lens cameras, it has incomparable advantages in the fields of visual monitoring, visual tracking, reconstruction and roaming of large-scale scenes, machine navigation, etc., and can make up for the narrow field of view of standard lenses Defects. However, a big disadvantage of the wide-angle lens is that there is very serious deformation in the captured image, which brings great difficulties to us to monitor and track directly with the video device of the wide-angle lens. Therefore, it is very important to select a suitable wide-angle lens and estimate and evaluate the distortion of the wide-angle l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B27/00H04N17/00G03B43/00
Inventor 吴毅红胡占义戴志军
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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