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A Distortion Correction Algorithm for the Optical System of a Full View 3D Measuring Instrument

A technology of distortion correction and three-dimensional measurement, which is applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of reducing geometric position accuracy and measurement error, and achieve the effect of reducing optical system distortion and improving angle measurement accuracy

Active Publication Date: 2020-03-13
HARBIN INST OF TECH
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Problems solved by technology

[0003] In order to solve the problem that the geometric position accuracy of the object in the image is reduced due to lens distortion, thereby generating measurement errors, the present invention provides a distortion correction algorithm for the optical system of a full-view 3D measuring instrument, which can effectively reduce the Stereo measurement errors caused by image distortion caused by lens manufacturing and assembly errors greatly improve the angle measurement accuracy of the system

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  • A Distortion Correction Algorithm for the Optical System of a Full View 3D Measuring Instrument
  • A Distortion Correction Algorithm for the Optical System of a Full View 3D Measuring Instrument
  • A Distortion Correction Algorithm for the Optical System of a Full View 3D Measuring Instrument

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specific Embodiment approach 1

[0020] Specific implementation mode one: as figure 1 As shown, the distortion correction algorithm for the optical system of a full-view 3D measuring instrument provided by this embodiment is composed of two parts: the establishment of the distortion relationship and the correction of the distorted image, wherein:

[0021] The establishment of the distortion relationship is to construct the mapping relationship between the standard image and the coordinates of the distorted image. Such as figure 2 As shown, the specific steps are as follows:

[0022] 1) According to the camera parameters provided by the user and the actual target, the standard image coordinates of the control points are calculated using the ideal imaging projection relationship;

[0023] 2) Obtain the coordinates of the control points in the distorted image coordinate system according to the actual distorted target image;

[0024] 3) If the distortion relationship is described using the function expression...

specific Embodiment approach 2

[0031] Specific implementation mode two: as Figure 4 As shown, this embodiment provides a visible light optical system for a full-view three-dimensional measuring instrument. The visible light optical system is composed of a low-distortion wide-angle imaging optical lens 1 and a linear array CMOS camera 2. The linear array CMOS camera 2 and the low-distortion wide-angle The imaging optical lens 1 is fixed together, and the low-distortion wide-angle imaging optical lens 1 clearly images the collected visible light image on the focal plane of the line array CMOS camera 2 .

[0032] Such as Figure 5 As shown, the low-distortion wide-angle imaging optical lens 1 adopts the F-Theta lens structure, so that the spatial angular resolution is directly proportional to the number and size of the camera. Low-distortion wide-angle imaging optical lens 1 has a focal length of 26.07, which is more than three times the focal length of ordinary wide-angle imaging objective lenses. The work...

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Abstract

The invention discloses a distortion correction algorithm for an optical system of an all-view 3D measuring instrument. The algorithm comprises the steps as follows: 1, establishment of a distortion relation: constructing a mapping relation between coordinates of a standard image and coordinates of a distortion image and generating a distortion correction coefficient file or a distortion correction form file; 2, correction of the distortion image: correcting the input distortion image by using the generated distortion correction coefficient file or a distortion correction form file to obtain a corrected standard image finally. With the adoption of the algorithm, stereo measurement errors caused by image distortion because of optical lens manufacturing and adjustment errors can be effectively reduced, the angle measuring accuracy of the system is greatly improved, and the problem that measurement errors are produced due to the fact that lens distortion reduces geometric position accuracy of objects in images is solved.

Description

technical field [0001] The invention belongs to the technical field of optical imaging, and relates to a distortion correction algorithm for the optical system of a full-view three-dimensional measuring instrument. Background technique [0002] The fully automatic image measuring instrument can perform three-dimensional coordinate measurement conveniently and quickly, meeting the requirements of higher speed, more convenient and more accurate measurement for size detection proposed by the modern manufacturing industry. It is a bottleneck technology to solve the development of the manufacturing industry. The full-view high-precision three-dimensional measuring instrument is a precision angle measurement and positioning system with a large field of view, high resolution, and a large working distance range. Its angle measurement accuracy requires second-level accuracy. Since the full-view 3D measuring instrument adopts the F-Theta system and the 90° large field of view wide-ang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G01B11/00
CPCG01B11/002G06T5/006
Inventor 康为民张建隆贺磊
Owner HARBIN INST OF TECH
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