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Telecentric optical path distortion center positioning method

A technology of central positioning and telecentric optical path, applied in the field of optical measurement, can solve problems such as neglect

Active Publication Date: 2020-11-06
南京理工大学智能计算成像研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the optical distortion of the lens, the position of the distortion center is very important, but most of the current research ignores or assumes a distortion center

Method used

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  • Telecentric optical path distortion center positioning method
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Embodiment Construction

[0031] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

[0032] like figure 1 As shown, the method for locating the distortion center of the telecentric optical path in this embodiment has two steps.

[0033] Step 1: Radial distortion center positioning.

[0034] Lens distortion is composed of radial distortion and tangential distortion, and the main distortion is generally the radial distortion part. First ignore the small tangential distortion in the distortion amount, and only use the radial distortion as the distortion center e(u 0 ,v 0 ) Basis and reference for positioning. a distorted point p d (u d ,v d ) and its ideal und...

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Abstract

The invention provides a telecentric optical path distortion center positioning method. The method comprises the following steps of: 1, positioning a radial distortion center, namely ignoring smallertangential distortion in distortion quantity, and only taking the radial distortion as a basis and a reference for positioning the distortion center; and 2, carrying out iterative optimization based on a feature image plane is carried out, wherein the optimization is based on the spatial distribution of the calibration pattern, and the optimal distortion center coordinate and the corresponding distortion coefficient are positioned, so that the extracted feature points meet the spatial distribution of the calibration pattern again after distortion compensation. According to the method providedby the invention, positioning of the distortion center is independent from the global iterative optimization of camera optical path calibration through a two-step positioning algorithm, a reliable distortion coefficient initial value is directly calculated, and a more accurate and rapid convergence calibration algorithm can be established based on the reliable distortion parameter initial value.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and in particular relates to a method for locating the distortion center of a telecentric optical path. Background technique [0002] In recent years, due to the rapid development of precision manufacturing technology, there are more and more miniaturized designs and processes in the field of industrial manufacturing. For a large number of microstructures, corresponding three-dimensional measurement technology is required to ensure their accurate manufacturing and optimal design. Binocular measurement technology is a classic three-dimensional measurement method, which plays a key role in the acquisition of various three-dimensional information based on the principle of triangulation. However, because the physical feature points in the image information of the object itself are generally difficult to distinguish and accurately extract, the binocular measurement method based on image in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/73
CPCG06T7/75
Inventor 左超张晓磊沈德同
Owner 南京理工大学智能计算成像研究院有限公司