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Geometric dimension precision measurement method based on telecentricity compensation

A geometric size and precision measurement technology, applied in image data processing, instruments, calculations, etc., can solve problems such as low measurement accuracy and measurement errors, and achieve the effect of solving low measurement accuracy, improving accuracy, and reducing fluctuations

Pending Publication Date: 2021-06-08
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a precise geometric dimension measurement method based on telecentricity compensation, aiming to solve the technical problem that the measurement error caused by the telecentricity of the telecentric optical system in the prior art leads to low measurement accuracy

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  • Geometric dimension precision measurement method based on telecentricity compensation
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  • Geometric dimension precision measurement method based on telecentricity compensation

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Embodiment Construction

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0041] In describing the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element...

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Abstract

The invention discloses a geometric dimension precision measurement method based on telecentricity compensation. The method comprises the following steps of: shooting a calibration plate image sequence, selecting a calibration plate image position with the highest definition to be set as a central plane, and establishing a compensation model based on a distortion model of a lens. Telecentricity measurement errors deviating from the central plane distance is compensated in the whole field depth range, the fluctuation degree of the system magnification along with the change of the imaging distance is weakened, the precision of the measurement system is further improved, and the method solves the technical problem of low measurement precision caused by measurement errors caused by telecentricity of a telecentric optical system in the prior art.

Description

technical field [0001] The invention relates to the technical field of image measurement, in particular to a precise geometric dimension measurement method based on telecentricity compensation. Background technique [0002] As one of the key technologies of machine vision, optical imaging directly obtains the surface information of the measured part, which has a great influence on the measurement accuracy of geometric dimensions. Although a large field of view can be obtained in a non-telecentric traditional optical system, its inherent shortcomings such as small depth of field and large distortion, the clarity and magnification of the image are easily affected by the change of the imaging distance, making it difficult to apply For high-precision measurement of geometric dimensions of complex parts, such as crankshafts with different imaging distances on the measured surface. [0003] Compared with non-telecentric optical systems, telecentric optical systems designed with p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T7/80G06T2207/10016
Inventor 李文杰王海旺王辉高兴宇王海舰李团兴张宗辉
Owner GUILIN UNIV OF ELECTRONIC TECH
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