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Mutative scale-based high-precision optical three-dimensional measurement method

A three-dimensional measurement, high-precision technology, applied in measurement devices, optical devices, instruments, etc., can solve the problems of complex splicing, slow splicing of multiple pieces, sparse point clouds, etc., to achieve a simple system calibration process, and the freedom of scanning methods. Good, dense point cloud effect

Inactive Publication Date: 2016-05-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0007] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a high-precision optical three-dimensional measurement method based on variable scale to solve the problem of sparse local point cloud and low precision after scanning by the fixed-scale scanning method in the prior art , the present invention well avoids the disadvantages of inability to scan and reconstruct local details under a large field of view, overall scanning under a small field of view, slow splicing of multiple pieces, and complicated splicing in the existing methods

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[0033] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

[0034] The variable scale-based high-precision optical three-dimensional measurement method of the present invention includes the following steps:

[0035] Step 1: Build a binocular vision measurement system, select a focal length lens with a large field of view, and perform system calibration on the binocular vision measurement system;

[0036] refer to figure 1 As shown, the binocular vision measurement system mainly includes: object to be measured 1, first camera lens 2, first CCD camera 3, projector 4, second camera lens 5, second CCD camera 6, computer image processing Control system 7, the computer image processing control system 7 includes: an image processing system and a zoom contr...

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Abstract

The invention discloses a mutative scale-based high-precision optical three-dimensional measurement method. According to the method of the invention, a binocular vision measurement system is firstly built; through switching focal lengths under different visual field scales, two times or more times of scanning under different scales can be carried out in an area with enough overlapped feature points; point cloud data under a large visual field serve as the basis, after local point cloud data are acquired through scanning in a small visual field, splicing of data of two point clouds is carried out, and thus, three-dimensional point cloud rebuilding on the overall object including local detailed parts can be completed. Compared with the scanning method under other single scale, the method of the invention has the advantages that the scanning precision is higher; after the visual field scale is changed, a system calibration process is simple, no special calibration object is needed, the calibration result precision is high, and the matching and splicing result is stable and reliable in a condition with enough sharing feature points, and the method can be widely applied to a visual measurement occasion with high precision requirements.

Description

technical field [0001] The invention belongs to the field of computer vision measurement, and specifically refers to a high-precision optical three-dimensional measurement method based on variable scale. Background technique [0002] The three-dimensional scanning of objects belongs to reverse engineering, which is the premise and basis of product quality inspection, artificial intelligence, virtual reality and other technologies. With the development of science and technology and the continuous expansion of market demand, the optical-based non-contact three-dimensional object shape measurement technology has been greatly developed, and this technology has been widely used in various fields, such as digital preservation of culture and art, and medical research. Reconstruction of the mandible and scan reconstruction of prosthetics. In reverse engineering, digital measurement is carried out on the physical model or parts to be measured and CAD models are established on this b...

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/25
Inventor 崔海华戴宁范敬利程筱胜张益华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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