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Sheet metal part rectangular contour three-dimensional measurement method and system based on feature fitting

A technology of three-dimensional measurement and sheet metal parts, which is applied in the field of three-dimensional measurement, can solve the problems that it is difficult to guarantee the reconstruction accuracy of the rectangular contour point cloud and the stability of data processing, and achieve the effect of ensuring the reconstruction accuracy

Pending Publication Date: 2022-07-12
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a three-dimensional measurement method and system for the rectangular contour of sheet metal parts based on feature fitting, thereby solving the problem that the existing three-dimensional measurement methods such as structured light are difficult to ensure the rectangular contour points Technical Issues of Cloud Reconstruction Accuracy and Data Processing Stability

Method used

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  • Sheet metal part rectangular contour three-dimensional measurement method and system based on feature fitting
  • Sheet metal part rectangular contour three-dimensional measurement method and system based on feature fitting
  • Sheet metal part rectangular contour three-dimensional measurement method and system based on feature fitting

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Embodiment

[0058] (1) If figure 2 As shown in the figure, turn on the light source to ensure that the surface of the sheet metal part has proper lighting, and then use the binocular camera to take pictures synchronously to obtain the image of the sheet metal part.

[0059] (2) Perform distortion correction and epipolar correction on the image, and then perform canny edge detection to obtain preliminary edges, perform contour extraction and identification, and obtain rectangular contours.

[0060] Specifically, as image 3 As shown, first, based on the ratio of the gray value inside and outside the contour, it is judged whether the requirements for the contour of the rectangular hole position are met, and if so, proceed to the next step; that is, find the closest polygon of the contour, and if the number of sides of the obtained polygon is 4, it is considered that This contour may be a parallelogram; continue to the next step, perform parallelogram judgment, and judge the parallelism of...

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Abstract

The invention discloses a sheet metal part rectangular contour three-dimensional measurement method and system based on feature fitting, and belongs to the field of three-dimensional measurement. According to the method, preliminary contour extraction is realized based on a sheet metal part image, a rectangular contour is detected, and approximate quadrilateral fitting is carried out; sub-pixel contour extraction is carried out, corresponding point matching is realized, and a three-dimensional point cloud is reconstructed; and constructing a three-dimensional rectangular projection fitting model based on iterative rotation, and calculating three-dimensional rectangular parameters. Compared with a traditional method of fitting rectangles after three-dimensional point cloud reconstruction based on structured light, the method can reduce the problem of reconstruction errors of contour edge parts caused by illumination variation, image noise and the like, improves contour point cloud reconstruction precision, realizes automatic recognition of contours and accurate parameter acquisition, and improves the accuracy of contour point cloud reconstruction. And the accuracy of three-dimensional measurement of the profile of the sheet metal part is

Description

technical field [0001] The invention belongs to the field of three-dimensional measurement, and more particularly, relates to a three-dimensional measurement method and system for rectangular contours of sheet metal parts based on feature fitting. Background technique [0002] Sheet metal parts are widely used in aerospace, automobile manufacturing and other fields, with annual sales of the order of 100 billion yuan and a wide range of market applications. There are a large number of processing contours such as straight lines, round holes, and rectangles in sheet metal parts, which are used to realize functions such as positioning and connection. [0003] The existing three-dimensional measurement methods of sheet metal parts mainly include contact and non-contact. Among them, the contact-type three-dimensional measurement equipment includes vernier calipers, templates, three-coordinate measuring machines, etc., which have high precision but low efficiency and are difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T17/00G01B11/24
CPCG06T7/13G06T17/00G01B11/24Y02P90/30
Inventor 李中伟张攀钟凯史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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