Part surface pattern detection method based on binocular vision and reverse model reconstruction

Abstract

The invention provides a part surface pattern detection method based on binocular vision and reverse model reconstruction. The method comprises the following steps: acquiring a large curved surface part processing file; based on the part surface pattern, performing high-precision contour three-dimensional reconstruction under a multi-boundary condition to obtain contour point cloud data of a plurality of different measurement viewpoints, and splicing the contour point cloud data of the plurality of different measurement viewpoints to obtain a target pattern three-dimensional point cloud; geodesic distances from all machining points on the standard digital-analog contour to the four positioning holes are calculated; fitting a curved surface of the to-be-measured large curved surface part in actual measurement based on the structured light, and reversely generating an actual measurement CAD contour; and carrying out modulus comparison on the three-dimensional point cloud of the target pattern and the actually measured CAD contour, and calculating a contour detection error. The method does not need to be fixed through a clamp in the measuring process, data comparison can still be conducted after the part deforms, and automatic and high-precision measurement of the surface machining pattern of the large curved surface part is achieved.

Description

technical field [0001] The invention relates to the technical field of visual inspection, in particular to a part surface pattern detection method based on binocular vision and reverse model reconstruction. Background technique [0002] Visual inspection technology obtains images of the measured object at different positions and directions through visual equipment, and obtains the information of the measured object through image processing and analysis, and then determines the accuracy of the measured object. Visual inspection technology is a non-contact measurement method, which has the advantages of fast detection speed, good flexibility, and large measurement range. It is widely used in the inspection, adjustment, and assembly of large-scale machines, equipment, and structures in aviation, aerospace, and automotive fields. and installation etc. [0003] In the manufacturing process of large components such as aviation chemical milling parts, the processing accuracy of fi...

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Problems solved by technology

[0005] In view of this, this application proposes a part surface pattern detection method based on binocular vision and reverse model reconstruction, which is used to solve the problem of poor three-dimensional measurement accuracy of existing large-scale curved surface parts surface processing patterns

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