Three-dimensional surface shape detection method and device

Abstract

The invention relates to a three-dimensional surface shape detection method and device, and the method comprises the following steps: a, projecting a stripe pattern to a detected object, and monitoring a projection process; b, switching to the next stripe pattern after the projection of the current stripe pattern is completed; and c, calculating the three-dimensional contour morphology of the measured object according to the projection information reflected by the measured object. The projection equipment is monitored in the projection process of the projection equipment, so that the next pattern is immediately switched after the projection of the current stripe pattern is completed, and the overall detection efficiency is improved.

Description

technical field [0001] The invention relates to a three-dimensional surface shape detection method and a device for implementing the method. Background technique [0002] At present, most of the methods for detecting the surface profile of free-form surfaces are measured by three-coordinate measuring equipment, but three-coordinate measurement is a kind of contact measurement, the measurement period is long, the measurement equipment is expensive, and the measured object may be squeezed during the measurement process. Compression causes deformation, resulting in data distortion. There is also a projected grating non-contact measurement technology, which needs to project an image onto the surface of the object to be measured, and the calculation process is relatively complicated, and there is a large cumulative error in the process, and the accuracy is low. Moreover, the installation of various cameras and projection devices in the conventional technology cannot measure tran...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the methods for detecting the surface profile of free-form surfaces are measured by three-coordinate measuring equipment, but three-coordinate measurement is a kind of contact measurement, the measurement period is long, the measurement equipment is expensive, and the measured object may be squeezed during the measurement process. Deformation caused by compression, resulting in data distortion

There is also a projected grating non-contact measurement technology, which needs to project images onto the surface of the object to be measured, and the calculation process is more complicated, there is a large cumulative error in the process, and the accuracy is low

Moreover, the installation of various cameras and projection devices in the traditional technology cannot measure transparent glass curved surface products

[0003] In addition, in the traditional detection equipment, the fringe projection device needs a period of refresh time for each fringe pattern projected, and the device cannot feedback whether the refresh is completed. Therefore, each time a pattern is projected, it needs to wait for a fixed period of time for the projection refresh After completion, project the next stripe pattern, the more patterns there are, the more waiting time will accumulate

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