Method and device for measuring curved surface

Abstract

The invention relates to a curved surface measuring device and a measuring method thereof. The measuring device comprises a lanyard and a camera device, wherein, the lanyard is tightly stretched on the surface of an object to be measured and coincides with the profile curve of the object to be measured; the measuring method includes the following steps: step one, a parameter set of the measuring device is determined; step two, the lanyard is tightly stretched on the surface of the object to be measured; step three, a picture of the lanyard is taken and the image is input into a computer; step four, the image of the lanyard is analyzed and curvilinear coordinate data of the centerline of the lanyard are calculated; and step five, the centerline of the lanyard is processed by equidistant offset calculation towards one side of the object to be measured while the offset amount is equal to the semidiameter of the lanyard and then a curve is obtained, namely the profile curve of the corresponding position of the object to be measured. By utilizing a certain amount of the lanyards, the curved surface data of the object to be measured is obtained.

Description

【Technical Field】 [0001] The invention relates to a mechanical optical measuring device and method, in particular to a curved surface measuring device and a measuring method. 【Background technique】 [0002] In some special occasions, it is necessary to measure the irregular curved surface of human body parts or other objects, such as the curved surface shape of the sole of the human body under weight. However, due to the irregularity of these curved surface shapes, it is difficult to directly measure. [0003] A traditional measurement method is the contact measurement method, which mainly uses servo control to move the measuring head along the surface of the object to be measured, and obtain the trajectory coordinates through the servo system to determine the shape of the object surface. However, the measurement equipment of this measurement method is relatively expensive and the measurement efficiency is low, which is not conducive to large-scale use. [0004] Another tradition...

AI Technical Summary

Problems solved by technology

Compared with cables, the equipment and control of special light sources are more complicated and costly

On the other hand, although the fringe pattern projected by the special light source on the measured object is similar to the shape of the cable, due to physical and optical reasons, the dense fringe projected pattern on the surface of the measured object will cause interference, intensity Unequal reflections that make the image unclear

At the same time, since the distance of the projected image on the measured surface is not equal everywhere, the quality of the projected image is further reduced

In addition, the optical characteristics of the measured object will also affect the quality of the projected pattern, for example, it is impossible to form an effective projected pattern on the surface of a transparent object

Images