Large-breadth workpiece three-dimensional data extraction method and system

Abstract

The invention discloses a large-breadth workpiece three-dimensional data extraction method and system. The method comprises the steps of enabling a workpiece and a scanning system to move relatively,and enabling a laser ray emitted by the scanning system to cover the breadth of the scanned workpiece; acquiring three-dimensional data on a breadth laser ray of the workpiece; calculating the distance between adjacent laser rays according to the relative movement speed of the workpiece and the scanning system and the image acquisition frequency of the scanning system; and splicing the three-dimensional data on all the laser rays according to the calculated distance to obtain the three-dimensional data of the breadth of the workpiece. The system comprises a scanning system, a robot, a high-speed pulse module, a PLC and an upper computer. Accurate splicing of three-dimensional data on the laser rays can be realized by combining the data acquisition speed of the camera and the movement speedof the robot so that the method and the system can adapt to the precision extraction requirements of different types of workpieces in different occasions.

Description

technical field [0001] The invention relates to the field of visual measurement, in particular to a method and system for extracting three-dimensional data of a large-format workpiece. Background technique [0002] In the field of mechanical processing, workpieces with a length and width of more than 500 mm are called large-format workpieces. The extraction of three-dimensional data on the workpiece surface is widely used in manufacturing processes such as dimension measurement, reverse engineering, and surface treatment. The rapid and high-precision extraction of three-dimensional data on the workpiece surface plays a vital role in promoting the development of the manufacturing industry. [0003] The 3D data of traditional large-format workpieces is obtained by hand-held 3D scanners. However, large-format workpieces have the characteristics of large format, heavy weight, large shape changes, and high fixed costs. Therefore, it is difficult to extract 3D data on the surface ...

AI Technical Summary

Problems solved by technology

[0004] 1) The single image acquisition of the camera can only acquire 3D data on one laser line, and the 3D data collected multiple times is difficult to splice accurately

[0005] 2) The acquisition of the robot's up and down movement will result in the same data on the Z axis in the vertical direction of the three-dimensional data of the workpiece, resulting in the accumulation of laser lines

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