Method and device for controlling laser power in three-dimensional scanning system

Abstract

The invention provides a method for controlling the power of a laser in a three-dimensional scanning system, comprising: collecting reflected light projected by a laser onto an object to be scanned to generate an image of the object to be scanned, and the laser is a laser capable of projecting at least one inline laser line; The power of the laser is adjusted based on the image of the scanned object until the power of the laser meets a preset condition. The invention can effectively adjust the power of the laser to a reasonable range, thereby effectively improving the adaptability of the three-dimensional scanning system to the scanning environment. The invention also discloses a control device for laser power in a three-dimensional scanning system.

Description

technical field [0001] The invention relates to the technical field of reverse engineering, in particular to a method and device for controlling laser power in a three-dimensional scanning system. Background technique [0002] For a long time, the precise measurement of the geometric dimensions of real objects mainly uses contact-type manual measurement methods such as vernier calipers, micrometers, and angle rulers. This measurement method cannot measure the surface of irregular objects and requires non-contact for cultural relics and historic sites There are also technical bottlenecks in measuring objects. With the development of related disciplines and the drive of new technology and new needs, 3D scanning technology has emerged as the times require. This technology can calculate the spatial distribution of point clouds based on the collected object surface information without touching the measured object. Through A series of surface reconstruction methods integrate poin...

AI Technical Summary

Problems solved by technology

[0004] According to the principle of triangulation, the point cloud data on the surface of the scanned object is calculated from the position of the laser line center in the stereo image. The higher the extraction accuracy of the laser line center in the image, the more accurate the calculated point cloud data. When the laser power is reasonable The brightness of the center of the laser line in the image collected during the interval is the highest, and the brightness gradually decreases along the center to the edges on both sides, and the width of the high-brightness area in the center of the laser line is very narrow. This imaging feature is very conducive to extracting the precise center position of the laser line; When the laser power is too low, because the light intensity of the laser line is lower than the sensitivity of the detector, the imaging area of ​​the laser line in the collected image has no obvious difference from other areas, so the position of the center of the laser line cannot be accurately extracted; When the power is too high, the detector is saturated due to the high light intensity of the laser line. Although the imaging area of ​​the laser line in the collected image is clearly distinguished from other areas, the high-brightness area is too wide, so it is still impossible to accurately extract the laser light. position of line center

Images