A Three-Dimensional Structured Light Vision System by Using a Combination of Single-Line and Three-Line Lasers

Abstract

A multi-line structured light measurement method that combines a single-line and a three-line laser, in which precision sliding rails and displacement measurement equipment are not required, is proposed in this paper. During the measurement, the single-line structured light projects onto the surface of an object and the three-line structured light remains fixed. The single-line laser is moved and intersects with the three-line laser to form three intersection points. The single-line light plane can be solved using the camera coordinates of three intersection points, thus completing the real-time calibration of the scanned light plane. The single-line laser can be scanned at any angle to determine the overall complete three-dimensional (3D) shape of the object during the process. Experimental results show that this method overcomes the difficulty of obtaining information about certain angles and locations and can effectively recover the 3D shape of the object. The measurement system’s repetition error is under 0.16 mm, which is sufficient to measure the 3D shapes of complicated workpieces.

A Cost-Effective Method for Automatically Measuring Mechanical Parts Using Monocular Machine Vision

“…Their study resulted in accuracies at 0.013 mm, 0.011 mm, and 0.015 mm, and mean standard deviations at 0.015 mm, 0.006 mm, and 0.005 mm. Finally, Sun et al [10] developed a structured light system using three lasers to analyze objects on a rotating plate for three-dimensional reconstruction. They evaluated their design with 40, 50, 60, and 70 mm gauge blocks and obtained average errors at 0.025 mm, 0.006 mm, 0.006 mm, and 0.03 mm, and standard deviations at 0.1099 mm, 0.1056 mm, 0.1007 mm, and 0.0856 mm, respectively.…”

“…Photogrammetry involves deriving three-dimensional geometry from photographic images [7,8]. Photogrammetry has found successful applications in various domains, e.g., for unmanned aerial vehicles and satellite mapping [9], bridge monitoring [7], threedimensional object reconstruction [10], 3D scene mapping [11], and precise object measurements [3,[12][13][14][15][16][17]. This field of study has versatile applications in many industries including geology, architecture, topography, automotive engineering, and aerospace [8].…”

“…Multiple methods exist for extracting measurements of an element from images, ranging from techniques based solely on monocular vision to those employing the triangulation of multiple elements, e.g., Stereoscopic Vision [11] and Pattern Projection [10].…”

High-efficiency flatness detection method for medium-thick steel plates based on multiline parallel laser vision

“…Therefore, multiline laser inspection offers increased accuracy in detection and faster speed in detection. Sun et al 21 . proposed a method for measuring structured light using multiple lines, including single-line and three-line lasers.…”

“…Therefore, multiline laser inspection offers increased accuracy in detection and faster speed in detection. Sun et al 21 proposed a method for measuring structured light using multiple lines, including single-line and three-line lasers. This method effectively addresses the challenge of obtaining accurate angle and position data, allowing for the efficient retrieval of a 3D shape of an object.…”