3D-optical measurement system using a new vignetting aperture procedure

2014 ◽  
Author(s):  
Engelbert Hofbauer ◽  
Rolf Rascher ◽  
Konrad Wühr ◽  
Felix Friedke ◽  
Thomas Stubenrauch ◽  
...  
Keyword(s):  
Measurement System ◽  
Optical Measurement ◽  
Optical Measurement System ◽  
3D Optical Measurement

Intraoral 3D optical measurement system for tooth restoration

Optik ◽  
2013 ◽  
Vol 124 (12) ◽  
pp. 1142-1147 ◽  
Author(s):  
Haihua Cui ◽  
Ning Dai ◽  
Wenhe Liao ◽  
Xiaosheng Cheng
Keyword(s):  
Measurement System ◽  
Optical Measurement ◽  
Optical Measurement System ◽  
3D Optical Measurement

scholarly journals Analysis of Tool Geometry for the Stamping Process of Large-Size Car Body Components Using a 3D Optical Measurement System

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7608
Author(s):  
Artur Rękas ◽  
Tomasz Kaczmarek ◽  
Michał Wieczorowski ◽  
Bartosz Gapiński ◽  
Michał Jakubowicz ◽  
...  
Keyword(s):  
Measurement System ◽  
Optical Measurement ◽  
Laser Scanner ◽  
Essential Element ◽  
Tool Geometry ◽  
Body Parts ◽  
Technological Parameters ◽  
Optical Measurement System ◽  
Car Body ◽  
3D Optical Measurement

The paper presents a method for checking the geometry of stamped car body parts using a 3D optical measurement system. The analysis focuses on the first forming operation due to the deformation and material flow associated with stall thresholds. An essential element of the analysis is determining the actual gap occurring between the forming surfaces based on the die and punch geometry used in the first stamping operation. The geometry of car body elements at individual production stages was analyzed using an optical laser scanner. The control carried out in this way allowed one to correctly position the tools (punch and die), thus introducing the correction of technological parameters, having a fundamental influence on the specific features of the final product. This type of approach has not been used before to calibrate the technological line and setting of shaping tools. The influence of the manufactured product geometry in intermediate operations on the final geometry features was not investigated.

scholarly journals Alignment Method of an Axis Based on Camera Calibration in a Rotating Optical Measurement System

2020 ◽  
Vol 10 (19) ◽  
pp. 6962
Author(s):  
Yanli Hou ◽  
Xianyu Su ◽  
Wenjing Chen
Keyword(s):  
Camera Calibration ◽  
Measurement System ◽  
Optical Measurement ◽  
Ccd Camera ◽  
Least Square ◽  
Optical Center ◽  
External Parameter ◽  
Optical Measurement System ◽  
Rotation Center ◽  
Projection Center

The alignment problem of a rotating optical measurement system composed of a charge-coupled device (CCD) camera and a turntable is discussed. The motion trajectory model of the optical center (or projection center in the computer vision) of a camera rotating with the rotating device is established. A method based on camera calibration with a two-dimensional target is proposed to calculate the positions of the optical center when the camera is rotated by the turntable. An auxiliary coordinate system is introduced to adjust the external parameter matrix of the camera to map the optical centers on a special fictitious plane. The center of the turntable and the distance between the optical center and the rotation center can be accurately calculated by the least square planar circle fitting method. Lastly, the coordinates of the rotation center and the optical centers are used to provide guidance for the installation of a camera in a rotation measurement system. Simulations and experiments verify the feasibility of the proposed method.

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