Real-time range scanning of deformable surfaces by adaptively coded structured light

2004 ◽  
Author(s):  
T.P. Koninckx ◽  
A. Griesser ◽  
L. Van Gool
Keyword(s):  
Real Time ◽  
Structured Light ◽  
Time Range ◽  
Deformable Surfaces ◽  
Range Scanning

Real-time tracking of surfaces with structured light

1995 ◽  
Vol 13 (7) ◽  
pp. 585-591 ◽  
Author(s):  
Peter Lindsey ◽  
Andrew Blake
Keyword(s):  
Real Time ◽  
Structured Light ◽  
Real Time Tracking

Real-Time Sensing of Sag Geometry During GTA Welding

1997 ◽  
Vol 119 (2) ◽  
pp. 151-160 ◽  
Author(s):  
Y. M. Zhang ◽  
R. Kovacevic
Keyword(s):  
Real Time ◽  
Vision System ◽  
Structured Light ◽  
Gta Welding ◽  
Seam Tracking ◽  
Image Processing Algorithm ◽  
3D Vision ◽  
Full Penetration ◽  
Laser Stripe ◽  
Penetration Control

Seam tracking and weld penetration control are two fundamental issues in automated welding. Although the seam tracking technique has matured, the latter still remains a unique unsolved problem. It was found that the full penetration status during GTA welding can be determined with sufficient accuracy using the sag depression. To achieve a new full penetration sensing technique, a structured-light 3D vision system is developed to extract the sag geometry behind the pool. The laser stripe, which is the intersection of the structured-light and weldment, is thinned and then used to acquire the sag geometry. To reduce possible control delay, a small distance is selected between the pool rear and laser stripe. An adaptive dynamic search for rapid thinning of the stripe and the maximum principle of slope difference for unbiased recognition of sag border were proposed to develop an effective real-time image processing algorithm for sag geometry acquisition. Experiments have shown that the proposed sensor and image algorithm can provide reliable feedback information of sag geometry for the full penetration control system.

The State of the Art in Real-Time Range Mapping — A Panel Discussion

1990 ◽  
pp. 341-346
Author(s):  
Joseph Wilder ◽  
J.K. Aggarwal ◽  
P. Besl ◽  
T. Kanade ◽  
A. Slotwinski ◽  
...  
Keyword(s):  
Real Time ◽  
State Of The Art ◽  
Panel Discussion ◽  
The State ◽  
Time Range

scholarly journals Pulse Radar with Field-Programmable Gate Array Range Compression for Real Time Displacement and Vibration Monitoring

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 82
Author(s):  
Mihai-Liviu Tudose ◽  
Andrei Anghel ◽  
Remus Cacoveanu ◽  
Mihai Datcu
Keyword(s):  
Real Time ◽  
Cross Correlation ◽  
Vibration Monitoring ◽  
Time Range ◽  
Pulse Radar ◽  
Analog Front End ◽  
Compression Time ◽  
Field Programmable ◽  
Term Monitoring

This paper aims to present the basic functionality of a radar platform for real time monitoring of displacement and vibration. The real time capabilities make the radar platform useful when live monitoring of targets is required. The system is based on the RF analog front-end of a USRP, and the range compression (time-domain cross-correlation) is implemented on the FPGA included in the USRP. Further processing is performed on the host computer to plot real time range profiles, displacements, vibration frequencies spectra and spectrograms (waterfall plots) for long term monitoring. The system is currently in experimental form and the present paper aims to prove its functionality. The precision of this system is estimated (using the 3σ approximation) at 0.6 mm for displacement measurements and 1.8 mm for vibration amplitude measurements.

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