NDLI: Online seam tracking for laser welding with a vision chip and FPGA enabled camera system

Content Provider	IEEE Xplore Digital Library
Author	Santti, T. Poikonen, J.K. Lahdenoja, O. Laiho, M. Paasio, A.
Copyright Year	2015
Description	Author affiliation: Technol. Res. Center (TRC), Univ. of Turku, Turku, Finland (Santti, T.; Poikonen, J.K.; Lahdenoja, O.; Laiho, M.; Paasio, A.)
Abstract	This paper presents the implementation of optical seam tracking for a laser welding process with parallel image processing on a smart camera. Real-time extraction of the seam location and direction is enabled by a combination of massively parallel focal plane processing on a Vision Chip and Hough-transform based analysis on an FPGA. The implementation of all analysis within a single embedded camera system offers low-lag control for correcting the path of a welding robot. The vision chip provides illumination adaptive image sensing and neighborhood based feature segmentation. To extract the dominant line from the segmented data, an auxiliary FPGA processor performs Hough analysis on the reduced binary data from the vision chip. The system can achieve a line extraction speed of more than 1000 fps, which enables real-time visual seam tracking and robot control. Evaluation results from on-line laser welding tests with processing performed on the camera system are reported in the article.
Starting Page	1985
Ending Page	1988
File Size	691286
Page Count	4
File Format	PDF
ISBN	9781479983919
DOI	10.1109/ISCAS.2015.7169064
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-24
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Welding Field programmable gate arrays Image segmentation Cameras Feature extraction Process control laser welding array processing focal plane processor FPGA smart camera seam tracking
Content Type	Text
Resource Type	Article

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