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Sensors 2017, 17(12), 2782; https://doi.org/10.3390/s17122782

Efficient Background Segmentation and Seed Point Generation for a Single-Shot Stereo System

1,2
,
1,2
and
1,2,3,*
1
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Shanghai Key Laboratory of Advanced Manufacturing Environment, Shanghai 200030, China
3
State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China
*
Author to whom correspondence should be addressed.
Received: 21 October 2017 / Revised: 21 November 2017 / Accepted: 30 November 2017 / Published: 1 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

Single-shot stereo 3D shape measurement is becoming more popular due to its advantages of noise robustness and short acquisition period. One of the key problems is stereo matching, which is related to the efficiency of background segmentation and seed point generation, etc. In this paper, a more efficient and automated matching algorithm based on digital image correlation (DIC) is proposed. The standard deviation of image gradients and an adaptive threshold are employed to segment the background. Scale-invariant feature transform (SIFT)-based feature matching and two-dimensional triangulation are combined to estimate accurate initial parameters for seed point generation. The efficiency of background segmentation and seed point generation, as well as the measuring precision, are evaluated by experimental simulation and real tests. Experimental results show that the average segmentation time for an image with a resolution of 1280 × 960 pixels is 240 milliseconds. The efficiency of seed point generation is verified to be high with different convergence criteria. View Full-Text
Keywords: single-shot 3D measurement; digital image correlation; background segmentation; seed point generation single-shot 3D measurement; digital image correlation; background segmentation; seed point generation
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Yang, X.; Chen, X.; Xi, J. Efficient Background Segmentation and Seed Point Generation for a Single-Shot Stereo System. Sensors 2017, 17, 2782.

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