An onsite inspection sensor for the formation of hull plates based on active binocular stereovision

Wang, Zhenxing; Wu, Zhuoqi; Zhen, Xijin; Yang, Ruijie; Xi, Juntong

doi:10.1177/0954405414545388

Cited by 12 publications

(10 citation statements)

References 22 publications

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“…26,27 This is done by performing the translations and rotations between point clouds that best match equivalent points in both data sets. One of the most usual 6,28 and best methods for doing so is the iterative closest point (ICP) method, 29,30 which minimizes the root mean square of the average distance between the corresponding points of two point clouds. The point matching of this method implies that necessarily one of the point clouds is a subpart of the other or that there is a sufficient overlap between point clouds: according to Rabbani et al, 30 the minimum overlapping is around 25%–30%.…”

Section: Machine–part Referencing Methodsmentioning

confidence: 99%

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An automatic method for the self-referencing and operation of portable machines

Eguia

Lamíkiz

Uriarte

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article proposes a new method to perform the referencing procedure between the workpiece and small portable machines that can move along large parts to perform machining operations. The method is based on natural fiducials which are detected by a laser scanner and their identification in the computer-aided design file, without feature extraction. Once the usual requirements of the referencing of portable machines are studied, the method has been experimentally validated on a conventional three-axis milling machine to establish its accuracy, obtaining systematic and random errors and also its overall utility. The errors created by the experimental campaign have been studied and isolated, thus giving results that faithfully represent the proposed method. The results are compared with other state-of-the-art techniques to establish comparative accuracy values. Finally, the referencing method is expanded and integrated in an automatic working mode to operate portable machines and solve both local and distributed machining operations. To test this, the automatic method has been used to command machining operations in a conventional three-axis milling machine as it would be in portable machines to prove feasibility and overall validity.

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Section: Machine–part Referencing Methodsmentioning

confidence: 99%

“…A sound alternative to eliminate the risky contacts would be using any of the available non-contact technologies for machine–part inter-referencing. In this sense, scientific literature shows interesting examples of vision systems, 6 photogrammetry 7 or line laser scanners. 8…”

Section: Introduction: Portable Machines and Referencing Issuesmentioning

confidence: 99%

An automatic method for the self-referencing and operation of portable machines

Eguia

Lamíkiz

Uriarte

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Features of hoses and related fasteners were analyzed to perform image processing, object extraction, and feature recognition. Wang et al 4 developed an alternative measurement sensor for onsite inspection of hull plates, providing accurate quantitative results with high efficiency. Chen and Chang 5 incorporated a linear regression diagnostic model with digital image processing techniques to inspect TFT-LCD Mura defects automatically.…”

Section: Introductionmentioning

confidence: 99%

Automated quality inspection of camera zooming with real-time vision

Chang

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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Industrial automated production technologies have been the research focus of many recent studies, comprising the two research streams of automated assembly and automated product testing. Camera lens-shake detection is an effective way to measure the quality of video cameras during zooming. Conventional testing methods involve time-consuming manual operation procedures. This study proposes a novel automated camera lens-shake detection method, in which real-time visual tracking of two arbitrary features is used to measure and analyze camera zooming quality. The camera lens-shake detection approach can be used to screen out video cameras for the purpose of quality control. It can be effectively employed to replace conventional testing methods and enhance efficiency and stability of product manufacturing.

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“…Generally, spots are projected onto a measured surface, and are captured by one or multiple cameras. 3,4 Another way to extract the center of a spot is achieved by detecting an ellipse which matches the contour of the spot very well. Finally, if the corresponding centers between two different views are matched, the 3-D reconstructions of these spots can be obtained by triangulation.…”

Section: Introductionmentioning

confidence: 99%

Iteration-based direct ellipse-specific algebraic fitting method of incomplete spots for onsite three-dimensional measurement

Wang

Zhen

et al. 2015

Opt. Eng

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The direct ellipse-specific algebraic fitting (DESAF) method proposed by Fitzgibbon is a classical method to fit an ellipse from discrete points. Generally, for a complete spot, an ellipse, which coincides well with the complete contour of the spot, can be fitted by DESAF. However, for an incomplete spot damaged by some noises such as nonuniform optical surfaces, depth steps, and occlusion, DESAF would fit an incorrect ellipse which could not accurately match the complete contour of the spot. We analyze this problem encountered in the onsite three-dimensional measurement of hull plates and propose a method to remove these outlier points from the contours of incomplete spots. The experiments of computer simulated data and real data demonstrate that the proposed method can dramatically remove the outlier points from the contour and improve the detection accuracy of the center of the incomplete spot.

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An onsite inspection sensor for the formation of hull plates based on active binocular stereovision

Cited by 12 publications

References 22 publications

An automatic method for the self-referencing and operation of portable machines

An automatic method for the self-referencing and operation of portable machines

Automated quality inspection of camera zooming with real-time vision

Iteration-based direct ellipse-specific algebraic fitting method of incomplete spots for onsite three-dimensional measurement

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