Mr. Hui Shi Profile

Hui Shi

at Harbin Univ of Science and Technology

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Proceedings Article | 23 November 2011 Paper

High speed web printing inspection with multiple linear cameras

Hui Shi, Wenyong Yu

Proceedings Volume 8006, 800624 (2011) https://doi.org/10.1117/12.901868

KEYWORDS: Printing, Inspection, Image processing, Cameras, Machine vision, Chemical elements, Imaging systems, Computing systems, Digital signal processing, RGB color model

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Purpose: To detect the defects during the high speed process of web printing, such as smudges, doctor streaks, pin holes, character misprints, foreign matters, hazing, wrinkles, etc., which are the main infecting factors to the quality of printing presswork. Methods: A set of novel machine vision system is used to detect the defects. This system consists of distributed data processing with multiple linear cameras, effective anti-blooming illumination design and fast image processing algorithm with blob searching. Also, pattern matching adapted to paper tension and snake-moving are emphasized. Results: Experimental results verify the speed, reliability and accuracy of the proposed system, by which most of the main defects are inspected at real time under the speed of 300 m/min. Conclusions: High speed quality inspection of large-size web requires multiple linear cameras to construct distributed data processing system. Also material characters of the printings should also be stressed to design proper optical structure, so that tiny web defects can be inspected with variably angles of illumination.

Proceedings Article | 30 October 2009 Paper

To generate a finite element model of human thorax using the VCH dataset

Hui Shi, Qian Liu

Proceedings Volume 7496, 74960B (2009) https://doi.org/10.1117/12.832780

KEYWORDS: 3D modeling, Reverse modeling, Bone, Finite element methods, Data modeling, Image segmentation, Visualization, Cartilage, Visual process modeling, Solids

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Purpose: To generate a three-dimensional (3D) finite element (FE) model of human thorax which may provide the basis of biomechanics simulation for the study of design effect and mechanism of safety belt when vehicle collision. Methods: Using manually or semi-manually segmented method, the interested area can be segmented from the VCH (Visible Chinese Human) dataset. The 3D surface model of thorax is visualized by using VTK (Visualization Toolkit) and further translated into (Stereo Lithography) STL format, which approximates the geometry of solid model by representing the boundaries with triangular facets. The data in STL format need to be normalized into NURBS surfaces and IGES format using software such as Geomagic Studio to provide archetype for reverse engineering. The 3D FE model was established using Ansys software. Results: The generated 3D FE model was an integrated thorax model which could reproduce human's complicated structure morphology including clavicle, ribs, spine and sternum. It was consisted of 1 044 179 elements in total. Conclusions: Compared with the previous thorax model, this FE model enhanced the authenticity and precision of results analysis obviously, which can provide a sound basis for analysis of human thorax biomechanical research. Furthermore, using the method above, we can also establish 3D FE models of some other organizes and tissues utilizing the VCH dataset.

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