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High-speed optical sensor for security applications

PHOTONICS SPECTRA 2004年第4期38卷 90-+页

作者： Grevel, Td 3D Image Processing GmbH

with the increasing demand for security, passive optical sensors are helping to keep the public's safety. They typically are used in video cameras that generate a two-dimensional image on a screen. As such, cameras gain stereo 3-d vision based on human brain function. A three-dimensional technology is under development by 3d image processing GmbH of Munich, Germany, that offers a way to perform real-time distance measurement.

关键词： Optical sensors

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A video depth refinement with circuit model constraint 11

A video depth refinement with circuit model constraint

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SIGGRAPH Asia 2011 Posters, SA'11

作者： Ho, Chia-Hang Wu, Chun-Te Huang, Wei-Jia 3D Image Processing Division Electronic and Opto-Electronics Research Laboratories Industrial Technology Research Institute Taiwan

ISBN: (纸本)9781450311373

The raise of 3d image market is rapid. In previous work [Wang 2008], distortion and grid line bending constraints is adapted to image resizing while important areas remain the same scale. In another previous work [Lang 2010], disparity of input stereo image is remapped, and warped stereo image pairs are manipulated by similar constraints. In our system, we adapt image constraints similar to Lang's work, but for a depth refinement purpose. Original random and sharp depth error causes deformation and large defect of hole-filling. These errors are refined, but with a consequence of blurred depth edge. So we adapt another circuit model constraint to sharpen the depth edge again, but maintain the smoothed results at the same time. This technique is modified from previous work [Grady 2006], pixels are electrical circuit nodes with resistance derived from RGB difference. Generally, temporal smooth in video processing needs information from several frames. But in our system, no multiple frames involve but only current frame. In the same scene, different frames share similar color and shape. Since depth map is refined by 2d image, and temporal 2d images are similar, refined depths tend to be smoothed and sharpened in similar way. Finally, depth map of previous frame is used as an initial depth map of current optimization. Experiment results in Figure 1 & 2 show significant improvement.

关键词： Timing circuits

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Balancing the customization and standardization:exploration and layout surrounding the regulation of the growing field of 3d-printed medical devices in China

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Bio-design and Manufacturing 2022年第3期5卷 580-606页

作者： Zhongboyu Jin Chaofan He Jianzhong Fu Qianqian Han Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Materials Processing and Mold Zhengzhou UniversityZhengzhou 450002China Cancer Center Zhejiang UniversityHangzhou 310058China National Institutes for Food and Drug Control Beijing 102629China

Medical devices are instruments and other tools that act on the human body to aid clinical diagnosis and disease treatment,playing an indispensable role in modern ***,the increasing demand for personalized medical devices poses a significant challenge to traditional manufacturing *** emerging manufacturing technology of three-dimensional(3d)printing as an alternative has shown exciting applications in the medical field and is an ideal method for manufacturing such personalized medical devices with complex ***,the application of this new technology has also brought new risks to medical devices,making 3d-printed devices face severe challenges due to insufficient regulation and the lack of standards to provide guidance to the *** review aims to summarize the current regulatory landscape and existing research on the standardization of 3d-printed medical devices in China,and provide ideas to address these *** focus on the aspects concerned by the regulatory authorities in 3d-printed medical devices,highlighting the quality system of such devices,and discuss the guidelines that manufacturers should follow,as well as the current limitations and the feasible path of regulation and standardization work based on this *** key points of the whole process quality control,performance evaluation methods and the concept of whole life cycle management of 3d-printed medical devices are ***,the significance of regulation and standardization is pointed ***,aspects worthy of attention and future perspectives in this field are discussed.

关键词： 3d printing Medical device Regulation Standardization

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Projection-based 3d bioprinting for hydrogel scaffold manufacturing

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Bio-design and Manufacturing 2022年第3期5卷 633-639页

作者： Yuan Sun Kang Yu Qing Gao Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Engineering for Life Group(EFL) Suzhou 215101China Key Laboratory of Materials Processing and Mold Zhengzhou UniversityZhengzhou 450002China Cancer Center Zhejiang UniversityHangzhou 310058China

Projection-based 3d bioprinting(PBP):a powerful method to fabricate 3d cellular structures Three-dimensional(3d)bioprinting has played an important role in tissue engineering and regenerative medicine areas over the past decade[1].different from traditional cell cultures in Petri dishes,3d bioprinting can build bionic structures with a better potential to become artificial organ substitutes[2–4].With the development of photocurable biomaterials,the projection-based 3d printing method has been successfully applied in biological research[5,6].

关键词： printing biomaterials projection

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Study of morphologic response of chondrocytes to uniaxial compression of articular cartilage

Study of morphologic response of chondrocytes to uniaxial co...

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6th IASTEd International Conference on Biomedical Engineering, BioMEd 2008

作者： Wu, J.P. Kirk, T.B. Milne, N. delaney, P.M. 3D Image Laboratory School of Mechanical Engineering University of Western Australia Perth Australia School of Anatomy and Human Biology University of Western Australia Perth Australia Optiscan Pty Ltd. Melbourne VIC Australia

ISBN: (纸本)9780889867215

Osteoarthritis is synonymous to the functional disorder of articular cartilage. Mechanical tests of articular cartilage offer a way to understand the tissue's functionality and osteoarthritis. during normal activities, chondrocytes (cells) are indirectly exposed to varied mechanical compressions exerted on articular cartilage. Study of the morphological response of chondrocytes to the mechanical compressions exerted on articular cartilage offers understanding the physical integrity of chondrocytes, and initial physiological change of articular cartilage for detecting early osteoarthritis. Fibre optic confocal microscopy uses fibre optic imaging technologies to study the internal microstructure of bulk articular cartilage. The technologies have led to develop confocal arthroscopy for in vivo studying the cellular structure of articular cartilage. Using fibre optic laser confocal microscopy and a developed computer image analysis software, we studied the morphological response of the chondrocytes in the superficial and transitional zone to the uniaxial compression of articular cartilage at 0.25MPa and 0.5MPa. The results suggest that the mechanical compression exerted on articular cartilage caused morphological changes of the chondrocytes, which can be measured by the technique described in this study. The technique developed in this study shows potential to develop a methodology for in vivo studying the physiological integrity of chondrocyte and early osteoarthritis.

关键词： Fibers

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Identification of behaviour laws and failure criteria parameters of composites based on off axes tests application : Composite polyester/Alfa

Identification of behaviour laws and failure criteria parame...

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作者： Smaoui, Hichem Chafra, Moez Moussaoui, Ali Chevalier, Yvon URMCS ENIT-LASMAP Ecole Polytechnique of Tunisia Laboratory of Biometric Materials and 3D Image-making Kassab Instiute Tunisia Vibroacoustic Group 3 rue F. Hainaut 93407 SAINT OUEN cedex France

The purpose of the present study is to propose a method for identifying the mechanical behaviour of composite materials based on off axes tests for various directions, in a more general framework including a large range of geometrical variables used in industry. We propose a mechanism based mode which strongly depends on the structural anisotropy of the material and on the orientation of loading. For failure we use a quadratic surface similar to Hill criterion, the coefficients of which depend on the type and the direction of loading. The proposed identification method is applied to a composite made out of woven vegetal fibres and a polyester resin matrix. The fibres are extracted from Alfa leaves which are abundant in North Africa, and are commonly used in the manufacturing of high quality paper.

关键词： Composite materials

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Epiploic appendagitis masquerading as pulmonary embolism

CMIGExtra: Cases

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CMIGExtra: Cases 2004年第1期28卷 1-3页

作者： Sites, V. Wald, C. Scholz, F. Department of Diagnostic Radiology Lahey Clinic Medical Center Burlington MA 01805 United States Department of Radiology Lahey Clinic United States 3D Laboratory for Advanced Image Analysis and Virtual Surgical Planning Lahey Clinic United States

There has been recent interest in the radiological literature regarding the various clinical manifestations of epiploic appendagitis, which may mimic many acute abdominal and pelvic conditions. We present a case of appendagitis masquerading as pulmonary embolism;to our knowledge the first reported such presentation with primary thoracic symptoms and findings prompting an initial workup for suspected pulmonary thrombembolism. Radiographic findings, differential diagnosis and the pertinent literature are briefly discussed. © 2003 Elsevier Ltd. All rights reserved.

关键词： Atelectasis Epiploic appendagitis Pulmonary thrombembolism

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Influence of laser parameters on segregation of Nb during selective laser melting of Inconel 718

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China Foundry 2021年第4期18卷 379-388页

作者： Liang Wang Ran Cui Bin-qiang Li Xue Jia Long-hui Yao Yan-qing Su Jing-jie Guo Tong Liu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China HIT-Chungu Joint Research Center for Additive Manufacturing Materials Anhui Chungu 3D Printing Institute of Intelligent Equipment and Industrial TechnologyWuhu 241200AnhuiChina

A transient three-dimensional powder-scale model was established for understanding the flow field and mass transfer within the molten pool during the selective laser melting(SLM)of Inconel 718 alloy by considering some important physical phenomena,such as,a transition from powder to solid,nonlinearities produced by temperature-dependent materials’properties,and fluid flow in the *** influence of laser power or scanning speed on the flow field and cooling rate was discussed in *** simulation results reveal that the motion of molten pool and higher cooling rate promote the mass transfer and benefit the solute distribution by increasing laser ***,with increasing the scanning speed,the melt flow speed and cooling rate are elevated,resulting in an agglomeration of the solute elements,which is ascribed to the shorter dwelling time of ***,the segregation of Nb can be effectively suppressed by increasing laser power or decreasing scanning speed,which can decrease the dwelling time of liquid.

关键词： selective laser melting Inconel 718 alloy flow field mass transfer segregation

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Elevation data compression using IFS-based three-dimensional fractal interpolation

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Chinese Optics Letters 2004年第10期2卷 582-585页

作者：吴思源周源华 Institute of Image Communication & Information Processing Shanghai Jiaotong University Shanghai 200030 Institute of Image Communication & Information Processing Shanghai Jiaotong University Shanghai 200030his letter presents a novel application of iterated function system (IFS) based three-dimensional (3D) fractal interpolation to compression elevation data. The parameters of contractive transformations axe simplified by a concise fractal iteration form with geometric meaning. A local iteration algorithm is proposed which can solve the non-separation problem when Collage Theorem is applied to find the appropriate fractal parameters. The elevation data compression is proved experimentally to be effective in reconstruction quality and time-saving.

This paper presents the application of iterated function system (IFS) based three-dimensional (3d) fractal interpolation to elevation data compression. The parameters of contractive transformations are simplified by a concise fractal iteration form with geometric meaning. A local iteration algorithm is proposed, which can solve the non-separation problem when Collage theorem is applied to find the appropriate fractal parameters. The elevation data compression is proved experimentally to be effective in. reconstruction quality and time-saving.

关键词： Algorithms Fractals Interpolation Iterative methods Three dimensional

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A new concept for high-speed Atline and Inlinect for up to 100% mass production process control 12

A new concept for high-speed Atline and Inlinect for up to 1...

引用

12th International Conference of the Slovenian Society for Non-destructive Testing: Application of Contemporary Non-destructive Testing in Engineering, ICNdT 2013

作者： Brunke, Oliver Hansen, Ferdinand Stuke, Ingo Friedrich Butz, Franz GE Sensing and Inspection Technologies GmbH Product Management for 3D Metrology and Failure Analysis Using Computer Tomography Wunstorf31515 Germany Volkswagen Foundry Process Development Hannover Germany GE Sensing and Inspection Technologies GmbH Image Processing Ahrensburg Germany Volkswagen Foundry Head of Foundry Hannover Germany

ISBN: (纸本)9789619353707

In manufacturing processes, inspection capability is increasingly used as early in the production value chain as possible to ensure that scrap and rework costs are minimised. Fast radiographic in-line inspection systems, fully unmanned and equipped with automatic defect recognition e.g. of castings, are now state-of-the-art technology. This paper explains the next evolutionary step within the X-ray technology of utilizing fast computer tomography technology, scanning concepts and algorithms fulfilling high- throughput requirements for different applications and first results of an atline / inlineCT evaluation at Volkswagen Foundry Hannover, Germany.

关键词： Computerized tomography

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