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A Research on 3d Model Construction from 2d dICOM

A Research on 3D Model Construction from 2D DICOM

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international conference on Advanced Computing and Applications (ACOMP)

作者： Van Sinh Nguyen Manh Ha Tran Hoang Minh Quang Vu Int Univ HCMC Sch Comp Sci & Engn Quarter 6 Thu Duc Hcm Vietnam

ISBN: (纸本)9781509061440

In recent years, the development of high techniques in the field of computer graphics, computer vision and images processing has been widely studied and applied in geometric modeling. Especially, in the field of 3d modeling and reconstruction of a 3d object from 2d images. One of these researches is the field of medical image processing. It has been invested and developed by researchers, both in computer science and medicine. This paper presents a survey research on construction and reconstruction of a 3d object from a set of 2d medical images. We first review the existing methods for building a 3d object from 2d medical image slices in dICOM (digital imaging and Communications in Medicine) format. They come from measurement devices in medicine like X-ray Computerized Tomography (X-ray CT), Magnetic Resonance imaging (MRI), etc. Thereafter, we construct an application based on the VTK library for building, visualizing and handling a 3d object from these CT scanned slices. This application can support medical staffs and doctors in diagnostic and treatment of patients.

关键词： 3d model Marching cube Ray casting Texture-based rendering Medical images processing dICOM

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3-d modeling from range imagery: an incremental method with a planning component

3-D modeling from range imagery: an incremental method with ...

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international conference on 3d imaging, modeling, Processing, Visualization and Transmission (3dIMPVT)

作者： M.K. Reed P.K. Allen I. Stamos Computer Science Department Columbia University NY USA

In this paper we present a method for automatically constructing a CAd model of an unknown object from range images. The method is an incremental one that interleaves a sensing operation that acquires and merges information into the model with a planning phase to determine the next sensor position or "view". This is accomplished by integrating a system for 3-d model acquisition with a sensor planner. The model acquisition system provides facilities for range image acquisition, solid model construction and model merging: both mesh surface and solid representations are used to build a model of the range data from each view, which is then merged with the model built from previous sensing operations. The planning system utilizes the resulting incomplete model to plan the next sensing operation by finding a sensor viewpoint that will improve the fidelity of the model. Experimental results are presented for a complex part that includes polygonal faces, curved surfaces, and large self-occlusions.

关键词： Three dimensional displays Solid modeling Merging Image sensors Sensor systems Surface reconstruction Computer science Layout Availability Reconstruction algorithms

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Building 3-d city models from multiple unregistered profile maps

Building 3-D city models from multiple unregistered profile ...

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international conference on 3d imaging, modeling, Processing, Visualization and Transmission (3dIMPVT)

作者： O. Jokinen Institute of Photogrammetry and Remote Sensing Helsinki University of Technology Espoo Finland

The paper presents an approach for building 3-d city models for virtual environments from multiple 3-d data sets acquired from different viewpoints by light striping. The raw data sets are represented as single valued parametric surfaces called the 3-d profile maps. The profile maps are registered to the same coordinate system by an iterative surface matching algorithm developed previously. The registration proceeds hierarchically from low to high resolution and all the data sets are matched simultaneously but an initial registration is assumed to be known. After having segmented each map by a region growing algorithm, the maps are integrated into a piecewise planar surface model by merging compatible segments in the overlapping areas. The borders of the segments are also traced an the parametric domains of the maps as a step for building a wireframe model. Test results are shown in the case of a scale model of an urban area digitized in laboratory conditions.

关键词： Cities and towns Iterative algorithms Urban areas Shape Image reconstruction Solid modeling Paper technology Virtual environment Testing Laboratories

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Current Situation on Spaceborne Hyperspectral Imager of TUBITAK Uzay: HSK 7

Current Situation on Spaceborne Hyperspectral Imager of TUBI...

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7th international conference on recent advances in Space Technologies (RAST)

作者： Yilmaz, Ozgur Unses, Emre Ucan, Meric Buyuk, Hakan Celebi, Muhammet Turk, Fethi Kirik, M. Sancay Haliloglu, Onur Celik, Vakkas Ekinci, Mustafa Guven, Erol Yilmaz, Ozan Acar, derya Aydogdu, M. Fatih Olca, Mert Selimoglu, Ozgur TUBITAK Uzay Space Technol Res Inst Electroopt Syst Grp TR-06531 Ankara Turkey

ISBN: (纸本)9781479976973

Tubitak Uzay has started a spaceborne hyperspectral imager development project two years ago. As hyperspectral remote sensing is getting popular, Tubitak Uzay has R&d projects both on hardware development and software applications of hyperspectral imaging. Project is at the PdR level now. Many trade-off cases are evaluated during the system engineering and preliminary design phases. We are presenting a summary of trade-off cases and lessons learnt during those studies. Optical, mechanical and electronical designs are also shown at the end of paper.

关键词： Hyperspectral imager HSK PdR (Preliminary design Review) SNR (Signal to Noise Ratio) OSF (Order Sorting Filter) AdC (Analog to digital Converter)

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ISSUES IN THE dESIGN OF AN IMAGE MAP WORKSTATION

ISSUES IN THE DESIGN OF AN IMAGE MAP WORKSTATION

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State-of-the-Art Mapping conference

作者： OLANdER, N GDE SYST HELAVA ASSOCIATESSAN DIEGOCA 92127

ISBN: (纸本)0819411795

An image map is a hardcopy cartographic product consisting of rectified imagery overlaid with graphical features and surrounded by marginalia. Image maps contain far more information than conventional maps and will be a major product of mapping systems of the future. recent advances in computer hardware design have made it possible to generate image maps on commercial hardware platforms at moderate cost and with high throughput rates. This advance is due primarily to increased computer speeds, larger disk capacities, and high-resolution monitors. This paper describes several issues that arose during the design and implementation of the digital Photogrammetric Workstation (dPW) at GdE Systems - Helava Associates, Inc. The dPW is built from off-the-shelf hardware, components and performs softcopy image exploitation tasks such as image map production, image enhancement, terrain extraction, and perspective scene rendering.

关键词： Image processing Sensors Visualization data modeling Image sensors Image enhancement Control systems Image visualization digital imaging Feature extraction

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Feature tracking for automated volume of interest stabilization on 4d-OCT images

Feature tracking for automated volume of interest stabilizat...

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conference on Medical imaging - Image-Guided Procedures, Robotic Interventions, and modeling

作者： Laves, Max-Heinrich Schoob, Andreas Kahrs, Lueder A. Pfeiffer, Tom Huber, Robert Ortmaier, Tobias Leibniz Univ Hannover Inst Mechatron Syst Appelstr 11A D-30167 Hannover Germany Univ Lubeck Inst Biomed Opt Peter Monnik Weg 4 D-23562 Lubeck Germany

ISBN: (数字)9781510607163

ISBN: (纸本)9781510607156;9781510607163

A common representation of volumetric medical image data is the triplanar view (TV), in which the surgeon manually selects slices showing the anatomical structure of interest. In addition to common medical imaging such as MRI or computed tomography, recent advances in the field of optical coherence tomography (OCT) have enabled live processing and volumetric rendering of four-dimensional images of the human body. due to the region of interest undergoing motion, it is challenging for the surgeon to simultaneously keep track of an object by continuously adjusting the TV to desired slices. To select these slices in subsequent frames automatically, it is necessary to track movements of the volume of interest (VOI). This has not been addressed with respect to 4d-OCT images yet. Therefore, this paper evaluates motion tracking by applying state-of-the-art tracking schemes on maximum intensity projections (MIP) of 4d-OCT images. Estimated VOI location is used to conveniently show corresponding slices and to improve the MIPs by calculating thin-slab MIPs. Tracking performances are evaluated on an in-vivo sequence of human skin, captured at 26 volumes per second. Among investigated tracking schemes, our recently presented tracking scheme for soft tissue motion provides highest accuracy with an error of under 2.2 voxels for the first 80 volumes. Object tracking on 4d-OCT images enables its use for sub-epithelial tracking of microvessels for image-guidance.

关键词： 4d imaging maximum intensity projection optical coherence tomography feature tracking

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Three-dimensional region-based adaptive image processing techniques for volume visualization applications

Three-dimensional region-based adaptive image processing tec...

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conference on Image display

作者： dedeusLopes, R Zuffo, MK Rangayyan, RM UNIV SAO PAULO ESCOLA POLITECNLAB SISTEMAS INTEGRAVEISBR-05508900 SAO PAULOBRAZIL

ISBN: (纸本)0819420824

recent advances in three-dimensional (3d) imaging techniques have expanded the scope of applications of volume visualization to many areas such as medical imaging, scientific visualization, robotic vision, and virtual reality. Advanced image filtering, enhancement, and analysis techniques are being developed in parallel in the field of digital image processing. Although the fields cited have many aspects in common, it appears that many of the latest developments in image processing are not being applied to the fullest extent possible in visualization. It is common to encounter the use of rather simple and elementary image pre- processing operations being used in visualization and 3d imaging applications. The purpose of this paper is to present an overview of selected topics from recent developments in adaptive image processing and demonstrate or suggest their applications in volume visualization. The techniques include adaptive noise removal; improvement of contrast and visibility of objects; space-variant deblurring and restoration; segmentation-based lossless coding for data compression; and perception-based measures for analysis, enhancement, and rendering. The techniques share the common base of identification of adaptive regions by region growing, which lends them a perceptual basis related to the human visual system. Preliminary results obtained with some of the techniques implemented so far are used to illustrate the concepts involved, and to indicate potential performance capabilities of the methods.

关键词： volume visualization medical imaging three-dimensional image processing image enhancement image coding image compression adaptive image processing region-based image processing noise removal contrast enhancement

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digital Twins: Simulating Robot-Human Sidewalk Interactions

Digital Twins: Simulating Robot-Human Sidewalk Interactions

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18th international 3d GeoInfo conference

作者： Hassan, Ali Usman, Muhammad Kremer, Melissa Yang, Seungho Luubert, Michael Faloutsos, Petros Hall, G. Brent Sohn, Gunho York Univ Dept Earth & Space Sci Engn Toronto ON M3J 1P3 Canada King Fahd Univ Petr & Minerals Dept Informat & Comp Sci Dhahran 31261 Saudi Arabia York Univ Dept Elect Engn & Comp Sci Toronto ON M3J 1P3 Canada Hanbat Natl Univ Dept Urban Engn Daejeon South Korea Esri Canada 900-12 Concorde Pl 4700 Toronto ON M3C 3R8 Canada

ISBN: (纸本)9783031437014;9783031436994;9783031436987

This paper investigates the interactions between sidewalk delivery robots and pedestrians in urban settings to evaluate pedestrian safety and robot efficiency in shared spaces. We developed a 3d digital twin environment model that allows realistic simulation of robot-human and robot-cityscape interactions, adopting the Pedestrian Aware Model (PAM) to ensure effective and safe navigation. Using an agent-based modeling approach, we analyze various scenarios involving pedestrians, wheelchair users, and robots sharing sidewalk spaces. Our findings reveal that robots do not inherently contribute to sidewalk congestion and can be programmed to maintain a buffer zone that allows for both safety and efficiency, suggesting their potential for smooth coexistence with pedestrians. We observed that robots caused most collisions, while pedestrians were primarily responsible for proximity violations of minimum distance thresholds, emphasizing the need for further research and strategies to reduce further the risks associated with these incidents. The results suggest that with careful design-oriented planning and continued research, robots can safely and comfortably share sidewalks with pedestrians, contributing to a more harmonious and efficient urban landscape. Our proposed simulation model can assist urban planners, policymakers, and researchers in evaluating the influence of various design interventions and policies on human-robot coexistence in cities, marking a crucial step toward accommodating both humans and robots in urban spaces.

关键词： digital twin Pedestrian behaviour Sidewalk autonomous delivery robots Human-robot interaction

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Automatic reconstruction of 3d objects using a mobile monoscopic camera

Automatic reconstruction of 3D objects using a mobile monosc...

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international conference on 3d imaging, modeling, Processing, Visualization and Transmission (3dIMPVT)

作者： W. Niem J. Wingbermuhle Institut für Theoretische Nachrichtentechnik und Informationsverarbeitung Universität Hannover Hanover Germany

A method for the automatic reconstruction of 3d objects from multiple camera views for 3d multimedia applications is presented. Conventional 3d reconstruction techniques use equipment that restrict the flexibility of the user. In order to increase this flexibility, the presented method is characterized by a simple measurement environment, that consists of a new calibration pattern placed below the object allowing object and pattern acquisition simultaneously. This ensures, that each view can be calibrated individually. From these obtained calibrated camera views, a textured 3d wireframe model is estimated using a shape-from-silhouette approach and texture mapping of the original camera views. Experiments with this system have confirmed a significant gain of flexibility for the user and a drastic reduction of costs for technical equipment while ensuring comparable model quality as conventional reconstruction techniques at the same time.

关键词： Cameras Calibration Image reconstruction Costs Charge-coupled image sensors Shape Focusing Teleconferencing Information systems Laser modes

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From coarse to fine correspondence of 3-d facial images and its application to 3-d facial caricaturing

From coarse to fine correspondence of 3-D facial images and ...

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international conference on 3d imaging, modeling, Processing, Visualization and Transmission (3dIMPVT)

作者： T. Kondo K. Murakami H. Koshimizu School of Computer and Cognitive Sciences Chukyo University Toyota Japan

We propose a method to generate a facial caricature depending on a simple method for corresponding 3-d facial images. In this method, we extract several facial parts regions each of which include facial parts of the face by using both gray and range images. The diagonal corners of the respective extracted regions are used to provide the informations on the correspondence between the faces. Therefore, by using this method, it is expectable to reduce the number of the feature points for the correspondence from more than several hundreds to ten or so. At the same time, this method makes it possible to extract boundaries of facial parts. In order to examine the feasibility of this method, we employ a usual corresponding method of the triangular patch as the reference. We generated the 3-d mean face and 3-d facial caricature to demonstrate experimentally the feasibility of the proposed method. It was clarified that the number of the correspondence points can be reduced to only 10% of the usual method.

关键词： Feature extraction Application software Nose Robustness Shape Radio access networks data mining Mouth Head Image processing

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