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international conference on Power, Energy, Control and Transmission Systems (ICPECTS)

作者： K. Latha d. Kavitha S. Hemavathi K. Jayasakthi Velmurugan Neathi. R Department of CSE Sri Sairam Engg. College Chennai Tamil Nadu India Department of CSE Jeppiaar Engineering College

ISBN: (纸本)9781665462761

imaging technology has made tremendous progress in recent years, and digital images can now be captured by a variety of handheld devices such as mobile phones, wearables, tabs, and camcorders. These images are shared daily on social networks. Meanwhile, photo-editing software tools are making a comeback from the dawn of social networking, and filtering is just a few clicks away from your smart phone. These latest advances in image editing tools have eroded trust in digital images and cast doubt on their integrity and authenticity. Here, we use a machine learning algorithm (SVM) to effectively detect if an image has been manipulated and block users who try to upload altered images.

关键词： Support vector machines Machine learning algorithms Social networking (online) digital images Wearable computers Splicing Machine learning

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Using handheld devices for real-time wireless teleconsultation

Using handheld devices for real-time wireless teleconsultati...

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： K.A. Banitsas P. Georgiadis S. Tachakra d. Cavouras Department of Electrical and Computer Engineering Brunei University West London UK Medical Image and Signal Processing Laboratory Technological Educational Institute of Athens Athens Greece A&E Department North West London Hospitals NHS Trust Central Middlesex Hospital Central Middlesex Hospital London UK London UK

recent advances in the hardware of handheld devices, opened up the way for newer applications in the healthcare sector, and more specifically, in the teleconsultation field. Out of these devices, this paper focuses on the services that personal digital assistants and smartphones can provide to improve the speed, quality and ease of delivering a medical opinion from a distance and laying the ground for an all-wireless hospital. In that manner, PdAs were used to wirelessly support the viewing of digital imaging and communication in medicine (dICOM) images and to allow for mobile videoconferencing while within the hospital. Smartphones were also used to carry still images, multiframes and live video outside the hospital. Both of these applications aimed at increasing the mobility of the consultant while improving the healthcare service.

关键词： Handheld computers Hospitals Personal digital assistants Medical services Wireless LAN Biomedical imaging Personnel Mobile handsets Smart phones Application software

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Residual Geometric Feature Transform Network for 3d Surface Super-Resolution

Residual Geometric Feature Transform Network for 3D Surface ...

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

作者： Maolin Cui Wuyuan Xie Miaohui Wang Tengcong Huang College of Computer Science and Software Engineering Shenzhen University Shenzhen China College of Electronics and Information Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9781665426893

In 3d reconstruction, how to recover high-resolution 3d surface details from the existing low-resolution 3d surface is still a challenging problem. due to the unstructured and irregular characteristics of 3d data, it is usually difficult to obtain extremely dense 3d surface and capture detailed local features. To tackle this problem, this article introduces an effective deep convolutional network, namely RGFTNet, to perform 3d surface super-resolution in 2d normal domain. To restore dense surface details and learn sharp geometry structures simultaneously, a shape prior acquisition method is designed to achieve the high-quality shape normal from the input low-resolution one. Subsequently, the extracted shape normal as the shape prior is incorporated into a deep convolutional network through the Geometric Feature Transform (GFT) layer. Experimental results show the superiority of the proposed RGFTNet over several recent advances on both the computer-generated and the real-world data.

关键词： Point cloud compression Surface reconstruction Three-dimensional displays Shape Soft sensors Superresolution Transforms

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Global Context Aware Convolutions for 3d Point Cloud Understanding

Global Context Aware Convolutions for 3D Point Cloud Underst...

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

作者： Zhiyuan Zhang Binh-Son Hua Wei Chen Yibin Tian Sai-Kit Yeung Litemaze Technology VinAI Research Vietnam VinUniversity Vietnam Hong Kong University of Science and Technology

ISBN: (数字)9781728181288

ISBN: (纸本)9781728181295

recent advances in deep learning for 3d point clouds have shown great promises in scene understanding tasks thanks to the introduction of convolution operators to consume 3d point clouds directly in a neural network. Point cloud data, however, could have arbitrary rotations, especially those acquired from 3d scanning. recent works show that it is possible to design point cloud convolutions with rotation invariance property, but such methods generally do not perform as well as translation-invariant only convolution. We found that a key reason is that compared to point coordinates, rotation-invariant features consumed by point cloud convolution are not as distinctive. To address this problem, we propose a novel convolution operator that enhances feature distinction by integrating global context information from the input point cloud to the convolution. To this end, a globally weighted local reference frame is constructed in each point neighborhood in which the local point set is decomposed into bins. Anchor points are generated in each bin to represent global shape features. A convolution can then be performed to transform the points and anchor features into final rotation-invariant features. We conduct several experiments on point cloud classification, part segmentation, shape retrieval, and normals estimation to evaluate our convolution, which achieves state-of-the-art accuracy under challenging rotations.

关键词： Three-dimensional displays deep learning Task analysis Training Shape Neural networks Feature extraction

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Associate Model of Methods Used for Restoration / Conservation Resources

Associate Model of Methods Used for Restoration / Conservati...

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international conference on developments in eSystems Engineering (dESE)

作者： dragos Ene Roxana Radvan National Institute for Research and Development for Optoelectronics Magurele Romania

Restoration and conservation interventions are progressively more and more dependent upon benefits of newly developed techniques. Works carried out within the scopes of several restoration projects had evaluated such techniques based on, for examples 3d laser scanning, multispectral imaging or pigments identification by LIFS of LIBS etc and reported in open literatures in recent time. In order to simplify the present work we propose an internet web-tool, a 3d digital model with imagistic information mapped on the surface. Two texturing algorithms are presented; a first algorithm is based on projection principles, and a second one, a parametric projection. The 3d available representations will be chosen by a dropdown menu, with the possibility of choice of one or even more models to be shown. This will allow a comparison between the complementary data obtained by specified techniques, and with advantages offered by the 3d visualization, including 3d controls.

关键词： Three dimensional displays Solid modeling data models Laser modes Painting Internet Instruments

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Physical aspects of ultrasound hyperthermia of the chest wall

Physical aspects of ultrasound hyperthermia of the chest wal...

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： E.G. Moros Radiation Oncology Center Mallinckrodt Institute of Radiology Washington University School of Medicine Saint Louis MO USA

recent advances in the development of clinical ultrasound hyperthermia systems to treat superficially located cancerous volumes are presented, with emphasis on the treatment of tissues at high risk or with microscopic cancer, and of recurrent/persistent breast carcinoma on the chest wall. recent advances in microwaves based systems are also discussed for comparison. In recent years the demand has been for specialized systems, site and disease specific, with a high degree of dynamic power deposition control. A system under development at our institution to allow the simultaneous or sequential delivery of ultrasound hyperthermia and external photon/electron beam radiation is described in detail. The optimization of the system design and key physical parameters to achieve controlled heating in highly acoustically, thermally and physiologically heterogeneous tissues are presented while highlighting the engineering challenges encountered. Both laboratory and numerical modeling data are presented. The major advances achieved are delineated and future R&d efforts proposed.

关键词： Ultrasonic imaging Hyperthermia Control systems Microscopy Cancer Breast Electromagnetic heating diseases Electron beams design optimization

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Adaptation and applications of a realistic digital phantom based on patient lung tumor trajectories

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PHYSICS IN MEdICINE ANd BIOLOGY 2012年第11期57卷 3597-3608页

作者： Mishra, Pankaj St James, Sara Segars, W. Paul Berbeco, Ross I. Lewis, John H. Brigham & Womens Hosp Dana Farber Canc Inst Boston MA 02115 USA Harvard Univ Sch Med Boston MA USA Duke Univ Dept Radiol Durham NC 27710 USA

digital phantoms continue to play a significant role in modeling and characterizing medical imaging. The currently available XCAT phantom incorporates both the flexibility of mathematical phantoms and the realistic nature of voxelized phantoms. This phantom generates images based on a regular breathing pattern and can include arbitrary lung tumor trajectories. In this work, we present an algorithm that modifies the current XCAT phantom to generate 4d imaging data based on irregular breathing. First, a parameter is added to the existing XCAT phantom to include any arbitrary tumor motion. This modification introduces the desired tumor motion but, comes at the cost of decoupled diaphragm, chest wall and lung motion. To remedy this problem diaphragm and chest wall motion is first modified based on initial tumor location and then input to the XCAT phantom. This generates a phantom with synchronized respiratory motion. Mapping of tumor motion trajectories to diaphragm and chest wall motion is done by adaptively calculating a scale factor based on tumor to lung contour distance. The distance is calculated by projecting the initial tumor location to lung edge contours characterized by quadratic polynomials. data from ten patients were used to evaluate the accuracy between actual independent tumor location and the location obtained from the modified XCAT phantom. The RMSE and standard deviations for ten patients in x, y, and z directions are: (0.29 +/- 0.04, 0.54 +/- 0.17, and 0.39 +/- 0.06) mm. To demonstrate the utility of the phantom, we use the new phantom to simulate a 4dCT acquisition as well as a recently published method for phase sorting. The modified XCAT phantom can be used to generate more realistic imaging data for enhanced testing of algorithms for CT reconstruction, tumor tracking, and dose reconstruction.

关键词： Medical physics Biological physics

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Novel 3d Reconstruction modeling Contributes to development of Orthopaedic Surgical Interventions

Novel 3D Reconstruction Modeling Contributes to Development ...

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The 4th international conference on Bioinformatics and Biomedical Engineering(第四届IEEE生物信息与生物医学工程国际会议 iCBBE 2010)

作者： Xing Ma Xiaoming Wu Yaoping Wu Jian Liu Long Sun Department of Orthopaedics First Affiliated Hospital of Medical School Xi’an Jiaotong University Xi’ Department of Orthopaedics First Affiliated Hospital of Medical School Xi'an Jiaotong University Xi' Department of Biomedical Engineering Xi'an 710032 P.R.China Department of Orthopaedics Xijing Hospital Fourth Military Medical University Xi'an 710032 P.R.Ch

Radiology plays important roles in orthopaedicsurgery. Although various conventional radiological assessmentsincluding digital X-rays, magnetic resonance imaging (MRI),computerized tomography (CT) and the three-dimensional (3d)CT reconstruction images have been widely developed andutilized for preoperative assessment and planning, there arelimitations. For example, despite the advances in 3d digitalreconstruction images, the 3d structure, anatomy and damagedsituation are still being inspected in a separate and flat manner(i.e. paper, film, etc.). Therefore the requirement of real 3dmodels for bone and joint has emerged clinically. In the presentstudy, a CAd based 3d visualization system and a rapidprototyping (RP) technique were used to fabricate 3d physicalmodels of highly difficult fractures and severe deformities inskeleton including severe pelvic/acetabular fractures,comminuted proximal humeral fractures, talar/ankle jointfractures, scoliolosis and progressive deformities in *** and benefits of the biomedical visualization-basedorthopaedic surgical strategies were elucidated.

关键词： Orthopedic surgery Image reconstruction Computed tomography Magnetic resonance imaging Joints Visualization Radiology X-rays Anatomy Bones

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RIVQ-VAE: discrete Rotation-Invariant 3d Representation Learning

RIVQ-VAE: Discrete Rotation-Invariant 3D Representation Lear...

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

作者： Mariem Mezghanni Malika Boulkenafed Maks Ovsjanikov LIX Ecole Polytechnique IP Paris

ISBN: (数字)9798350362459

ISBN: (纸本)9798350362466

Building local surface representations has recently attracted significant attention in 3d vision, allowing to structure complex 3d shapes as sequences of simpler local geometries. Inspired by advances in 2d discrete representation learning, recent approaches have proposed to break up 3d shapes into regular grids, where each cell is associated with a discrete code sampled from a learnable codebook. Unfortunately, existing methods ignore both the local rigid self-similarities as well as the ambiguities inherent to 3d geometry related to possible changes in orientation. As a result, such techniques require very large codebooks to capture all possible variability in both geometry and pose. In this work, we propose a novel generative model that improves the generation quality by compactly embedding local geometries in a rotation- and translation-invariant manner. This strategy allows our codebook of discrete codes to express a larger range of geometric structures by avoiding local and global redundancies. Crucially, we demonstrate via a careful architecture design that our approach allows to recover meaningful shapes from local embeddings, while ensuring global consistency. The conducted experiments show that our approach outperforms baseline methods by a large margin under similar settings.

关键词： Geometry Representation learning Surface reconstruction Three-dimensional displays Codes Shape Computer architecture

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A 200 mW 3.3 V CMOS color camera IC producing 352/spl times/288 24 b video at 30 frames/s

A 200 mW 3.3 V CMOS color camera IC producing 352/spl times/...

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IEEE international conference on Solid-State Circuits (ISSCC)

作者： M. Loinaz K. Singh A. Blanksby d. Inglis K. Azadet B. Ackland Bell Laboratories Lucent Technologies Inc. Holmdel NJ USA University of Adelaide Australia

recent advances in CMOS imaging technology enable the creation of single-chip digital cameras that offer system designers fully-digital interfaces, reduced part counts, and low-power dissipation. A PC-based camera system is described using a single-chip camera. The chip produces digital video data that is fed to the host over a standard interface. The host adjusts operation of the camera by setting frame rate, exposure time, analog gains, and color processing coefficients. Frame-rate functions, such as exposure control and white balance algorithms, are in software on the host, while pixel-rate tasks requiring intensive computation, such as color interpolation, color correction, and calculation of image statistics are in hardware on the camera chip.

关键词： CMOS image sensors CMOS integrated circuits Color CMOS technology digital cameras Software algorithms Pixel Interpolation Statistics Hardware

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