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检索条件"任意字段=Conference on Visual Communications and Image Processing 2003"

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A computational model of neural contour processing: Figure-ground segregation and illusory contours

A computational model of neural contour processing: Figure-g...

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International conference on Computer Vision (ICCV)

作者： F. Heitger R. von der Heydt Communication Technology Laboratory Swiss Federal Institute of Technology Zurich Switzerland Department of Neurology University Hospital Zurich Zurich Switzerland

The detection of occluding contours in images of 3-D scenes is a fundamental problem of vision. The authors present a computational model of contour processing that was suggested by neurophysiological recordings from the monkey visual cortex. The model uses convolutions and nonlinear operations, but no feedback loops. Contours are defined by the local maxima of the responses of a contour operator that sums a representation of contrast borders and a grouping signal. The grouping consists of convolving a representation of key-points, such as T-junctions, corners, and line ends, with a set of orientation selective kernels, and a nonlinear pairing operation. The grouping scheme is selective based on whether the configuration of key-points is consistent with the interpretation of occlusion. The resulting contour representation includes an indicator of figure-ground direction. It is shown that the model reproduces illusory contours in accurate agreement with perception and generates representations of occluding contours on images of natural scenes that are more complete and less cluttered by spurious connections of foreground and background than those obtained by conventional edge detection operators.< >

关键词： Computational modeling Layout Brain modeling Feedback loop image edge detection communications technology Laboratories Nervous system Hospitals Kernel

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OPSSA: A Media-Aware Scheduling Algorithm for Scalable Video Streaming over Simultaneous Paths in NEMO-Based Mobile Networks

OPSSA: A Media-Aware Scheduling Algorithm for Scalable Video...

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IEEE conference on Vehicular Technology (VTC)

作者： James Nightingale Qi Wang Christos Grecos Audio Visual Communications & Networks Group School of Computing University of the West of Scotland Paisley UK

There has been a significant amount of recent research in the computer networking community on the emerging wireless networking paradigm known as Mobile Networks; while the real-time image processing community have expended much effort on the development of scalable video encoding techniques and investigating the multipath streaming of real-time multimedia content. This work draws together the key elements of recent research in each of these areas and proposes a novel scheme for the multipath delivery of scalable video streams to users within multihomed mobile networks. We provide a hardware-based, multihomed mobile networks testbed and propose OPSSA, an optimised path selection and scheduling algorithm for use in multihomed mobile networks. Experimental results show our algorithm to outperform the representative algorithms when measured using the Peak Signal to Noise Ratio (PSNR) metric.

关键词： Switches Mobile communication Mobile computing Streaming media Delay Static VAr compensators Bandwidth

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ASIC design of a progressive vector quantizer

ASIC design of a progressive vector quantizer

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MILCOM, Military communications conference

作者： G.A. Rasche K.S. Thyagarajan K. Bakhru Cubic Defense Systems San Diego State University USA

The authors describe the architecture of a real-time progressive full-search vector quantizer (VQ) suitable for VLSI implementation. Because of the large memory and ALU requirements of a single VQ, the compression is performed in stages. Each stage generates a codebook index, a difference vector, and total pixel error squared. The encoder chip is partitioned into master/slave portions dividing the codebooks and computational requirements between the two ASICs (application-specific integrated circuits). Because the system is modular, several encoder stages can be cascaded to achieve a higher-quality reconstruction. The VQ is progressive in the sense that each additional stage of encoding produces better visual quality. The authors also describe the architecture of a completion chip which can be used in conjunction with several encoders to realize a single VQ.< >

关键词： Application specific integrated circuits Video compression Decoding image reconstruction Data compression Computer architecture Bandwidth Compression algorithms Digital signal processing Real time systems

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Multi-kernel Co-SVM with a new strategy using unlabeled data for image retrieval

Multi-kernel Co-SVM with a new strategy using unlabeled data...

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International conference on Pervasive Computing and Applications (ICPCA)

作者： Li Zongmin Liu Yang Li Hua School of Computer and Communications Engineering China University of Petroleum Shandong China Key Laboratory Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781457702099

Relevance feedback based on SVM classifier shows a good performance recently but the finite feedback counts limited by user's patience and the small sample size problem are not solved well, Co-SVM does a good job in solving these problems but still has some flaws. We propose three strategies to try to improve this algorithm: (1) different kernel functions are used to characterize the color and texture visual similarities; (2) a new method is proposed to caculate the confident scores of the contention samples; (3) a bunch of the most irrelevant images with the highest confident score are added into the labeled images to extend the size of labeled data while choosing a bunch of images for user labeling. Experimental results verify the superiority of our method over Co-SVM.

关键词： Support vector machines Multimedia communication Classification algorithms

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Cognitive Load Reduction on Multimedia E-Learning Materials

Cognitive Load Reduction on Multimedia E-Learning Materials

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International conference on Advanced Learning Technologies (ICALT)

作者： Masahiro Ando Maomi Ueno Graduate School of Information Systems University of Electro-Communications Japan

ISBN: (纸本)9780769531670

In e-learning area, the content development method is one of the most important research topics. This paper proposes a presentation method of visual contents (a text, a still image) in synchronization with narration (sound content) and a pointer to make the efficiency of the resource allocation of cognitive memory capacity increase, and make the transmitted amount of information maximize, based on a human's cognitive-information-processing model "dual channel model." Under various contents presentation environment {(1)narration, (2) text (with narration / without narration), (3) still images, (4) still images + text (with narration / without narration), (5) video, and (6) video + text} in e-learning, we performed some control experiments (measure the point of fixation for e-learning students by an eye mark recorder, memorization and a contents understanding test and the questionnaire) with or without pointer. The results showed the validity of this model and the effectiveness of the proposed content development method in e-learning.

关键词： Electronic learning Cognitive science Resource management Performance evaluation Humans Multimedia systems Information systems Psychology Materials testing Auditory system

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DSP hardware implementation of transform-based compression algorithm for AUV telemetry

DSP hardware implementation of transform-based compression a...

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OCEANS

作者： D.M. Kocak F.M. Caimi Department of Electrical and Software Engineering Harbor Branch Oceanographic Institution Inc. Fort Pierce FL USA

Operation of AUVs or other platforms that rely upon robust communications for navigation and mission critical tasks is facilitated by the use of on-board data compression. Data compression eliminates redundancy of transmitted information and therefore improves the efficiency of the entire mission. In some applications, acoustic and non-acoustic sensor information is acquired and processed to produce a visual representation for ease of human-in-the-loop analysis and interpretation. Many image and data compression methods are currently in development. Emphasis has been placed on achieving high efficiency as characterized by compression ratio while retaining the least error between the original image and the compressed image. Although some algorithms produce excellent results, computational complexity, and hence speed of compression or decompression, can become a limiting factor in real-time use depending upon the capability of the on-board processor. This paper describes the implementation of a high performance image compression transform using a dedicated DSP processor and supporting computer host. The system architecture and strategy for efficient code implementation are described. Example performance measures are presented for non-acoustic undersea studies. Future plans and developments for specialized applications are also discussed.

关键词： Digital signal processing Hardware image coding Data compression Robustness Navigation Mission critical systems Redundancy Acoustic applications Sensor phenomena and characterization

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Eye Movement Analysis using Virtual Reality in Early Detection of Alzheimer’s Disease

Eye Movement Analysis using Virtual Reality in Early Detecti...

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image processing, Computer Vision and Machine Learning (ICICML), International conference on

作者： Haiwei Zuo King Hann Lim Eswaran Sivaraman Jonathan Then Sien Phang Shenzhen City Polytechnic School of Information and Communications Technology Curtin Malaysia Research Institute Curtin University Malaysia

ISBN: (数字)9798350355413

ISBN: (纸本)9798350355420

Early detection of Alzheimer’s disease (AD) is important at the initial stage to provide prior treatment and control. In traditional diagnostic methods, medical doctors perform manual AD checking by asking patients to repeat several round of text reading and game exercises. The quantification of this manual assessment can be subjective due to the profession experience and it requires a further verification using the brain imaging. In this paper, an automated digital AD assessment method using Virtual Reality (VR) console is proposed to evaluate patient’s condition by tracking their eye movement during text reading. First, the eye movement pattern is captured using VR console during text reading. The recorded eye movement is then converted into frequency domain to study its frequency components during reading process. The simulation of AD symptom is set up by prompting subjects to read their familiar native language and unfamiliar language. As a result, the experiment shows that there are significant differences in eye movement patterns between native and unfamiliar language reading. The group of subjects reading unfamiliar language have random eye movement in less efficient visual processing. This pattern is similar to the patients who suffer in the AD symptom. In addition, the frequency features are extracted to study its correlations with reading comprehension performance in order to detect the early AD condition.

关键词： visualization Correlation Tracking Frequency-domain analysis Virtual reality Manuals Frequency conversion Feature extraction Alzheimer's disease Medical diagnostic imaging

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Adaptive compensation of even-order distortion in direct conversion receivers

Adaptive compensation of even-order distortion in direct con...

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IEEE conference on Vehicular Technology (VTC)

作者： Hsing-Hung Chen Po-Chiun Huang Chao-Kai Wen Jiunn-Tsair Chen Mobile Communication Lab Institute of Communications Engineering National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)0780379543

Even-order distortion is a severe problem in a direct-conversion receiver. In this paper, we look into the problem of how the even-order distortion is generated in a direct conversion receiver, and then provide a way to compensate for it. The inherent problem of even-order distortion can either be solved by employing only the radio frequency (RF) components with higher second-order input intercept point (IIP2) in the direct-conversion receiver, or by adopting some kind of DSP-assisted distortion compensation. The proposed technique goes for the latter and uses the even-order distortion signal of a low noise amplifier (LNA) as the reference signal to cancel the the even-order distortion of the direct-conversion receiver. This approach enjoys the advantages of: 1) no training sequence is needed; and 2) low complexity. The performance improvement of the direct-conversion receiver brought about by the proposed technique is demonstrated through computer simulation.

关键词： Radio frequency Receivers RF signals Digital signal processing Filters Mobile communication Distortion Radiofrequency amplifiers Costs image converters

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Base surface definition for morphotometry of the ear in phantoms of human heads

Base surface definition for morphotometry of the ear in phan...

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

作者： J.M. Flores I. Bloch F. Schmitt Image and Vision Laboratory CCADET UNAM Mexico TSI Department Ecole Nationale Supérieure des TéIécommunications Paris France

To assess ear thickness and other features of human heads, we defined a reference surface that interpolates the head shape in the region of interest. Laser-scan acquisitions were obtained from real human heads and processed for the construction of anthropomorphical phantoms, originally used for dosimetry studies of hand-held mobile phones. Raw data was converted to cylindrical range images and several image processing techniques were then applied for 3D-model construction. A triangulated surface was then obtained for rendering, and for CAD and finite-element simulations. The ear region was then isolated and replaced by a Coons patch surface that interpolates the skull, using the range-image information around the ear. A baseline surface was thus defined, useful for measuring features of human heads; in particular, an average thickness of the ear was estimated on 41 individuals. Head models "with" or "without" ears were then built for assessing dosimetry and anthropometry problems.

关键词： Ear Imaging phantoms Humans Head Dosimetry Anthropometry Shape Anthropomorphism Mobile handsets image converters

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A review paper on diagnosis of approximal and occlusal dental caries using digital processing of medical images

A review paper on diagnosis of approximal and occlusal denta...

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International conference on Emerging Trends in Electrical Electronics & Sustainable Energy Systems (ICETEESES)

作者： Raghav Agarwal Abhay Kumar Agrawal Harsh Vikram Singh Sonam Tyagi Electronics Engineering Department Kamla Nehru Institute of Technology Sultanpur India Computer Science Engineering Department Kamla Nehru Institute of Technology Sultanpur India

Diagnosis of Approximal and Occlusal caries is a difficult process in the clinical setting, because of the edge line in the Approximal surfaces is not so clear and also the complicated setting of pits and fissures in the Occlusal surface. Detection of these two types of dental caries can be carried out using two processes (1.) Carious legion has to be identified (2.) We have to assess the depth and the percentage of its activity in the mouth. Basically, caries at first is detected through visual inspection but it is not sufficient and also it is not periodic since lots of subjective parameters are involved and also the experience of the doctor plays a key role in this process. For the same problem there can be difference in the opinion between the doctors which directly affect the treatment process. Therefore this work aims on using certain parameters included in one algorithm which will refine the image taken and process it. Comparing that image with previous image will give the reasons that why there are the differences in opinions among the doctors for the same image and hence a better treatment process could be used after solving this problem. The images used in this work are of DICOM (Digital Imaging and communications in Medicine) standard. It is a standard set by NEMA and is used for handling, storing, printing and transmitting all types of medical images related to different types of diseases. These images has been captured using the digital radiography technology which is widely used in clinical settings to diagnose the dental caries.

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