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International Symposium on Electronics in Marine (ELMAR)

作者： D. Heric B. Potocnik Faculty of Laboratory of Electrical Engineering and Computer Science System Software Laboratory University of Maribor Maribor Slovenia

The purpose of this paper is to introduce an novel edge detector using directional wavelet transform and signal registration. Directional wavelet transform decomposes an image into four-dimensional space which augments the image by the scale and directional information. We show the directional information significantly improves edge detection in noisy images in comparison with the classical multiscale edge detector, and enables more reliable edge tracing along an object boundary. Edge detection is based on the modulus maximum principle with an adaptive threshold whose value is calculated via maximum entropy measure. Edge tracing is done with signal alignment between neighbour edges

关键词： Image edge detection Detectors Wavelet transforms Discrete wavelet transforms Laboratories computer science system software Object detection Entropy Image registration

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Edge Relaxation in Images using Directional Hierarchical Image Decomposition

Edge Relaxation in Images using Directional Hierarchical Ima...

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Proceedings of the Nordic Signal Processing Symposium (NORSIG)

作者： Dusan Heric Bozidar Potocnik Faculty of Electrical Engineering and Computer Science System Software Laboratory University of Maribor Maribor Slovenia

This paper presents a new hierarchical method of the edge relaxation by using an edge confidence measure. Proposed method is an adaptive and based on directional hierarchical image decomposition and an edge connecting algorithm. It is shown that such combination has low sensitivity to noise, while it is highly robust to outliers, and provide a quality edge connection mechanism

关键词： Image decomposition Image edge detection Image segmentation Image processing Relaxation methods Joining processes Labeling Image analysis computer science system software

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A Low Power 16-bit RISC with Lossless Compression Accelerator for Body Sensor Network system

A Low Power 16-bit RISC with Lossless Compression Accelerato...

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IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Hyejung Kim Sungdae Choi Hoi-Jun Yoo Department of Electrical Engineering and Computer Science Semiconductor System Laboratory KAIST Daejeon South Korea

A low power 16-bit RISC is proposed for body sensor network system. The proposed IPEEP scheme provides zero overhead for the wakeup operation. The lossless compression accelerator is embedded in the RISC to support the low energy data compression. The accelerator consists of 16times16-bit storage array which has vertical and horizontal access path. By using the accelerator the energy consumption of the lossless compression operation is reduced by 93.8%. The RISC is implemented by 1-poly 6-metal 0.18 um CMOS technology with 16 k gates. It operates at 4 MHz and consumes 24.2 uW at 0.6 V supply voltage.

关键词： Reduced instruction set computing Body sensor networks Base stations Energy consumption Registers Data compression Sensor systems CMOS technology Compression algorithms Wireless sensor networks

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Image enhancement by using directional wavelet transform

Image enhancement by using directional wavelet transform

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International Conference on Information Technology Interfaces

作者： D. Heric B. Potocnik Faculty of Electrical Engineering and Computer Science System Software Laboratory University of Maribor Maribor Slovenia

The purpose of this paper is to introduce a novel image enhancement technique by using directional wavelet transform. Directional wavelet transform decomposes an image into four-dimensional space which augments the image by the scale and directional information. We show the directional information significantly improves image enhancement in noisy images in comparison with the classical techniques. Image enhancement is based on the multiscale singularity detection with an adaptive threshold whose value is calculated via maximum entropy measure. The proposed technique was tested on synthetic images at different signal-to-noise ratios and clinical images

关键词： Image enhancement Wavelet transforms Histograms Laplace equations Image processing Entropy Testing Signal to noise ratio Noise reduction Image analysis

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Single camera 3D lane detection and tracking based on EKF for urban intelligent vehicle

Single camera 3D lane detection and tracking based on EKF fo...

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IEEE International Conference on Vehicular Electronics and Safety, ICVES 2006

作者： Min, Tian Fuqiang, Liu Zhencheng, Hu IEEE Key Laboratory of Embedded System and Service Computing Ministry of Education China Electronic and Information Engineering Department Tongji University Shanghai 201804 China Department of Computer Science Kumamoto University Kumamoto 860-8555 Japan

ISBN: (纸本)1424407591

Road boundary detection and tracking is an important and integral function in advanced driver-assistance system. This paper proposes an algorithm, which can follow multi-kinds of lane, straight and curved, quickly and robustly. The algorithm uses several masks to extract blobs of road markings, combining with KNN function to remove the disturbance. Further more, road is modeled as a 3D surface, and some important parameters of current lane are provided on real-time by tracking based on Extended Kalman Filter (EKF). The results of experiments, which have been done in urban road, show that the algorithm is adapted to many road conditions. Even in a complex driving environment, it also has a good performance. © 2006 IEEE.

关键词： Extended Kalman filters

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Block-based logical hierarchical cluster for distributed multimedia architecture on demand server

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Journal of Shanghai University(English Edition) 2006年第2期10卷 127-133页

作者：熊旭辉余胜生周敬利 National Storage System Laboratory Department of Computer Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P.R. China

A structure of logical hierarchical cluster for the distributed multimedia on demand server is proposed. The architecture is mainly composed of the network topology and the resource management of all server nodes. Instead of the physical network hierarchy or the independent management hierarchy, the nodes are organized into a logically hieraxchical cluster according to the multimedia block they caches in the midderware layer. The process of a member joining/leaving or the structure adjustment cooperatively implemented by all members is concerned with decentralized maintenance of the logical cluster hierarchy. As the root of each logically hierarchical cluster is randomly mapped into the system, the logical structure of a multimedia block is dynamically expanded across some regions by the two replication policies in different load state respectively. The local load diversion is applied to fine-tune the load of nodes within a local region but belongs to different logical hierarchies. Guaranteed by the dynamic expansion of a logical structure and the load diversion of a local region, the users always select a closest idle node from the logical hierarchy under the condition of topology integration with resource management.

关键词： logical hierarchical cluster early replication instantaneous replication local load diversion constrained server selection.

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An Memory-Efficient Variable Length Decoding Scheme for Embedded MPEG-4 Video Decoders

An Memory-Efficient Variable Length Decoding Scheme for Embe...

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2006 8th International Conference on Signal Processing

作者： Hongxing Guo Xiaojian Xia Weiping Sun Jingli Zhou Shengsheng Yu Department of Computer Science and Engineering Huazhong University of Science and TechnologyDivision of Data Storage System of Wuhan National Laboratory for Optoelectronics

Variable length decoding(VLD) is inherent bit-serial operation and is the first stage of the whole video decoding task,the overall decoding system performance is determined by its throughput and ef

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Cache optimization for an embedded MPEG-4 video decoder

Cache optimization for an embedded MPEG-4 video decoder

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2006 8th International Conference on Signal Processing

作者： Hongxing Guo Tao Sheng Weiping Sun Jingli Zhou Shengsheng Yu Department of Computer Science and Engineering Huazhong University of Science and TechnologyDivision of Data Storage System of Wuhan National Laboratory for Optoelectronics

Video decoders are an important component in modern networked multimedia systems. TMS320DM642 is suitable for implementation of embedded video ***,the high data rate, large sizes,and distinctive memory access patterns of MPEG-4 video decoders exert a particular strain on *** paper proposes an optimization method to allocate the memory of *** Cache-SRAM -SDRAM structure,the SRAM negotiates the unbalance of the cache and the SDRAM in speed and *** to its importance,a cache-based memory allocation mode is proposed to make full use of the *** to this mode,the SRAM is divided into three sections:the data exchanging section,the core code and variables storage section, and the rest of the SRAM which is set as cache for the other codes and data *** experiment results show the proposed solutions can improve the MPEG-4 decoding speed by almost 25%.This cache optimization method has been integrated into the developed embedded MPEG-4 video *** decoder can perform real time decoding with bitstreams coded under two channels 4CIF or eight channels CIF frame size which is the typical requirement of networked video surveillance applications nowadays.

关键词： TMS SDRAM Cache optimization for an embedded MPEG-4 video decoder

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Resilient P2P anonymous routing by using redundancy

Resilient P2P anonymous routing by using redundancy

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International Workshop on Networking, Architecture, and Storages (IWNAS)

作者： Yingwu Zhu Department of Computer Science & Software Engineering Distributed System Laboratory (DSL) Seattle University Seattle WA USA

One hurdle to using peer-to-peer networks as anonymizing networks is churn. Node churn makes anonymous paths fragile and short-lived: failures of a relay node disrupt the path, resulting in message loss and communication failures. To make anonymous routing resilient to node failures, we use a simple yet powerful idea based on message redundancy by erasure coding and path redundancy to mask node failures. We present an allocation of erasure-coded message segments among multiple paths that provides a guideline on how to maximize routing resilience upon different node availabilities in real-world systems. Our approach allows a tradeoff between routing resilience and bandwidth usage. We show that our approach greatly improves routing resilience while only incurring a moderate bandwidth overhead

关键词： Routing Peer to peer computing Resilience Relays Multicast protocols Bandwidth Telecommunication traffic Public key Cryptography Laboratories

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Multi-rate transmissions on SAC-OCDMA system using new enhancement double-weight (EDW) codes 2

Multi-rate transmissions on SAC-OCDMA system using new enhan...

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2nd International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA 2006

作者： Hasoon, Feras N. Aljunid, S.A. Abdullah, Mohamad Khazani Shaari, Sahbudin Faculty of Information Science and Technology Multimedia Universit Melaka Malaysia Department of Computer and Communication System Faculty of Engineering University Putra Malaysia UPM Serdang43400 Malaysia Photonics Technology Laboratory Institute of Micro Engineering and Nanoelectronics Universiti Kebangsaan Malaysia UKM Bangi Selangor43600 Malaysia

ISBN: (纸本)0780395212

This paper presents a new code structure and its ability in supporting multiple transmission rates in point to point Spectral Amplitude Coding- Optical Code Division Multiple Access (SAC-OCDMA) links. The Double-Weight (DW) code family that has a basic fixed weight of 2 was proposed. Enhancement Double Weight (EDW) Code is a DW code family variation that has variable weight of greater than one. The ability of EDW codes to support simultaneous transmissions at different bit rates is shown through simulated results of the bit error rate (BER) and the eye patterns. Three EDW encoded channels were used at the bit rates of 2.5Gbps and 10Gbps. EDW code shown here significantly performs better than Hadamard and Modified Frequency Hopping (MFH) codes. © 2006 IEEE.

关键词： Bit error rate

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