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Conference on Real-Time image processing 2006

作者： Wu, Yunsong Megson, Graham Univ Reading Sch Syst Engn Reading RG6 6AA Berks England

ISBN: (纸本)0819461032

This paper presents an improved parallel Two-Pass Hexagonal (TPA) algorithm constituted by Linear Hashtable Motion Estimation Algorithm (LHMEA) and Hexagonal Search (HEXBS) for motion estimation. Motion Vectors (MV) are generated from the first-pass LHMEA and used as predictors for second-pass HEXBS motion estimation, which only searches a small number of Macroblocks (MBs). We used bashtable into video processing and completed parallel implementation. The hashtable structure of LHMEA is improved compared to the original TPA and LHMEA. We propose and evaluate parallel implementations of the LHMEA of TPA on clusters of workstations for real time video compression. The implementation contains spatial and temporal approaches. The performance of the algorithm is evaluated by using standard video sequences and the results are compared to current algorithms.

关键词： image processing parallel image processing hashtable two pass hexagonal search

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Real-time efficient parallel thermal and visual face recognition fusion

Real-time efficient parallel thermal and visual face recogni...

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6th IEEE International Conference on Electro/Information Technology (EIT 2006)

作者： Ali, Usman Taj, Jahanzeb Ahmad Hussain, Talib Hussain, Mazhar COMSATS Inst Informat Technol Abbottabad Pakistan

ISBN: (纸本)9780780395930

parallel architecture for fast and efficient visual and thermal face recognition fusion biometric system is presented in this paper. Almost all the decision fusion techniques, in the literature, are computationally expensive. Gabor filter technique is used for recognition of features from input image and the database images. As Gabor filter itself has high computational requirements, so we have proposed a parallel solution, which is fast and efficient. Paper also discusses the performance issues of cluster computing based parallel face recognition along with its limitations and benefits.

关键词： Gabor filter parallel image processing cluster computing decision fusion face recognition

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Video based parallel Face recognition using Gabor filter on homogeneous distributed systems

Video based Parallel Face recognition using Gabor filter on ...

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IEEE International Conference on Engineering of Intelligent Systems

作者： Ali, Usman Bilal, Muhammad Muhammad Ali Jinnah Univ Islamabad Campus Islamabad Pakistan COMSATS Inst Informat Technol Abbottabad Pakistan

ISBN: (纸本)9781424404568

This research aimed at building a fast video, parallel face recognition system based on the well known Gabor filtering approach. Face recognition is done after face detection in each frame of the video, individually. The master-slave technique is employed as the parallel computing model. Each frame is processed by different slave Personal Computers (PC) attached to the master, which acquire and distribute frames. It is believed that this approach can be used for practical face recognition applications with some further optimization.

关键词： gabor filter parallel image processing cluster computing video based face recognition

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A CMOS image sensor with programmable pixel-level analog processing

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IEEE TRANSACTIONS ON NEURAL NETWORKS 2005年第6期16卷 1673-1684页

作者： Massari, N Gottardi, M Gonzo, L Stoppa, D Simoni, A Ctr Ric Sci & Tecnol I-38050 Povo TN Italy

A prototype of a 34 x 34 pixel image sensor, implementing real-time analog image processing, is presented. Edge detection, motion detection, image amplification, and dynamic-range boosting are executed at pixel level by means of a highly interconnected pixel architecture based on the absolute value of the difference among neighbor pixels. The analog operations are performed over a kernel of 3 x 3 pixels. The square pixel, consisting of 30 transistors, has a pitch of 35 mu m with a fill-factor of 20%. The chip was fabricated in a 0.35 mu m CMOS technology, and its power consumption is 6 mW with 3.3 V power supply. The device was fully characterized and achieves a dynamic range of 50 dB with a light power density of 150 nW/mm(2) and a frame rate of 30 frame/s. The measured fixed pattern noise corresponds to 1.1% of the saturation level. The sensor's dynamic range can be extended up to 96 dB using the double-sampling technique.

关键词： active pixel sensors analog processing circuits CMOS vision sensors parallel image processing switched capacitor circuits

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One long argument: Azriel Rosenfeld and the genesis of modern image systems

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PATTERN RECOGNITION LETTERS 2005年第3期26卷 277-285页

作者： Cantoni, V Levialdi, S Univ Roma La Sapienza Dept Informat Rome Italy Univ Pavia Dipartimento Informat & Sistemist I-27100 Pavia Italy

We present our vision on the history of multiprocessor architectures for image processing seen under the light of Darwin's Theory of Evolution, remembering our fruitful and entertaining scientific meetings with Professor Azriel Rosenfeld along the nearly 30 years of our acquaintance. We experienced the blooming of novel systems (70s and 80s), the harvesting of such systems (90s) and later, the extinction of the massively parallel systems in favor of the adoption of large clusters of fast commercial processors to accomplish the same image processing tasks. (C) 2004 Published by Elsevier B.V.

关键词： parallel image processing computer vision architectures multiprocessor systems evolution natural selection

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Two-pass hexagonal algorithm with parallel implementation for video coding

Two-pass hexagonal algorithm with parallel implementation fo...

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International Conference on Computer as a Tool (EUROCON 2005)

作者： Wu, YS Megson, G Univ Reading Sch Syst Engn Reading RG6 2AH Berks England

ISBN: (纸本)142440049X

This paper presents a paralleled Two-Pass Hexagonal (TPA) algorithm constituted by Linear Hashtable Motion Estimation Algorithm (LHMEA) and Hexagonal Search (HEXBS) for motion estimation. In the TPA, Motion Vectors (MV) are generated from the first-pass LHMEA and are used as predictors for second-pass HEXBS motion estimation, which only searches a small number of Macroblocks (MBs). We introduced hashtable into video processing and completed parallel implementation. We propose and evaluate parallel implementations of the LHMEA of TPA on clusters of workstations for real time video compression. It discusses how parallel video coding on load balanced multiprocessor systems can help, especially on motion estimation. The effect of load balancing for improved performance is discussed. The performance of the algorithm is evaluated by using standard video sequences and the results are compared to current algorithms.

关键词： parallel image processing video compression parallel computing motion estimation

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A highly scalable interconnection network for parallel image processing

A highly scalable interconnection network for parallel image...

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Conference on Neural Network and Distributed processing

作者： Wang, HY Gu, WK Zhejiang Univ Dept Informat & Elect Engn Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)0819442836

In this paper, we introduce a new hierarchical interconnection network for massively parallel systems, named Fully Connected Cubic Network (FCCN). FCCN is able to emulate the popular Hypercube. FCCN has a constant nodal degree of 4 and it therefore eliminates the problem of large fanout in Hypercube. Moreover, the constant degree is an important requirement for efficiently fabricating an architecture in parallel image processing. FCCN is also a highly scalable architecture in that the existing links remain intact when new nodes are introduced. FCCN is maximally fault tolerant and it enjoys reasonably low diameter, growth of the number of links and average internodal distance. At last, FCCN is used for parallel image processing system for interconnection. The computation results show that FCCN is a high efficient interconnection network for parallel image processing.

关键词： Fully Connected Cubic Network(FCCN) interconnection network(IN) self-routing algorithm parallel image processing

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An immune oriented multi-agent system for biological image processing

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PATTERN RECOGNITION 2004年第4期37卷 631-645页

作者： Rodin, V Benzinou, A Guillaud, A Ballet, P Harrouet, F Tisseau, J Le Bihan, J Technopole Brest Iroise Ecole Natl Ingn Brest F-29238 Brest 3 France

In this article, we present a parallel image processing system based on the concept of reactive agents. Our system lies in the oRis language, which allows to describe finely and simply the agents' behaviors to detect image features. We also present a method of segmentation using a multi-agent system, and two biological applications made with oRis. The stopping of this multi-agent system is implemented through a technique issued from immunology: the apoptosis. (C) 2003 Pattern Recognition Society. Published by Elsevier Ltd. All rights reserved.

关键词： artificial immune systems multi-agent language multi-agent system parallel image processing spots detection striae detection

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A fully parallel CMOS analog median filter

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2004年第3期51卷 116-123页

作者： Díaz-Sánchez, A Ramírez-Angulo, J Lopez-Martin, A Sánchez-Sinencio, E Natl Inst Astrophys Opt & Elect Dept Elect Puebla 72840 Mexico New Mexico State Univ Klipsch Sch Elect & Comp Engn Las Cruces NM 88003 USA Publ Univ Navarra Dept Elect & Elect Engn E-31006 Pamplona Spain Texas A&M Univ Dept Elect Engn College Stn TX 77843 USA

A fully integrated CMOS implementation of a continuous-time analog median filter is presented. The median filter uses two compact analog circuits as building blocks to implement the variable delay and median detection. Median detectors are based on current saturating transconductance comparators, while the time delay is implemented using first-order all-pass filters. Both circuits allow modular expansion for the implementation of large median filter array processors. Based on these blocks, a new fast technique for parallel image processing is presented. It is shown that an image of 91 x 80 pixels can be processed in less than 8 mus using an array of median filter cells. Experimental results of a test chip prototype in 2-mum CMOS MOSIS technology are presented.

关键词： analog delay cells analog median filter CMOS analog circuits parallel image processing transconductance comparators

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High-speed data position detection method using template matching for hologram memory

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 2004年第7A期43卷 4216-4220页

作者： Motoyama, T Sugiyama, Y Ooue, N Yamamoto, M Endo, M Tanabe, T Sci Univ Tokyo Grad Sch Ind Sci & Technol Noda Chiba 2788510 Japan NTT Corp NTT Cyber Space Labs Musashino Tokyo 1808585 Japan

Two-dimensional digital image reproduction in a hologram memory causes incorrect decoding due to image distortion. In order to correct image distortion, the position coordinates of the four corners of the reproduced image are detected by template matching. However, much position detection processing time is required in this signal processing method. In this study, after having used both parallel processing that combines the marker-dividing approach and marker detection image-dividing approach in the hardware detecting process, and the redundant calculation elimination method and brightness totaling method in the software detection process, it is clarified that an increase in the speed of 260-fold could be obtained as compared with the conventional template matching process.

关键词： hologram memory template matching image processing parallel image processing vhdl

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