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检索条件"任意字段=2017 Conference on Design and Architectures for Signal and Image Processing, DASIP 2017"

共 891 条记录，以下是191-200 订阅

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A Spectral Graph Based image Coding Method 25

A Spectral Graph Based Image Coding Method

引用

25th signal processing and Communications Applications conference (SIU)

作者： Yagan, Ali Cart Ozgen, Melanaet Tonkin Anadolu Univ Elekt Elekt Muhendisligi Bolumu Eskisehir Turkey

ISBN: (纸本)9781509064946

In this paper, a spectral graph based image coding method is proposed. In the proposed method, only the smoothing parameter in the graph adjacency matrix, graph Fourier transform (GFT) coefficients kept after hard thresholding and column indices of eigenvectors corresponding to kept coefficients are sent to the decoder side. It is advantageous in that this coding process is performed by sending much less information as compared to other graph based methods. Our results indicate that our proposed method enables image compression without deteriorating the visual quality by using very small numbers of GFT coefficients.

关键词： signal processing on graphs graph Fourier transform image coding

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Hardware design and Analysis of Efficient Loop Coarsening and Border Handling for image processing 28

Hardware Design and Analysis of Efficient Loop Coarsening an...

引用

28th IEEE International conference on Application-specific Systems, architectures and Processors (ASAP)

作者： Oezkan, M. Akif Reiche, Oliver Hannig, Frank Teich, Juergen Friedrich Alexander Univ Erlangen Nurnberg FAU Dept Comp Sci Hardware Software Codesign Erlangen Germany

ISBN: (纸本)9781509048250

Field Programmable Gate Arrays (FPGAs) excel at the implementation of local operators in terms of throughput per energy since the off-chip communication can be reduced with an application-specific on-chip memory configuration. Furthermore, data-level parallelism can efficiently be exploited through so-called loop coarsening, which processes multiple horizontal pixels simultaneously. Moreover, existing solutions for proper border handling in hardware show considerable resource overheads. In this paper, we first propose novel architectures for image border handling and loop coarsening, which can significantly reduce area. Second, we present a systematic analysis of these architectures including the formulation of analytical models for their area usage. Based on these models, we provide an algorithm for suggesting the most efficient hardware architecture for a given specification. Finally, we evaluate several implementations of our proposed architectures obtained through Vivado High-Level Synthesis (HLS). The synthesis results show that the proposed coarsening architecture uses 32% less registers for a 5-by-5 convolution with a 64 coarsening factor compared to previous works, whereas the proposed border handling architectures facilitate a decrease in the Look-up Table (LUT) usage by 36 %.

关键词： Registers Computer architecture Schedules Hardware Field programmable gate arrays Throughput image processing

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A VHDL Based Moore and Mealy FSM Example for Education 2

A VHDL Based Moore and Mealy FSM Example for Education

引用

2nd IEEE International conference on signal and image processing (ICSIP)

作者： Alsubaei, Sultana Qaisar, S. M. Alhalabi, W. Effat Univ Elect & Comp Engn Dept Jeddah Saudi Arabia Effat Univ Dept Comp Sci Jeddah Saudi Arabia

ISBN: (纸本)9781538609699

With recent technological advancements, modern societies are becoming more and more dependent on the automated machines. It is in order to cope with their fast-going lives. Modern automated machines adapt their sequence of actions depending on their environment and events. The FSM (Finite state machine) is used to mathematically express those sequences of actions or instructions. In this article two FSM machines types, Moore and Mealy, are discussed. Showing different results in order to demonstrate the importance of FSM modeling. An edge detector circuit is designed by employing both Moore and Mealy machines. It is a FSM design example, can be used for students concepts building and demonstration. These designs are implemented in VHDL. A comparison is also made based on both implementations.

关键词： FSM automation VHDL Xilinx-ISE timing diagram computer aided design

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Dictionary design and disparity interpolation on distributed compressed sensing for light field image 9

Dictionary design and disparity interpolation on distributed...

引用

9th Annual Summit and conference of the Asia-Pacific-signal-and-Information-processing-Association (APSIPA ASC)

作者： Akiyoshi, Yusaku Sumi, Taichi Kuroki, Yoshimitsu Kurume Coll Natl Inst Technol Komorino 1-1-1 Kurume Fukuoka 8308555 Japan

ISBN: (纸本)9781538615423

This paper discusses two terms of distributed compressed sensing for multi-view point images generated with a light field camera. Our first discussion is on the performance of dictionary designed with ADMM (Alternating Direction Method of Multipliers) and that of K-SVD since reconstructed image quality depends on the dictionary. The second discussion is disparity interpolation of non-key frames. The interpolation accuracy contributes to reconstructed image quality and effective dictionary design. Then, this paper compares three disparity interpolation methods: the overlapped block matching, the conventional optical flow, and the TVL1-optical-flow. Experimental results show that the dictionary design with ADMM is faster than that with K-SVD whereas PSNR values using ADMM are slightly lower than those of K-SVD, and the TVL1-optical flow is the fastest holding the highest PSNR values.

关键词： Dictionaries Interpolation Convex functions Optical imaging Lenses Cameras Discrete cosine transforms

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design and Implementation of a Digital Code Lock Demonstrator for Education 2

Design and Implementation of a Digital Code Lock Demonstrato...

引用

2nd IEEE International conference on signal and image processing (ICSIP)

作者： Alfageh, Alyah Qaisar, S. M. Alyousef, Afnan Alsubaei, Sultan Effat Univ Elect & Comp Engn Dept Jeddah Saudi Arabia

ISBN: (纸本)9781538609699

The security is key concern in our daily life. A key protected access control module is an elementary part of all security systems. It allows only the authorized people to enter into a restricted zone. This work focuses on the design and development of a digital code lock system with display for students demonstration purpose. Being designed for illustration purpose, the system has easily accessible inputs and outputs to each module. In order to keep the system cost effective with an ease of reimplementation. The low cost and easily market available discrete analog components are employed. The digital part is kept configurable with the help of a microcontroller based implementation. It allows an easy alteration of the master code in order to improvethe system security. The digital module implementation is done via C language. The system implementation is described. Testing results are also presented. These results assure a proper functionality of the designed system.

关键词： C language digital key microcontroller ASM computer aided design

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New Pilot Allocation design Schemes for Sparse Channel Estimation in OFDM System 5

New Pilot Allocation Design Schemes for Sparse Channel Estim...

引用

IEEE International conference on signal and image processing Applications (ICSIPA)

作者： Uwaechia, Anthony Ngozichukwuka Mahyuddin, Nor Muzlifah Univ Sains Malaysia Sch Elect & Elect Engn Nibong Tebal 14300 Malaysia

ISBN: (纸本)9781509055593

In this paper, the problem of the deterministic pilot allocation for sparse channel estimation in Orthogonal Frequency Division Multiplexing (OFDM) system is investigated. This method is based on mutual coherence minimization of the measurement matrix associated with the OFDM system pilot subcarriers. It is known that if the set of pilot pattern is a Cyclic Difference Set (CDS), the mutual coherence of the measurement matrix is minimized. However, CDS in most practical OFDM system is not available. Few research efforts have tackled the problem of pilot allocation by proposing methods that lead to suboptimal solutions in order to ignore the computationally complex exhaustive search method. This contribution, however, proposes two pilot allocation design schemes for the construction of deterministic partial Fourier matrices satisfying the Restricted Isometry Property (RIP) namely, the Generic Random Search (GRS) and Progressive Search (PS) based on bounding the mutual coherence between different columns of the measurement matrix. Simulation results show that the two proposed pilot allocation design schemes are effective and offer a better channel estimation performance in terms of MSE when compared to former pilot allocation design methods.

关键词： OFDM Resource management Coherence Channel estimation Minimization Sparse matrices Algorithm design and analysis

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SCALED FIXED-POINT FREQUENCY SELECTIVE EXTRAPOLATION FOR FAST image ERROR CONCEALMENT 24

SCALED FIXED-POINT FREQUENCY SELECTIVE EXTRAPOLATION FOR FAS...

引用

24th IEEE International conference on image processing (ICIP)

作者： Genser, Nils Seiler, Juergen Kaup, Andre Friedrich Alexander Univ Erlangen Nurnberg FAU Multimedia Commun & Signal Proc Cauerstr 7 D-91058 Erlangen Germany

ISBN: (纸本)9781509021758

image and video signal processing demands in many areas for error concealment algorithms, whereby the execution time plays an important role. Within this paper, we introduce the scaled fixed-point Frequency Selective Extrapolation for fast image error concealment. This algorithm is based on the complex-valued Frequency Selective Extrapolation, but reduces computational complexity. It is shown that a fixed-point realization of the state-of-the-art algorithm requires an impracticable word-length, which makes it necessary to design a novel, scaled Frequency Selective Extrapolation that reduces the required word-length. Regarding the new approach, execution time can be reduced on average by 22.84 % and at best by up to 40.45 % compared to the state-of-the-art floating point Frequency Selective Extrapolation at the same reconstruction quality. Moreover, platforms can be exploited, which support fixed-point arithmetic only.

关键词： Error Concealment Inpainting signal Extrapolation

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Grafik Processor Accelerated Real Time Software Defined Radio Applications 25

Grafik Processor Accelerated Real Time Software Defined Radi...

引用

25th signal processing and Communications Applications conference (SIU)

作者： Fisne, Alparslan Ozsoy, Adnan ASELSAN AS REHIS EHGYM Bolumu Ankara Turkey Hacettepe Univ Bilgisayar Bilimleri Muhendisligi Bolumu Ankara Turkey

ISBN: (纸本)9781509064946

This paper presents optimizations for spectrogram matrix and signal detection processes which are used for signal sensing in software defined radio (SDR) applications. In industrial and literature applications, the software defined radio or software based receivers include field programmable gate array (FPGA) and digital signal processors (DSP) units for real time signal processing steps. In this study, it is performed real time signal sensing due to using CPU, providing four times speedup compared to multicore CPU which works at same platform. The other important result of our study is making SDR applications at real-time with mobile a computer instead of complex receiver architectures with high cost.

关键词： SDR GPU spectrum signal detection

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Compression of Medical image using Wavelet based Sparsification and Coding 4

Compression of Medical Image using Wavelet based Sparsificat...

引用

4th International conference on signal processing and Integrated Networks (SPIN)

作者： Patbhajel, Utpreksh Kumar, Ranjeet Kumar, A. Lee, H. -N. PDPM Indian Inst Informat Technol Design & Mfg Elect & Commun Engn Jabalpur 482005 MP India Gwangju Inst Sci & Technol Sch Elect & Comp Sci Gwangju 500712 South Korea

ISBN: (纸本)9781509027972

In this paper, medical image compression technique is presented based on adaptive Scan Wavelet Difference Reduction (ASWDR). It helps to save the storage space and transmission bandwidth of tele-healthcare system. The presented compression scheme has evaluated for different ultrasound image of different cases. The ASWDR technique is exploited with different wavelet filters and obtained the different efficiency of compression as per distinctive sparse characteristics. However, the performance of presented compression scheme is evaluated with fidelity assessments as well as human vision perception for compression and reconstruction. As seen the results, compression of the image is obtained up to 45:1 with 99% of structural similarity of the original and compressed image.

关键词： image Compression WDR Wavelets Big Data

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design and Analysis of a Microstrip Antenna Array for Biomedical Applications 3

Design and Analysis of a Microstrip Antenna Array for Biomed...

引用

3rd International conference on Advanced Technologies for signal and image processing (ATSIP)

作者： Ouerghi, K. Smida, A. Ghayoula, R. Boulejfen, N. Tunis El Manar Univ Fac Math Phys & Nat Sci Tunis Unit Res High Frequency Elect Circuits & Syst Tunis Tunisia Res Ctr Microelect & Nanotechnol Technopole Sousse Sousse 4050 Tunisia

ISBN: (纸本)9781538605516

Breast cancer affects many women all over the globe and means for early detection are necessary for fast and effective treatment. Mammography, which is currently the most popular method of breast screening, has some limitations and microwave imaging seems to offer a good alternative. In this paper, a study of patch antenna array for breast cancer detection is presented. The results show that the proposed antenna's design is capable of detecting the breast tumor with much improved characteristics compared to the other designs available in the literature. The capabilities and limitations of this antenna for detecting tumor models are investigated through simulations and its potential for detecting tumors in the breast is highlighted

关键词： Breast Cancer Detection Patch Antenna Antenna array

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