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检索条件"任意字段=Architectures and Algorithms for Digital Image Processing II 1985"

共 76 条记录，以下是61-70 订阅

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Jacobi-like method for a control algorithm in adaptive-optics imaging

Jacobi-like method for a control algorithm in adaptive-optic...

引用

SPIE Conference on Advanced Signal processing algorithms, architectures, and Implementations ViiI

作者： Pitsianis, NP Ellerbroek, BL Van Loan, C Plemmons, RJ BOPS Inc Chapel Hill NC 27514 USA

ISBN: (纸本)0819429163

A study is made of a non-smooth optimization problem arising in adaptive-optics, which involves the real-time control of a deformable mirror designed to compensate for atmospheric turbulence and other dynamic image degradation factors. One formulation of this problem yields a functional f(U) = Sigma(i=1)(n) max(j){((UMjU)-M-T)(ii)} to be maximized over orthogonal matrices U for a fixed collection of n x n symmetric matrices Mj. We consider first the situation which can arise in practical applications where the matrices M-j are "nearly" pairwise commutative. Besides giving useful bounds, results for this case lead to a simple corollary providing a theoretical closed-form solution for globally maximizing f if the Mj are simultaneously diagonalizable. However, even here conventional optimization methods for maximizing f are not practical in a real-time environment. The general optimization problem is quite difficult and is approached using a heuristic Jacobi-like algorithm. Numerical tests indicate that the algorithm provides an effective means to optimize performance for some important adaptive-optics systems.

关键词： Matrices Adaptive optics Optimization (mathematics) Atmospheric turbulence Silicon Optical filters Adaptive control digital filtering Telescopes Deformable mirrors

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image Encryption Based on Chen Chaotic System, OpenSSL S-Box and the Fibonacci Q-Matrix 27

Image Encryption Based on Chen Chaotic System, OpenSSL S-Box...

引用

27th IEEE Signal processing: algorithms, architectures, Arrangements, and Applications, SPA 2024

作者： Lotfy, Rana Gabr, Mohamed Mamdouh, Eyad Aboshousha, Amr Alexan, Wassim El-Damak, Dina Fathy, Abdallah Mansour, Marvy Badr Monir German University in Cairo Faculty of MET Cairo Egypt German University in Cairo Physics Department Cairo Egypt German University in Cairo Faculty of IET Cairo Egypt ElSewedy University of Technology - Polytechnic of Egypt Faculty of Engineering Technology Department of Electronic Engineering Technology Cairo Egypt The British University in Egypt Faculty of Engineering Department of Electrical Engineering Cairo Egypt

ISBN: (纸本)9788362065486

This paper presents a novel image encryption algorithm that leverages the chaotic properties of the Chen system, the cryptographic strength of OpenSSL, and the mathematical robustness of the Fibonacci Q-Matrix. The proposed method begins by generating an encryption key using the Chen chaotic system, known for its sensitivity to initial conditions and complex dynamic behavior. This key is then utilized in conjunction with a substitution box (S box) generated through OpenSSL to introduce non-linearity and diffusion into the encryption process. To further enhance security, the resulting image data undergoes a series of multiplications by a large number of Fibonacci Q-Matrices, exploiting their recursive properties for added complexity and confusion. Numerical results demonstrate the proposed algorithm's superior performance in terms of security and efficiency, making it a promising solution for safeguarding digital images against unauthorized access and cryptographic attacks. © 2024 Division of Signal processing and Electronic Systems, Poznan University of Technology (DSPES PUT).

关键词： Encryption algorithms

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ACE16k based stand-alone system for real-time pre-processing tasks

ACE16k based stand-alone system for real-time pre-processing...

引用

Conference on VLSI Circuits and Systems ii

作者： Carranza, L Jiménez-Garrido, F Liñán-Cembrano, G Roca, E Meana, SE Rodríguez-Vázquez, A CSIC CNM Inst Microelect Sevilla Seville 41012 Spain

ISBN: (纸本)0819458325

This paper describes the design of a programmable stand-alone system for real time vision pre-processing tasks. The system's architecture has been implemented and tested using an ACE16k chip and a Xilinx xc4028xl FPGA. The ACE16k chip consists basically of an array of 128x128 identical mixed-signal processing units, locally interacting, which operate in accordance with single instruction multiple data (SIMD) computing architectures and has been designed for high speed image pre-processing tasks requiring moderate accuracy levels (7 bits). The input images are acquired using the optical input capabilities of the ACE16k chip, and after being processed according to a programmed algorithm, the images are represented at real time on a TFT screen. The system is designed to store and run different algorithms and to allow changes and improvements. Its main board includes a digital core, implemented on a Xilinx 4028 Series FPGA, which comprises a custom programmable Control Unit, a digital monochrome PAL video generator and an image memory selector. Video SRAM chips are included to store and access images processed by the ACE16k. Two daughter boards hold the program SRAM and a video DAC-mixer card is used to generate composite analog video signal.

关键词： ACE 16k vision system stand-alone vision pre-processing real-time full custom control unit

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A VLSI architecture of 2D wavelet transforms

A VLSI architecture of 2D wavelet transforms

引用

7th IEEE International Conference on Electronics, Circuits and Systems

作者： Achour, C Houle, JL Davidson, J Ecole Polytech Montreal PQ H3C 3A7 Canada

ISBN: (纸本)0780365429

This paper presents a new implementation of a 2D wavelet transform in a VLSI circuit, for real-time digital signal processing. The parallel algorithm of the 2D wavelet transform (2D-WT) used for designing and implementing this new architecture enhances the performance of computations. The proposed multi-elementary processor architecture of 2D-WT yields a very flexible hardware configuration. This approach offers a high processing speed, relative to other methods, for providing the wavelet coefficients. The 2D-WT is a powerful tool for several applications, the most important one being image processing.

关键词： algorithms architectures Fourier transform FPGA Processor VLSI Wavelet transforms

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Variable partitioning for dual memory bank DSPs

Variable partitioning for dual memory bank DSPs

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IEEE International Conference on Acoustics, Speech, and Signal processing

作者： Leupers, R Kotte, D Univ Dortmund Dept Comp Sci 12 D-44221 Dortmund Germany

ISBN: (纸本)0780370414

DSPs with dual memory banks offer high memory bandwidth, which is required for high-performance applications. However, such DSP architectures pose problems for C compilers, which are mostly not capable of partitioning program variables between memory banks. As a consequence, time-consuming assembly programming is required for an efficient coding of time-critical algorithms. This paper presents a new technique for automatic variable partitioning between memory banks in compilers, which leads to a higher utilization of available memory bandwidth in the generated machine code. We present experimental results obtained by integrating the proposed technique into an existing C compiler for the AMS Gepard, an industrial DSP core.

关键词： digital signal processing

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A secure OsiriX plug-in for detecting suspicious lesions in breast DCE-MRI

A secure OsiriX plug-in for detecting suspicious lesions in ...

引用

13th International Conference on algorithms and architectures for Parallel processing, ICA3PP 2013

作者： Piantadosi, Gabriele Marrone, Stefano Sansone, Mario Sansone, Carlo University of Naples Federico II Italy

ISBN: (纸本)9783319038889

Up-to-date medical image processing is currently based on very sophisticated algorithms that often require a large computational load not always available on conventional workstations. Moreover, algorithms are in continuous evolution and hence clinicians are typically required to update their workstation periodically. The main objective of this paper is to propose a secure and versatile client-server architecture for providing these services at a low cost. In particular, we developed a plug-in allowing OsiriX - a widespread medical image processing application dedicated to DICOM images coming from several equipments - to interact with a system for automatic detection of suspicious lesions in breast DCE-MRI. The large amount of data and the privacy of the information flowing through the network requires a flexible but comprehensive security approach. According to NIST guidelines, in our proposal data are transmitted over SSL/TLS channel after an authentication and authorization procedure based on X.509 standard digital certificate associated with a 3072bit RSA Key Pair. Authentication and authorization procedure is achieved through the services offered by Java JAAS classes. © Springer International Publishing Switzerland 2013.

关键词： Big data

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A micrqprogrammable processor architecture for image processing

A micrqprogrammable processor architecture for image process...

引用

architectures and algorithms for digital image processing iiI 1985

作者： Rommelaere, J. Van Eycken, L. Wambacq, P. Oosterlmck, A. E.S.A.T.-C.M.E. Catholic University of Leuven de Croylaan 52 B HeverleeB-3030 Belgium

Because it is nearly impossible with todays technology to make a processor which is optimised for all possible image processing tasks one tries to realize different processors each of them being a compromise between technology, processing speed and class of operations that must be performed optimaly. This paper describes a hardware module to be part of a general image computer that is being developed in our laboratory. The design of this single board module was started to provide us with a flexible and hiah speed processor reprogrammable for several classes of image operations. To some extend this processor will be useful in hierarchical structures which seem to be very promising concepts at our days. © 1986 SPIE. All rights reserved.

关键词： Computer hardware

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A unified design framework for Vector Rotational CORDIC Family based on Angle Quantization process

A unified design framework for Vector Rotational CORDIC Fami...

引用

IEEE International Conference on Acoustics, Speech, and Signal processing

作者： Wu, AY Wu, CS Natl Taiwan Univ Dept Elect Engn Taipei 106 Taiwan

ISBN: (纸本)0780370414

Vector rotation is the key operation employed extensively in many digital signal processing applications. In this paper, we introduce a new design concept called Angle Quantization (AQ). It can be used as a design index for vector rotational operation, where the rotational angle is known in advance. Based on the AQ process, we establish a unified design framework for cost-effective low-latency rotational algorithms and architectures. Several existing works, such as conventional CORDIC, AR-CORDIC, MVR-CORDIC, and EEAS-based CORDIC, can be fitted into the design framework, forming a Vector Rotational CORDIC Family. Based on the new design framework, we can realize high-speed / low-complexity rotational VLSI circuits, whereas without degrading the precision performance in fixed-point implementations.

关键词： digital signal processing

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Analysis of the features of image processing using the Hamming network on the STM-32 microcontroller 2

Analysis of the features of image processing using the Hammi...

引用

2nd International Scientific Conference on Metrological Support of Innovative Technologies, ICMSIT ii-2021

作者： Chepkov, A.O. Klimachev, V.S. Korchagin, A.I. Vlasov, A.I. Bauman Moscow State Technical University 5 2-aj Baumanskaya Moscow660041 Russia

The paper discusses the features of solving a class of problems for pattern recognition using the STM-32 microcontroller. The problem of pattern recognition can be solved on neural networks of different architectures, the main attention is paid to the Hamming neural network model. The features of the implementation of the Hamming network based on the STM-32 microcontroller for the recognition of images entered via the touch screen are analyzed. It is experimentally shown that the network cannot always correctly process the input value and compare it with the reference value of the class for digital test images. This is due to the high degree of similarity of some images and the presence of noise. In conclusion, recommendations on the implementation of neural network algorithms for image processing on microcontrollers are given. © Published under licence by IOP Publishing Ltd.

关键词： Microcontrollers

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Parallelization and performance of 3D ultrasound imaging beamforming algorithms on modern clusters

Parallelization and performance of 3D ultrasound imaging bea...

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Conference Proceedings of the 2002 International Conference on Supercomputing

作者： Zhang, Fan Bilas, A. Dhanantwari, Amar Plataniotis, Kostas N. Abiprojo, Robert Stergiopoulos, Stergios Dept. of Electrical and Comp. Eng. University of Toronto 10 King's College Road Toronto Ont. M5S3G4 Canada

Recently there has been a lot of interest in improving the infrastructure used in medical applications. In particular, there is renewed interest on non-invasive, high-resolution diagnostic methods. One such method is digital, 3D ultrasound medical imaging. Current state-of-the-art ultrasound systems use specialized hardware for performing advanced processing of input data to improve the quality of the generated images. Such systems are limited in their capabilities by the underlying computing architecture and they tend to be expensive due to the specialized nature of the solutions they employ. Our goal in this work is twofold: (i) To understand the behavior of this class of emerging medical applications in order to provide an efficient parallel implementation and (ii) to introduce a new benchmark for parallel computer architectures from a novel and important class of applications. We address the limitations faced by modern ultrasound systems by investigating how all processing required by advanced beamforming algorithms can be performed on modern clusters of high-end PCs connected with low-latency, high-bandwidth system area networks. We investigate the computational characteristics of a state-of-the-art algorithm and demonstrate that today's commodity architectures are capable of providing almost-real-time performance without compromising image quality significantly.

关键词： Parallel processing systems

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