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检索条件"任意字段=Wavelets: Applications in Signal and Image Processing X"

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Performance evaluation of quadratic correlation filters for target detection and discrimination in infrared imagery

Performance evaluation of quadratic correlation filters for ...

引用

Conference on Optical Pattern Recongnition xV

作者： Richard, S Sims, F Mahalanobis, A USA RD&E Command Aviat & Missile RDEC Redstone Arsenal AL 35898 USA

ISBN: (纸本)0819453609

The detection and discrimination of targets in infrared imagery has been a challenging problem due to the variability of the target and clutter (background) signatures. In this paper we discuss the application of a novel quadratic filtering method using missile seeker infrared closing sequences. image filtering techniques are well suited for target detection applications since they avoid the disadvantages of typical pixel-based detection schemes (such as segmentation and edge extraction). Another advantage is that the throughput complexity of the filtering approach, in the detection process, also does not vary with scene content. The performance of the proposed approach is assessed on several data sets, and the results are compared with that of previous linear filtering techniques. Since we can obtain the signature of some of the clutter "in-the-field" or during operation, we examine the impact of updating the filters to adapt to the clutter.

关键词： Target detection image filtering Linear filtering Filtering (signal processing) Infrared imaging Infrared radiation Optical filters image processing Infrared detectors Target recognition

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signal processing industrial application: A new data controller design using VHDL

Signal processing industrial application: A new data control...

引用

Sixth IASTED International Conference on signal and image processing

作者： Coggins, Thomas J. Cirstea, Marcian N. Cuff, Alan De Montfort University The Gateway Leicester LE1 9BH United Kingdom Transmitton Ltd. Ashby Park Leicestershire LE65 1JD United Kingdom

ISBN: (纸本)088986442X

The paper presents a signal processing industrial application: A new approach to the design of Integrated Circuits used in the fastflex range of products by Transmitton Ltd., a competitive manufacturer of industrial control equipment in UK. The company has embarked in a process of re-designing its products, using Hardware Description Languages (HDLs) and targeting re-programmable devices - Field Programmable Gate Arrays (FPGA's) for implementation. A sample case study of a Data Controller re-design is discussed. This makes the objective of ongoing research collaboration between the company and De Montfort University, UK. The novel design was modelled, simulated and evaluated using Very High Speed Integrated Circuit Hardware Description Language (VHDL). The advantages of applying this methodology consist of: i) using the same environment for modelling, design and implementation, ii) a computer platform independent model (VHDL files are ASCII files), iii) reusability of the model in different signal processing applications (in combination with other models to form complex controller systems) and v) rapid prototyping via FPGA implementation. The new university led approach aims to give the company important advantages in terms of commercial competitiveness, flexibility in the range of in-house developed products and short time to market for new products.

关键词： signal processing

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Statistical signal processing: applications to beamforming, detection, and estimation

Statistical signal processing: Applications to beamforming, ...

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Medical Imaging 2004 Conference

作者： Scharf, LL Colorado State Univ Ft Collins CO 80523 USA

ISBN: (纸本)0819452866

Behind the algebra of statistical signal processing there lies a fascinating geometry. Our aim in this keynote talk is to develop this geometry, and use it to illuminate a number of problems in beamforming, detection, and estimation. In the realm of beamforming, we revisit the Capon, or MVDL beamformer, and establish its connections to more conventional beamformers like the Bartlett. We then offer several extensions to the Capon beamformer, making it suitable for the imaging of distributed targets from broadband data. For detection, we review the geometry of matched and adaptive subspace detectors. These detectors are matched to multidimensional subspaces, making them suitable for detecting distributed or broadband sources. They generalize much of what is known about matched filters, which are matched only to one-dimensional subspaces. Our review of estimation exploits the geometry of oblique projections. These processors have the virtue that they image sources with perfect nulling of nearby sources. Of course there is a price to pay in noise gain. This price depends on principal angles between subspaces, explaining why super-resolution is a risky enterprise.

关键词： Statistical analysis Statistical signal processing Ultrasonography Phased arrays signal processing Beam analyzers Sensors Time-frequency analysis Filtering (signal processing) Statistical modeling

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CMOS image sensor array for surface plasmon resonance spectroscopy

CMOS image sensor array for surface plasmon resonance spectr...

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Conference on Sensors and Camera Systems for Scientific, Industrial, and Digital Photography applications V

作者： Rhee, J Wang, D Tao, NJ Joo, YJ Arizona State Univ Dept Elect Engn Tempe AZ 85287 USA

ISBN: (纸本)0819452041

A novel surface plasmon resonance (SPR) sensor system using CMOS image sensor array is proposed in this paper. Recently, a simple SPR system was proposed by the author, which achieved high resolution and fast response time using a bi-cell photo-detector. However it requires mechanical adjustment process to balance two signals of the bi-cell before measurement. It requires not only additional time but also additional mechanical control unit, which is a source of the noise. It also suffers from the small linear range. The proposed method chooses a pixel as the center from many pixels, which gives the most balance of bi-cell signal. Therefore no mechanical adjustment is required. The method also overcomes the small linear range problem by switching the center adaptively during the test. Furthermore, it has several advantages of CMOS image sensor such as low cost, low power, and on-chip functionality, which makes the proposed SPR sensor system be a good candidate for field applications. A prototype CMOS image sensor chip with 12bits, analog to digital converter is designed and fabricated with 0.5um AMI CMOS technology.

关键词： surface plasmon resonance CMOS image sensor data processing

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Super-Resolution for translated satellite images using the Walsh functions

Super-Resolution for translated satellite images using the W...

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Conference on image and signal processing for Remote Sensing Ix

作者： Omrane, N Palmer, P Univ Surrey Surrey Space Ctr Guildford GU2 7XH Surrey England

ISBN: (纸本)0819451215

The aim of Super-Resolution techniques is to produce a high-resolution image from a sequence of shifted low-resolution images. These low-resolution images are generally taken from slightly different viewpoints, which can result in some new information from one image to another. Super-resolution is a very attractive research area and finds its applications in many domains. We present in this paper a new algorithm to achieve image Super-Resolution suitable for sequences of satellite images. The shift between images is estimated using a new measure based upon the sharpness property of edges in the reconstructed image. The reconstruction is performed using a new approach to super-re solution based on the orthogonal set of Walsh-functions. In this paper we shall derive an expression for the missing information contained in an image of 2(M+I) pixels but absent in the lower resolution image of 2(M) pixels. From this we prove how this information can be retrieved from a second image containing 2(M) pixels, shifted from the first by an arbitrary amount. We then derive analytic models for the distortion of edge information by this process and use the bluffing in the reconstructed image to perform accurate registration between the two shifted images at low resolution. We present results from this method based upon test imagery where the shift is known a priori to evaluate performance.

关键词： Super-Resolution image registration Walsh functions image enhancement

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Edge detection using combined isotropic and directional wavelets and fuzzy logic methods

Edge detection using combined isotropic and directional wave...

引用

International Conference on Information and Communication Technologies: From Theory to applications, ICTTA

作者： J.M. Niya A. Aghagolzadeh Faculty of Electrical Engineering University of Tabriz Tabriz Iran

Edge detection is an important vision process for reducing the amount of data in the raw images to facilitate the high-level image processing tasks, since edges can delineate shape of the objects and contain the most information. In this paper, we propose edge detection using combined isotropic and directional wavelets and fuzzy logic methods.

关键词： image edge detection Fuzzy logic Wavelet transforms Wavelet analysis image processing Multiresolution analysis Java signal processing Shape Wavelet domain

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JPSEC for secure imaging in JPEG 2000

JPSEC for secure imaging in JPEG 2000

引用

Conference on applications of Digital image processing xxVII

作者： Dufaux, F Wee, SJ Apostolopoulos, JG Ebrahimi, T Swiss Fed Inst Technol Signal Proc Inst CH-1015 Lausanne Switzerland

ISBN: (纸本)0819454966

In this paper, we first review the on-going JPSEC standardization activity. Its goal is to extend the baseline JPEG 2000 specification to provide a standardized framework for secure imaging, in order to support tools needed to secure digital images, such as content protection, data integrity check, authentication, and conditional access control. We then present two examples of JPSEC tools. The first one is a technique for secure scalable streaming and secure transcoding. It allows the protected JPSEC codestream to be transcoded while preserving the protection, i.e. without requiring unprotecting (e.g. decrypting) the codestream. The second one is a technique for conditional access control. It can be used for access control by resolution or quality, but also by regions of interest

关键词： JPEG 2000 JPSEC secure imaging encryption secure transcoding scrambling

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Real-time fault detection of braiding ropes using recognition methods

Real-time fault detection of braiding ropes using recognitio...

引用

Conference on Machine Vision and Its Optomechatronic applications

作者： Matela, L Tech Univ Liberec Dept Measurement Liberec 46117 Czech Republic

ISBN: (纸本)0819455563

Formation of this paper is evoked by solving of device that is able to detect faults of braiding ropes in real-time. Many various inspection devices for textile industry were developed. However, rope-producing textile company has come with demand of intelligent inspection device that is able to detect faults in finishing process. The winding speeds are 50 200 m/min. Nowadays commercial devices are focused on textile fabrics (weaving or knitting) and they are only able to detect basic faults (holes, dirty and oil spots). Considering textile structure faults are possible to find in several research papers, however, for specific types of textiles or for slow processes only. The inspection device, which has been developed in our laboratory, is able to work with high winding speeds of rope. The device is based on fast line-scan camera with Camera-Link interface. The goal of the project was to search three basic structure faults: missing strand, strands pulled tight and stitch irregularity. The principle of fault detection is based on gathering the most suitable symptoms that are used for recognition methods. These methods are very successful for speech recognition and using them even bring us better results than using neural networks. This paper shows the way of finding the most suitable symptoms, their statistical evaluation and decision making algorithms. The most important step is reducing the problem from time-consuming image processing to one-dimensional signal processing.

关键词： inspection device fault detection braiding ropes image processing signal processing

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Reversible wavelets for image compression

Reversible wavelets for image compression

引用

International Conference on Information and Communication Technologies: From Theory to applications, ICTTA

作者： T. Brahimi A. Bouridane A. Melit F. Khelifi A. Bourouina Department of Electronic Engineering Faculty of Engineering Science LAMEL Laboratory University of Jijel Algeria Queen''s University Belfast UK

Reversible wavelet transforms that map integer to integer have important applications in lossless representation. In addition, the lifting scheme is a method to improve a given discrete wavelet transform to obtain specific properties of great importance like a exact arithmetic for calculating transform, a smaller word size for storing transform coefficients, leading to reduced memory requirements, and a fast, in-place implementation of the wavelet transform, in this paper, we focus on reversible wavelets, based on the lifting scheme, for a class of biothogonal wavelets. Besides, we analyse the performance of numerous reversible transforms using an embedded image coding system, for grey level and colour image on the basis of their lossless compression performance.

关键词： image coding Discrete wavelet transforms Performance loss Laboratories signal processing image processing Arithmetic image analysis Performance analysis image color analysis

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image compression and transmission based on LAN

Image compression and transmission based on LAN

引用

Conference on applications of Digital image processing xxVII

作者： Huang, SJ Li, YF Zhang, ZJ Shanghai Univ Sch Commun & Informat Engn Shanghai 200072 Peoples R China

ISBN: (纸本)0819454966

In this work an embedded system is designed which implements MPEG-2 LAN transmission of CVBS or S-video signal. The hardware consists of three parts. The first is digitization of analog inputs CVBS or S-video (Y/C) from TV or VTR sources. The second is MPEG-2 compression coding primarily performed by a MPEG-2 1chip audio/video encoder. Its output is MPEG-2 system PS/TS. The third part includes data stream packing, accessing LAN and system control based on an ARM microcontroller. It packs the encoded stream into Ethernet data frames and accesses LAN, and accepts Ethernet data packets bearing control information from the network and decodes corresponding commands to control digitization, coding, and other operations. In order to increase the network transmission rate to conform to the MEPG-2 data stream, an efficient TCP/IP network protocol stack is constructed directly from network hardware provided by the embedded system, instead of using an ordinary operating system for embedded systems. In the design of the network protocol stack to obtain a high LAN transmission rate on a low-end ARM, a special transmission channel is opened for the MPEG-2 stream. The designed system has been tested on an experimental LAN. The experiment shows a maximum LAN transmission rate up to 12.7 Mbps with good sound and image quality, and satisfactory system reliability.

关键词： MPEG-2 compression LAN transmission network protocol stack embedded system

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