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

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Real-time image processing and fusion for a new high-speed dual-band infrared camera

Real-time image processing and fusion for a new high-speed d...

引用

Conference on Infrared Imaging Systems - Design, Analysis, Modeling, and Testing xVIII

作者： Mueller, Markus Schreer, Oliver Saenz, Monica Lopez Fraunhofer Inst Informat & Data Proc Fraunhoferstr 1 D-76131 Karlsruhe Germany IRCAM GmbH D-91058 Erlangen Germany

ISBN: (纸本)9780819466655

A dual-band infrared camera system based on a dual-band quantum well infrared photodetector (QWIP) has been developed for acquiring images from both the mid-wavelength (MWIR) and long-wavelength (LWIR) infrared spectral band. The system delivers exactly pixel-registered simultaneously acquired images. It has the advantage that appropriate signal and image processing permit to exploit differences in the characteristics of those bands. Thus, the camera reveals more information than a single-band camera. It helps distinguishing between targets and decoys and has the ability to defeat many IR countermeasures such as smoke, camouflage and flares. Furthermore, the system permits to identify materials (e.g. glass, asphalt, slate, etc.), to distinguish sun reflections from hot objects and to visualize hot exhaust gases. Furthermore, dedicated software for processing and exploitation in real-time extends the application domain of the camera system. One component corrects the images and allows for overlays with complementary colors such that differences become apparent. Another software component aims at a robust estimation of transformation parameters of consecutive images in the image stream for image registration purposes. This feature stabilizes the images also under rugged conditions and it allows for the automatic stitching of the image stream to construct large mosaic images. Mosaic images facilitate the inspection of large objects and scenarios and create a better overview for human observers. In addition, image based MTI (moving target indication) also for the case of a moving camera is under development. This component aims at surveillance applications and could also be used for camouflage assessment of moving targets.

关键词： dual-band infrared QWIP image processing and exploitation registration MTI

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Multi-sensor detection and fusion technique

Multi-sensor detection and fusion technique

引用

Conference on Multisensor, Multisource Information Fusion

作者： Bhargave, Ashish Arnbrose, Barry Lin, Freddie Kazantzidis, Manthos Broadata Commun Inc Torrance CA USA

ISBN: (纸本)9780819466938

A multi-sensor detection and fusion technology is described in this paper. The system consist of inputs from three sensors, Infra Red, Doppler Motion, and Stereo Video. This choice of sensors is designed to give high reliability, infra red and Doppler to provide detection ability at night, stereo video has the ability to analyze depth and range information. The combination of these sensors has the ability to provide high probability of detection and very low false alarm rate. The technique consists of three processing parts corresponding to each sensor data, and a fusion module, which makes the final decision based on the inputs from the three parts. The signal processing and detection algorithms process the inputs from each sensors and provides a specific information to the fusion module. Fusion module is based on bayes belief propagation theory. It takes the processed inputs from all the sensor modules and provides a final decision on the presence and absense of objects, as well as their reliability based on the iterative belief propagation algorithm operating on decision graphs. A prototype system was built using the technique to study the feasibility of intrusion detection for NASA's launch danger zone protection. The system verified the potential of the proposed algorithms and proved the feasibility of high probability of detection and low false alarm rates compared to many existing techniques.

关键词： Sensors Video Detection and tracking algorithms image processing Doppler effect Prototyping signal processing Infrared sensors Surveillance Video surveillance

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Detecting Alzheimer Disease in Magnetic Resonance Brain images Using Gabor wavelets

Detecting Alzheimer Disease in Magnetic Resonance Brain Imag...

引用

IEEE signal processing and Communications applications (SIU)

作者： Ulas Bagci Li Bai CMIAG School of Computer Science and IT University of Nottingham UK

A novel method for classification of magnetic resonance brain images is presented in this paper. We construct a computational framework for discriminative image feature subspaces. Magnetic resonance images of patients in Alzheimer's disease and normal brain MR images are classified with support vector machines. The framework for the novel method bases on the extraction of gabor features from 2D-magnetic resonance images in different scales and orientations. Experiments show that Gabor wavelets can significantly improve classification performance with respect to other popular approaches reported recently in the literature. Combination of gabor features in 3 scales and 8 orientations give 100% classification performance. Experimental results with promising improvements and comparison to related studies are provided.

关键词： Alzheimer's disease Magnetic resonance Brain Support vector machines Multiple sclerosis Computer science Support vector machine classification Feature extraction Magnetic resonance imaging Dementia

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Local adaptive contrast enhancement for color images

Local adaptive contrast enhancement for color images

引用

Conference on Visual Information processing xVI

作者： Dijk, Judith den Hollander, Richard J. M. Schavemaker, John G. M. Schutte, Klamer TNO Def Secur & Safety POB 96564 NL-2509 JG The Hague Netherlands

ISBN: (纸本)9780819466976

A camera or display usually has a smaller dynamic range than the human eye. For this reason, objects that call be detected by the naked eye may not be visible in recorded images. Lighting is here an important factor;improper local lighting impairs visibility of details or even entire objects. When a human is observing a scene with different kinds of lighting, such as shadows, he will need to see details in both the dark and light parts of the scene. For grey value images such as IR imagery, algorithms have been developed in which the local contrast of the image is enhanced using local adaptive techniques. In this paper, we present how such algorithms can be adapted so that details in color images are enhanced while color information is retained. We propose to apply the contrast enhancement on color images by applying a grey value contrast enhancement algorithm to the luminance channel of the color signal. The color coordinates of the signal will remain the same. Care is taken that the saturation change is not too high. Gamut mapping is performed so that the output can be displayed on a monitor. The proposed technique can for instance be used by operators monitoring movements of people in order to detect suspicious behavior. To do this effectively, specific individuals should both be easy to recognize and track. This requires optimal local contrast, and is sometimes much helped by color when tracking a person with colored clothes. In such applications, enhanced local contrast in color images leads to more effective monitoring.

关键词： local contrast image enhancement adaptive color

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Proceedings of SPIE - Mathematics of Data/image Pattern Recognition, Compression, Coding, and Encryption x, with applications

Proceedings of SPIE - Mathematics of Data/Image Pattern Reco...

引用

Mathematics of Data/image Pattern Recognition, Compression, Coding, and Encryption x, with applications

ISBN: (纸本)9780819468482

The proceedings contain 18 papers. The topics discussed include: model based compression of the calibration matrix for hyperspectral imaging systems;optimization of a lossless object-based compression embedded on GAIA a next-generation space telescope;design of multichannel filter banks for subband coding of audio signals using multirate signal processing techniques;the optimum running-type approximation for time-limited worst-case measures of error based on Fredholm integral equation using Pincherle-Goursat kernel;adaptive model and neural network based watermark identification;compressed versus uncompressed domain video watermarking;generation of lattice independent vector sets for pattern recognition applications;and the validity of pyramid k-means clustering.

关键词： Pattern recognition

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Imaging spectral signature satellite instrument for the real-time identification of ground scenes with a dedicated spectral signature

Imaging spectral signature satellite instrument for the real...

引用

Conference on Optical Sensing Technology and applications

作者： Kantojarvi, Uula Saari, Heikki Viherkanto, Kai Herrala, Esko Harnisch, Bernd VTT POB 1000 FI-02044 Espoo Finland Specim FI-90571 Oulu Finland European Space Agcy NL-2200 AG Noordwijk Netherlands

ISBN: (纸本)9780819467133

With hyperspectral pushbroom imaging spectrometers on Earth observation satellites it is possible to detect and identify dedicated ground pixels by their spectral signature. Conventional time consuming on-ground processing performs this selection by processing the measured hyperspectral data cube of the image. The Imaging Spectral Signature Instrument (ISSI) concept combines an optical on-board processing of the hyperspectral data cube with a thresholding algorithm, to identify pixels with a pre-defined and programmable spectral signature, such as water, forest and minerals, in the ground swath. The Imaging Spectral Signature Instrument consists of an imaging telescope, which images an object line on the entrance slit of a first imaging spectrometer, which disperses each pixel of the object line into its spectral content and images the hyperspectral image on the spatial light modulator. This spatial light modulator will be programmed with a spatial transmission or reflection behavior, which is constant along the spatial pixels and along the spectral pixels identical to a filter vector that corresponds to the spectral signature of the searched specific feature. A second inverted spectrometer reimages the by the first spectrometer dispersed and by the spatial light modulator transmitted or reflected flux into a line of pixels. In case the spectral content of the ground scene is identical to the searched signature, the flux traversing or reflecting the spatial light modulator will be maximum. The related pixel can be identified in the final image as a high signal by a threshold discriminator. A component test setup consists of an imaging lens, two Imspector(TM) spectrographs, a spatial light modulator, which is a programmable transmissible liquid crystal display and a CCD sensor as a detector. A mathematical model was developed for the instrument and its performance was evaluated in order to compare different concept variations. All components were measured and charact

关键词： optical data processing spectral imaging hyperspectral spatial light modulation LCD

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Video coding based on distributed source coding

Video coding based on distributed source coding

引用

8th International Workshop on image Analysis for Multimedia Interactive Services, WIAMIS 2007

作者： Perra, Cristian Giusto, Daniele D. DIEE Department of Electrical and Electronic Engineering University of Cagliari Italy

ISBN: (纸本)076952818X

Distributed video coding is a new paradigm for video compression. Practical distributed video coding are promising solutions for emerging applications. Nevertheless, more study and exploration is needed. This paper proposes an application of distributed source coding for video coding. While most of the solutions proposed in literature rely on an off-line model training the proposed solution is based on an on-line model training that exploits information from conventionally encoded frames. © 2007 IEEE.

关键词： image coding

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image analysis of infrared quantitative data applied to Tokamak survey and safety: Present and future

Image analysis of infrared quantitative data applied to Toka...

引用

2007 IEEE International Symposium on Intelligent signal processing, WISP

作者： Travere, J.M. Balorin, C. Caulier, G. Desgranges, C. Dunand, G. Jouve, M. Moreau, P. Ravenel, N. Association Euratom-CEA CEA/DSM/DRFC Cadarache F-13 108 Saint Paul Lez Durance France

ISBN: (纸本)142440830X

During operation of present fusion devices, the Plasma Facing Components (PFCs) are submitted to large heat fluxes within a range of 10-20 MW/m2. Understanding and preventing overheating of these components during long pulse discharges is a crucial issue. The surface temperature of the PFCs in the inner chamber of a tokamak is measured by infrared (IR) cameras interfaced with complex optical systems. Due to the complexity of the observed IR scenes and the large amount of data produced, a computer-aided analysis of infrared images will be a key point for ITER, the next fusion device for both real-time applications and deferred-time analysis. This paper describes the current state of IR image analysis based on region of interest (ROI) approach at Tore Supra with an extrapolation to the future ITER tokamak. ©2007 IEEE.

关键词： Surveys

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Numerical simulation of SAR raw signal for ocean wave

Numerical simulation of SAR raw signal for ocean wave

引用

MIPPR 2007: Automatic Target Recognition and image Analysis;and Multispectral image Acquisition

作者： Ding, Guo xingfa, Gu Tao, Yu Qing, Dong xingfeng, Chen University of Electronic Science and Technology of China 610054 Chengdu State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Applications CAS Beijing 100101 China Demonstration Center of Spaceborne Remote Sensing National Space Administration 100101 Beijing

ISBN: (纸本)9780819469502

In order to study the SAR image of the ocean wave and the wave modulation of the RCS (radar cross section), the numerical simulation has been done by using the velocity bunching (VB) model with various parameters. The SAR image has a migration in the azimuthal direction for the wave velocity and the process of the nonlinear imaging. The way is an available method of studying the ocean wave image by SAR.

关键词： image analysis

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On optimal wavelet transform for watermarking

On optimal wavelet transform for watermarking

引用

International Symposium on signal processing and Its applications (ISSPA)

作者： Alireza Nasiri Avanaki Shahrooz Faghih Roohi Control and Intelligent Processing Center of Excellence School of ECE University of Tehran Tehran Iran

ISBN: (纸本)9781424407781;1424407796

In this paper, we propose a method of improving imperceptibility and robustness of a wavelet-based watermark by finding the optimal wavelet transform used for image decomposition required for watermark embedding. Our approach can be easily generalized for enhancing watermarking performance of any wavelet-based technique as they usually use predefined (not necessarily optimal) wavelets. We measured imperceptibility by PSNR and considered robustness to filtering or JPEG compression. To find the optimal wavelet, we used both local and global (genetic algorithm) optimizers. We applied our method to a recent wavelet-based watermarking scheme and achieved better watermarking properties both in terms of imperceptibility and robustness.

关键词： Wavelet transforms Watermarking Robustness Discrete wavelet transforms Filter bank Finite impulse response filter Genetic algorithms PSNR image reconstruction Hydrogen

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