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Array set addressing: enabling technology for the efficient processing of hexagonally sampled imagery

JOURNAL OF electronic imaging 2011年第2期20卷 023012-023012-11页

作者： Rummelt, Nicholas I. Wilson, Joseph N. USAF Res Lab AFRL RWGI Eglin AFB FL 32542 USA Univ Florida Dept Comp & Informat Sci & Engn Gainesville FL 32611 USA

It has long been known that there are numerous advantages to sampling images hexagonally rather than rectangularly. However, due to various shortcomings of the addressing schemes, hexagonal sampling for digital images has not been embraced by the mainstream digital imaging community. the idea of using hexagonal sampling for digital imaging applications has been around since the early 1960s, yet no efficient addressing method for hexagonal grids has been developed in that time. this paper introduces a new hexagonal addressing approach, called array set addressing (ASA), that solves the problems exhibited by other addressing methods. the ASA approach uses three coordinates to represent the hexagonal grid as a pair of rectangular arrays. this representation supports efficient linear algebra and image processing manipulation. ASA-based implementations of several basic image processing operations are presented and shown to be efficient. A hexagonal fast Fourier transform, based on the fact that the Fourier kernel becomes separable when using ASA coordinates, is also presented. (C) 2011 spie and IS&t. [DOI: 10.1117/1.3589306]

关键词： algorithms Convolution Fourier transforms image processing Networks Digital imaging Linear algebra Wavelets

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proceedings of spie-IS and t electronic imaging - Parallel processing for imaging Applications

Proceedings of SPIE-IS and T Electronic Imaging - Parallel P...

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Parallel processing for imaging Applications

ISBN: (纸本)9780819484093

the proceedings contain 28 papers. the topics discussed include: using a commercial graphical processing unit and the CUDA programming language to accelerate scientific image processing applications;automatic distribution of vision-tasks on computing clusters;highly scalable digital front end architectures for digital printing;parallel training and testing methods for complex image processing algorithms on distributed, heterogeneous, unreliable, and non-dedicated resources;integrated parallel printing systems with hypermodular architecture;parallel processing considerations for image recognition tasks;GPGPU real-time texture analysis framework;a novel parallel algorithm for airport runway segmentation in satellite images using priority directional region growing strategy based on ensemble learning;visualization assisted by parallel processing;and a parallel impulse-noise detection algorithm based on ensemble learning for switching median filters.

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Case for a field-programmable gate array multicore hybrid machine for an image-processing application

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JOURNAL OF electronic imaging 2011年第1期20卷 013015-013015-9页

作者： Rakvic, Ryan N. ives, Robert W. Lira, Javier Molina, Carlos USN Acad Dept Elect & Comp Engn Annapolis MD 21402 USA Univ Politecn Cataluna Comp Architecture Dept Barcelona Spain

General purpose computer designers have recently begun adding cores to their processors in order to increase performance. For example, Intel has adopted a homogeneous quad-core processor as a base for general purpose computing. PlayStation3 (PS3) game consoles contain a multicore heterogeneous processor known as the Cell, which is designed to perform complex image processing algorithms at a high level. Can modern image-processing algorithms utilize these additional cores? On the other hand, modern advancements in configurable hardware, most notably field-programmable gate arrays (FPGAs) have created an interesting question for general purpose computer designers. Is there a reason to combine FPGAs with multicore processors to create an FPGA multicore hybrid general purpose computer? Iris matching, a repeatedly executed portion of a modern iris-recognition algorithm, is parallelized on an Intel-based homogeneous multicore Xeon system, a heterogeneous multicore Cell system, and an FPGA multicore hybrid system. Surprisingly, the cheaper PS3 slightly outperforms the Intel-based multicore on a core-for-core basis. However, both multicore systems are beaten by the FPGA multicore hybrid system by > 50%. (C) 2011 spie and IS&t. [DOI: 10.1117/1.3553798]

关键词： Field programmable gate arrays Iris image processing Data storage Iris recognition Computer hardware

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Estimation of fire volume by stereovision

Estimation of fire volume by stereovision

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Conference on image processing - Machine Vision Applications iv

作者： Molinier, t. Rossi, L. Akhloufi, M. tison, Y. Pieri, A. Univ Corsica UMR CNRS SPE 6134 F-20250 Corte France CRVI Levis PQ G6V 6Z9 Canada

ISBN: (纸本)9780819484147

this paper presents a new approach for the estimation of fire front volume in indoor laboratory experiments. this work deals with fire spreading on inclinable tables. the method is based on the use of two synchronized stereovision systems positioned respectively in a back position and in a front position of the fire propagation direction. the two vision systems are used in order to extract complementary 3D fire points. the obtained data are projected in a same reference frame and used to build a global form of the fire front. An inter-systems calibration procedure is presented and permits the computation of the projection matrix in order to project all the data to a unique reference frame. From the obtained 3D fire points, a three dimensional surface rendering is performed and the fire volume is estimated.

关键词： Stereovision fire registration 3D reconstruction volume

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proceedings of spie-IS and t electronic imaging - Computational imaging IX

Proceedings of SPIE-IS and T Electronic Imaging - Computatio...

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Computational imaging IX

ISBN: (纸本)9780819484109

the proceedings contain 32 papers. the topics discussed include: sparse Fisher's linear discriminant analysis;characterization of moving dust particles;a super-resolution algorithm for enhancement of flash lidar data;image registration for stability testing of MEMS;capacitive touch sensing: signal and image processing algorithms;denoising, deblurring, and superresoluton in mobile phones;arabic word recognizer for mobile applications;volume estimation using food specific shape templates in mobile image-based dietary assessment;a hybrid approach to imaging and anomaly characterization from dual energy Ct data;robust multifrequency inversion in terahertz diffraction tomography;classification-aware dimensionality reduction methods for explosives detection using multi-energy x-ray computed tomography;and constrain static target kinetic iterative image reconstruction for 4D cardiac Ct imaging.

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proceedings of spie-IS and t electronic imaging - Real-time image and Video processing 2011

Proceedings of SPIE-IS and T Electronic Imaging - Real-Time ...

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Real-time image and Video processing 2011

ISBN: (纸本)9780819484086

the proceedings contain 24 papers. the topics discussed include: towards real-time image quality assessment;2000 fps real-time target tracking vision system based on color histogram;real-time iris tracking with a smart camera;optimization of image processing algorithms on mobile platforms;scalable software architecture for on-line multi-camera video processing;real-time implementation of logo detection on open source beagleboard;low complexity orientation detection algorithm for real-time implementation;real-time topological image smoothing on shared memory parallel machines;multithreaded real-time 3D image processing software architecture and implementation;real-time video streaming using H.264 scalable video coding (SVC) in multihomed mobile networks: a testbed approach;real-time patch sweeping for high-quality depth estimation in 3D video conferencing applications;and real-time scene change detection assisted with camera 3A: auto exposure, auto white balance, and auto focus.

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proceedings of spie-IS and t electronic imaging - image processing: algorithms and systems VIII

Proceedings of SPIE-IS and T Electronic Imaging - Image Proc...

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image processing: algorithms and systems VIII

ISBN: (纸本)9780819479259

the proceedings contain 31 papers. the topics discussed include: latent common origin of bilateral filter and non-local means filter;a new edge detection algorithm in image processing based on LIP-ratio approach;edge-detected detail enhancement through synthesis of multi-light images;a method for blind estimation of spatially correlated noise characteristics;a robust and fast approach for multiple image components stitching;color-to-grayscale conversion with color clustering and significance criteria;key points selection by using zernike polynomials;efficient implementation of kurtosis based no reference image sharpness metric;exploiting DCt masking effect to improve the perceptual quality of data hiding;hierarchical representation of objects using shock graph methods;hand-movement-based in-vehicle driver/front-seat passenger discrimination for centre console controls;and novel medical image enhancement algorithms.

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A robust segmentation and tracking method for characterizing GNSS signals reception environment

A robust segmentation and tracking method for characterizing...

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IS&t/spie electronic imaging

作者： Cohen, A. Meurie, C. Ruichek, Y. Marais, J. Systems and Transportation Laboratory Université de Technologie de Belfort-Montbeliard 13 rue Ernest Thierry Mieg 90010 Belfort Cedex France Univ. Lille Nord de France Lille France INRETS LEOST Villeneuve d'Ascq 20 rue Elise Reclus 59650 Villeneuve d'Ascq France

ISBN: (纸本)9780819484147

this paper is focused on the characterization of GNSS signals reception environment by estimation of the percentage of visible sky in real-time. On previous works, a new segmentation technique based on a color watershed using an adaptive combination of color and texture information was proposed. this information was represented by two morphological gradients, a classical color gradient and a morphological texture gradient based on mathematical morphology or co-occurrence matrices. the segmented images were then classified into two regions: sky and not-sky. However, this approach has high computational cost and thus, cannot be applied in real-time. On this paper, we present this adaptive segmentation method with a texture gradient calculated by the Gabor filter and a region-tracking method based on a block-matching estimation. this last step reduces the execution time of the application in order to respect the real-time conditions. Since the application works for fish-eye images, a calibration and rectification method is required before tracking and is also presented on this paper. the calibration method presented is based on the straight line condition and thus does not use real word coordinates. this prevents measurement errors. the tracking results are compared to the results of the classification method (which has already been evaluated on previous works). the evaluation shows that the proposed method has a very low error and decreases the execution time by ten times. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (spie).

关键词： image segmentation

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proceedings of spie-IS and t electronic imaging - imaging and Printing in a Web 2.0 World;and Multimedia Content Access: algorithms and systems iv

Proceedings of SPIE-IS and T Electronic Imaging - Imaging an...

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imaging and Printing in a Web 2.0 World;and Multimedia Content Access: algorithms and systems iv

ISBN: (纸本)9780819479334

the proceedings contain 36 papers. the topics discussed include: contextual advertisement placement in printed media;content-based image retrieval with ontological ranking;a case study on rule-based and CRF-based author extraction methods;new performance evaluation models for character detection in images;navigating web search results;cloud-based printing for mobile devices;using ePub as framework for the automated collection, tagging, and transformation of web content for cross-media publication;a web-based rapid assessment tool for production publishing solutions;an investigation of document aesthetics for web-to-print repurposing of small-medium business marketing collateral;learning from graphic designers: using grids as a scaffolding for automatic print layout;ubiquitous picture-rich content representation;a novel XML-based document format with printing quality for web publishing;and faces from the web: automatic selection and composition of media for casual screen consumption and printed artwork.

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Automatic Eye Enhancement by Sclera Whitening

Automatic Eye Enhancement by Sclera Whitening

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Conference on imaging and Printing in a Web 2.0 World;and Multimedia Content Access - algorithms and systems iv

作者： Lee, Changhyung Schramm, Morgan t. Boutin, Mireille Allebach, Jan P. Purdue Univ Sch Elect & Comp Engn W Lafayette IN 47907 USA Hewlett Packard Corp Boise ID 83714 USA

ISBN: (纸本)9780819479334

We propose a method for automatically enhancing the eyes of all the faces in a digital image by whitening their scleras (i.e., the white part of their eyes). the scleras are identified by combining existing face detection and feature alignment technology with a color-based sclera probability map. We then smooth, brighten, and desaturate the scleras. this reduces the appearance of blood vessels and produces a healthier, more "refreshed" look.

关键词： Sclera Eye Facial recognition systems image processing Chromium image enhancement Veins Picosecond phenomena Sensors Detection and tracking algorithms

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