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检索条件"任意字段=Image Processing: Algorithms and Systems VI"

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Performance of invariant face recognition techniques

Performance of invariant face recognition techniques

引用

Conference on algorithms and systems for Optical Information processing vi

作者： Alsamman, A Alam, MS Univ New Orleans Dept Elect Engn New Orleans LA 70146 USA

ISBN: (纸本)0819445568

In this paper we present a comparison between four invariant face recognition techniques: synthetic discriminant function (SDF) based recognition, projection-slice SDF based recognition, optoelectronic correlator based neural network, and pose estimation based recognition. The pose estimation technique does not involve composite image generation and is most successful of these techniques mainly due to its success in maintaining a low interclass crosscorrelation. The optoelectronic fringe-adjusted joint transform correlator (JTC) is used to provide correlation. A description of the optoelectronic system and the simulation results are provided.

关键词： Composites Databases Fourier transforms Optoelectronics Facial recognition systems Neural networks Optical correlators Neurons image analysis image processing

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A neural network approach for image analysis in optometry

A neural network approach for image analysis in optometry

引用

Conference on algorithms and systems for Optical Information processing vi

作者： Netto, AV de Oliveira, MCF Univ Sao Paulo ICMC USP BR-13560241 Sao Carlos SP Brazil

ISBN: (纸本)0819445568

In this work we describe the framework of a functional system for processing and analyzing images of the human eye acquired by the Hartmann-Shack technique (HS), in order to extract information to formulate a diagnosis of eye refractive errors (astigmatism, hypermetropia and myopia). The analysis is to be carried out using an Artificial Intelligence system based on Neural Nets, Fuzzy Logic and Classifier Combination. The major goal is to establish the basis of a new technology to effectively measure ocular refractive errors that is based on methods alternative those adopted in current patented systems. Moreover, analysis of images acquired with the Hartmann-Shack technique may enable the extraction of additional information on the health of an eye under exam from the same image used to detect refraction errors.

关键词： artificial intelligence neural network image processing Hartmann-Shack technique refractive errors optometry extraction of feature image recognition and analysis acquisition systems

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Integral imaging using a birefringent material and polarizer

Integral imaging using a birefringent material and polarizer

引用

Conference on algorithms and systems for Optical Information processing vi

作者： Park, JH Jung, SY Min, SW Lee, B Seoul Natl Univ Sch Elect Engn Natl Res Lab Holog Technol Seoul 151744 South Korea

ISBN: (纸本)0819445568

Integral imaging (or called integral photography) is an attractive three-dimensional display method because of its many advantages over other three-dimensional display methods. However, the thickness of the displayed three-dimensional image which can be expressed is limited by various optical parameters of the system and is relatively small. In this paper, we propose a method to increase the thickness of the displayed three-dimensional image without severe resolution degradation by adopting a birefringent material and a dynamic polarizer. We explain the principle of the proposed method and verify it experimentally.

关键词： three-dimensional display integral imaging birefringence image thickness

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Multiple phases retrieval for optical security systems using random-phase encoding

Multiple phases retrieval for optical security systems using...

引用

Conference on algorithms and systems for Optical Information processing vi

作者： Chang, HT Lu, WC Kuo, CJ Natl Yunlin Univ Sci & Technol Dept Elect Engn Touliu 64002 Taiwan

ISBN: (纸本)0819445568

The technique of the multiple phases retrieval algorithm (MPRA) for designing optical security and verification systems is proposed in this paper. This technique is based on a 4-f optical correlator, which is a common architecture for optical image encryption and verification systems. In the proposed systems, however, two or more phase masks are iteratively retrieved by using the MPRA to obtain the target image. The convergent speed of the iteration process in the MPRA is significantly increased and the recovered image is much more similar to the target one than those in previous approaches. Moreover, the system security is increased since only the pair-wise retrieved phase masks can correctly recover the target images. To avoid carrying two phase keys, one of the phase mask serves as the key and the other phase mask can be stored in the database of the security system as an active lock. Finally, according to our simulation results, the misalignment effects for the phase mask in the Fourier plane are more serious than that in the input plane.

关键词： phase retrieval optical security optical image encryption optical correlator

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Inverse kriging to enhance spatial resolution of imagery

Inverse kriging to enhance spatial resolution of imagery

引用

Conference on algorithms and systems for Optical Information processing vi

作者： Petrie, GM Heasler, PG Perry, EM Thompson, SE Daly, DS Pacific NW Natl Lab Richland WA 99352 USA

ISBN: (纸本)0819445568

We describe a unique approach to image resolution enhancement, inverse kriging (IK), which takes advantage of the spatial relationship between high- and low-resolution images within an area of overlap. Once established, this mathematical relationship then can be applied across the entire low-resolution image to significantly sharpen the image. The mathematical relationship uses the spatial correlations within the low-resolution image and between the low and high spatial-resolution imagery. Two of the most important requirements of the technique are that the images be coregistered well within the resolution of the larger pixels and that the spatial structure of the training area (where the spatial correlation statistics are computed) is similar to the structure of the remaining image area where it will be applied. Testing was performed using same-sensor and multi-sensor imagery. We show results that indicate that the method does improve the low spatial-resolution imagery. The selection of a training area spatial structure similar to the area being processed is important, as areas with different spatial structure (e.g., vegetation versus buildings and roads) will produce poor results. Comparisons with bilinear interpolation demonstrate that IK could be used as an improved interpolation tool, for example, in the image-registration process.

关键词： image sharpening image interpolation image fusion

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Fast algorithm of byte-to-byte wavelet transform for image compression applications

Fast algorithm of byte-to-byte wavelet transform for image c...

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Conference on algorithms and systems for Optical Information processing vi

作者： Pogrebnyak, O Azuela, JHS Ramírez, PM IPN CIC Mexico City 07738 DF Mexico

ISBN: (纸本)0819445568

A new fast algorithm of 2D DWT transform is presented. The algorithm operates on byte represented images and performs image transformation with the Cohen-Daubechies-Feauveau wavelet of the second order. It uses the lifting scheme for the calculations. The proposed algorithm is based on the "checkerboard" computation scheme for nonseparable 2D wavelet. The problem of data extension near the image borders is resolved computing ID Haar wavelet in the vicinity of the borders. With the checkerboard splitting.. at each level of decomposition only one detail image is produced that simplify, the further analysis for data compression. The calculations are rather simple, without any floating point operation allowing the implementation of the designed algorithm in fixed point DSP processors for fast. near real time processing. The proposed algorithm does not possesses perfect restoration of the processed data because of rounding that is introduced at each level of decomposition/restoration to perform operations with byte represented data. The designed algorithm was tested on different images. The criterion to estimate quantitatively the quality of the restored images was the well known PSNR. For the visual quality estimation the error maps between original and restored images were calculated. The obtained simulation results show that the visual and quantitative quality of the restored images is degraded with number of decomposition level increasing but is sufficiently high even after 6 levels. The introduced distortion are concentrated in the vicinity of high spatial activity details and are absent in the homogeneous regions. The designed algorithm can be used for image lossy compression and in noise suppression applications.

关键词： quincunx wavelets non-linear wavelet transform image compression noise suppression

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A reconfigurable vision system for real-time applications

A reconfigurable vision system for real-time applications

引用

Conference on Real-Time Imaging vi

作者： Torres-Huitzil, C Arias-Estrada, M Natl Inst Astrophys Opt & Elect Dept Comp Sci Puebla 72000 Mexico

ISBN: (纸本)0819444065

Recently, a growing community of researchers has used reconfigurable systems to solve computationally intensive problems. Reconfigurability provides optimized processors for systems on chip designs, and makes easy to import technology to a new system through reusable modules. The main objective of this work is the investigation of a reconfigurable computer system targeted for computer vision and real-time applications. The system is intended to circumvent the inherent computational load of most window-based computer vision algorithms. It aims to build a system for such tasks by providing an FPGA-based hardware architecture for task specific vision applications with enough processing power, using the minimum amount of hardware resources as possible, and a mechanism for building systems using this architecture. Regarding the software part of the system, a library of pre-designed and general-purpose modules that implement common window-based computer vision operations is being investigated. A common generic interface is established for these modules in order to define hardware/software components. These components can be interconnected to develop more complex applications, providing an efficient mechanism for transferring image and result data among modules. Some preliminary results are presented and discussed.

关键词： reconfigurability computer vision real-time processing

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Generation and fusion of multiple image representations in automatic corrosion detection algorithms used with shipboard tank video inspection systems

Generation and fusion of multiple image representations in a...

引用

Conference on Sensor Fusion - Architectures, algorithms, and Applications vi

作者： Nelson, BN Slebodnick, P Lemieux, EJ Krupa, M Preisser, R Lucas, K GEO CTRS INc Newton Ctr MA 02459 USA

ISBN: (纸本)0819444812

Coatings damage in shipboard tanks is presently assessed using "Certified Coatings Inspectors". Prior to a coatings inspector entering a tank, the tank must be emptied and certified "gas free". These requirements combined with the limited number of certified coatings inspectors available at shipyards and Naval Bases significantly increases the cost and the logistical requirements associated with performing shipboard tank inspections. There is additionally significant variation in damage assessments made by different inspectors. To overcome these difficulties, the Naval Research Laboratory has developed two video inspection systems that obviate requirements for both certifying tanks gas free and for emptying the tank prior to performing an inspection. These systems also obviate requirements for inspector presence during tank inspections. The Naval Research Laboratory has also developed an automatic corrosion detection algorithm. The corrosion detection algorithm currently employs two independent algorithms that individually assess the tank coatings damage. The independent damage assessments are than fused to attain a single coatings damage value. In testing performed to date, it has been shown that the corrosion detection algorithm significantly reduces the effect of inspector-to-inspector variability and provides an accurate assessment of tank coatings damage. This in turn makes it significantly easier to prioritize ship maintenance.

关键词： information fusion image processing automatic corrosion detection

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Filter construction for topological track association and sensor registration

Filter construction for topological track association and se...

引用

Conference on algorithms and systems for Optical Information processing vi

作者： Stanek, CJ Javidi, B Skorokhod, A Yanni, P ANZUS San Diego CA 92131 USA

ISBN: (纸本)0819445568

Correlation engines have been evolving since the implementation of radar. Here, correlation refers to association, which in this context is track-to-track association. In modem sensor fusion architectures, correlation and sensor registration are required to produce common, continuous, and unambiguous tracks of all objects in the surveillance area [1]. The objective is to provide a unified picture of the theatre or area of interest to battlefield decision makers. This unified picture has many names, but is most commonly referred to as a Single Integrated Picture (SIP). A related process, known as sensor registration or gridlock filtering (gridlocking), refers to the reduction in navigation errors and sensor misalignment errors so that one sensor's track data can be accurately transformed into another sensor's coordinate system. As platforms gain multiple sensors, the correlation and gridlocking of tracks become significantly more difficult. Current correlation technology revolves around likelihood ratio theory and the assignment algorithm to resolve association ambiguities. While a Bayes classifier is the best classifier, all classifiers potentially lead to classification errors. The performance, with respect to misclassification, is usually expressed via the operating characteristic curve. When the observed feature vector has a high dimension, finding the class densities can be difficult. Even if these densities are available, we should remember that no classifier can perform perfectly when the class distributions overlap. Sensor registration is typically accomplished with some type of least-squares algorithm, such as the Kalman filtering technique, which attempts to locate the best bias error vector estimate from a set of associated/fused track pairs. In this paper, we examine the track association and sensor registration problem in terms of several correlation classifiers, the most famous of these being the matched filter. Thus, we seek some unification between th

关键词： correlation gridlock topology Bayesian image-based likelihood ratio optical constellation

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A multi DSP board for real time SAR processing using the HiPAR-DSP 16

A multi DSP board for real time SAR processing using the HiP...

引用

IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2002)/24th Canadian Symposium on Remote Sensing

作者： Simon-Klar, C Friebe, L Kloos, H Lieske, H Hinrichs, W Pirsch, P Inst Microelect Circuits & Syst D-30167 Hannover Germany

ISBN: (纸本)078037536X

At the University of Hannover a fully programmable DSP, the HiPAR-DSP 16, was developed. This HiPAR-DSP 16 contains 16 parallel datapaths and a 2-dimensional memory adapted to image processing algorithms. For real time SAR processing high computational power is required. Therefore a multi DSP board with 6 HiPAR-DSP 16 is developed. The high performance of up to 28 GOPS enables a SAR processing in real time. The calculation time ior the wk-algorithm running on this board was estimated. For blocks of 4096 lines with 4096 8 bit complex samples real time processing is possible to a pulse repetition frequency (PRF) of 1200 Hz. Due to a low power consumption and the small size of 160 x 230 mm 2 of this board the use in on-board systems is predestinated.

关键词： Radar imaging

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