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检索条件"任意字段=Visual Communications and Image Processing 1993"

共 198 条记录，以下是21-30 订阅

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MULTIFOCUS SYNTHESIS AND ITS APPLICATION TO 3-D image CAPTURING

MULTIFOCUS SYNTHESIS AND ITS APPLICATION TO 3-D IMAGE CAPTUR...

引用

Meeting on visual communications and image Communication 93

作者： YAMAGUCHI, H TEXAS INSTRUMENTS INC TSUKUBA R&D CTRTSUKUBAIBARAKI 305JAPAN

ISBN: (纸本)0819413690

A new technique for the high-resolution image synthesis called multifocus synthesis is presented. As an important extension, the 3-D real-world image capture is discussed. In the approach, the object image is taken at a number of focal distances by a single camera placed at a fixed position. Each of these images are then converted into the multiresolution using the optimized QMF. The resultant volume of coefficients are then analyzed and 3-D distance information is computed.

关键词： 3D image processing Cameras Linear filtering 3D displays image processing Neural networks Video Holography image analysis Wavelets

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image SEQUENCE CODING BY MULTIGRID MOTION ESTIMATION AND SEGMENTATION BASED CODING OF PREDICTION ERRORS

IMAGE SEQUENCE CODING BY MULTIGRID MOTION ESTIMATION AND SEG...

引用

Meeting on visual communications and image Communication 93

作者： LI, W DUFAUX, F SWISS FED INST TECHNOL SIGNAL PROC LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819413690

This paper presents an innovative video coding system which processes appropriately motion information by an improved motion estimation algorithm and a segmentation based coding of displaced frame differences (DFD). The proposed multigrid motion estimation algorithm with adaptive mesh leads to more uniform and accurate motion vectors, and a lower overhead information. A morphological segmentation algorithm is proposed to code DFD by sending contours and quantized high energy regions. The method is coding oriented, and has the potential of graceful degradation. Simulation results show outstanding performances of the proposed codec for image sequences in CCIR 601 format.

关键词： image segmentation Motion estimation image compression image processing algorithms and systems Video coding Evolutionary algorithms image processing Information operations Data processing Signal processing

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A REAL-TIME REPROGRAMMABLE LOW-LEVEL image-processing - EDGE-DETECTION AND EDGE TRACKING ACCELERATOR

A REAL-TIME REPROGRAMMABLE LOW-LEVEL IMAGE-PROCESSING - EDGE...

引用

Meeting on visual communications and image Communication 93

作者： MERIBOUT, M HOU, KM UNIV TECHNOL COMPIEGNE HEURIST & DIAGNOST SYST COMPLEXESCNRSURA 817F-60206 COMPIEGNEFRANCE

ISBN: (纸本)0819413690

Currently, in image processing, segmentation algorithms compromise between real time video rate processing and accurate results. In this paper, we present an efficient and not recursive algorithm filter originated from Deriche filter. This algorithm is implemented in hardware by using FPGA technology. Thus, it permits video rate edge detection. In addition, the FPGA board is used as edge tracking accelerator, it allows to greatly reduce execution time by avoiding to scan the whole image. We also present the architecture of our vision system dedicated to build 3D scene every 200ms.

关键词： Edge detection

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EFFICIENT CODING METHOD FOR STEREO image PAIRS

EFFICIENT CODING METHOD FOR STEREO IMAGE PAIRS

引用

Meeting on visual communications and image Communication 93

作者： LI, W SALARI, E UNIV TOLEDO DEPT ELECT ENGNTOLEDOOH 43606

ISBN: (纸本)0819413690

In this paper, a new coding method for stereo image pairs is presented. Disparity vectors are estimated with variable size block matching algorithm which requires fewer overhead bits for transmission. The different statistical properties between original images and disparity- compensated images are discussed. The efficiency of DCT compression is fully utilized through adaptively switching between the original image data and the disparity-compensated image data. Simulation results demonstrate that the proposed scheme performs well.

关键词： image compression image quality image processing Video coding Computer programming Digital filtering Switching Video Video compression Navigation systems

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ENHANCEMENT OF RETINAL imageS - A CRITICAL-EVALUATION OF THE TECHNOLOGY

ENHANCEMENT OF RETINAL IMAGES - A CRITICAL-EVALUATION OF THE...

引用

Meeting on visual communications and image Communication 93

作者： PELI, E HARVARD UNIV SCH MEDSCHEPENS EYE RES INSTBOSTONMA 02114

ISBN: (纸本)0819413690

Evaluation of retinal images is essential to modern ophthalmic care. With the advent of image processing equipment, digital recording and processing of retinal images is starting to replace the standard film based fundus photography. The ability to enhance images is cited as one of the major benefits of this expensive technology. This paper critically reviews the practices employed in the image enhancement literature. It is argued that the papers published to date have not presented convincing evidence regarding the diagnostic value of retinal image enhancement. The more elaborate studies in radiology suggest, at best, modest diagnostic improvement with enhancement. The special difficulties associated with the demonstration of an improved diagnosis in ophthalmic imaging are discussed in terms of the diagnostic task and the selection of study populations.

关键词： image enhancement image processing Diagnostics Photography Radiology Eye Visibility image filtering Nonlinear filtering Angiography

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COMPUTATIONAL MORPHOLOGY AND REPRESENTATION OF OPERATORS BETWEEN COMPLETE LATTICES

COMPUTATIONAL MORPHOLOGY AND REPRESENTATION OF OPERATORS BET...

引用

Meeting on visual communications and image Communication 93

作者： CUCIUREANZAPAN, C DOUGHERTY, ER ROCHESTER INST TECHNOL CTR IMAGING SCIROCHESTERNY 14623

ISBN: (纸本)0819413690

The representations of translation-invariant mappings in the context of computational morphology are in terms of elementary binary erosions and dilations. The general representations in the context of complete lattices are in terms of abstract dilations and antidilations. The present paper considers the relationship between the specialized computational and general lattice representations. The computational and lattice-based representations are directly demonstrated to be equivalent in the computational setting.

关键词： Binary data Lithium Nonlinear filtering Transform theory image filtering Mathematical morphology Optimization (mathematics) Space operations Error analysis Nonlinear image processing

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JOINT MULTIGRID ESTIMATION OF 2D MOTION AND OBJECT BOUNDARIES USING BOUNDARY PATTERNS

JOINT MULTIGRID ESTIMATION OF 2D MOTION AND OBJECT BOUNDARIE...

引用

Meeting on visual communications and image Communication 93

作者： BUSCHMANN, R UNIV HANNOVER INST THEORET NACHRICHTENTECH & INFORMATIONSVERARBEITUNGD-30167 HANNOVERGERMANY

ISBN: (纸本)0819413690

For the improvement of joint estimation of 2D motion and 2D object boundaries an optimization procedure based on multigrid and pattern processing is presented. In this procedure an iterative optimization is applied using grids of different resolution, starting with a global estimation of the motion in the coarsest grid. Improvements are achieved by the introduction of boundary patterns, which are obtained from boundary estimates from coarser grids to be used in the finer ones. It is shown that the developed technique compared to a hierarchical blockmatching technique leads to a significant reduction of the mean square error between compensated and original images at object boundaries.

关键词： Motion estimation image processing Cameras Optimization (mathematics) 3D image processing Algorithm development Binary data Stochastic processes Algorithms Error analysis

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REGULARIZED RECONSTRUCTION TO REMOVE BLOCKING ARTIFACTS FROM BLOCK DISCRETE COSINE TRANSFORM COMPRESSED imageS

REGULARIZED RECONSTRUCTION TO REMOVE BLOCKING ARTIFACTS FROM...

引用

Meeting on visual communications and image Communication 93

作者： YANG, YY GALATSANOS, NP KATSAGGELOS, AK IIT DEPT ELECT & COMP ENGNCHICAGOIL 60616

ISBN: (纸本)0819413690

In most block-transform based codecs (coder-decoder) the compressed image is reconstructed using only the transmitted data. In this paper, the reconstruction is formulated as a regularized image recovery problem where both the transmitted data and prior knowledge about the properties of the original image are used. This is accomplished by minimizing an objective function, using iterative algorithms, which captures the smoothness properties of the original image. Experimental results are presented which demonstrate that the proposed regularized algorithms yield reconstructed images with superior quality, both visually and using objective distance metrics, to that of traditional decoders that use only the transmitted transform coefficients.

关键词： image compression Reconstruction algorithms image restoration Distance measurement visualization Matrices Quantization Chlorine Evolutionary algorithms visual communications

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NONLINEAR-REGRESSION FOR image-ENHANCEMENT VIA GENERALIZED DETERMINISTIC ANNEALING

NONLINEAR-REGRESSION FOR IMAGE-ENHANCEMENT VIA GENERALIZED D...

引用

Meeting on visual communications and image Communication 93

作者： ACTON, ST BOVIK, AC UNIV TEXAS DEPT ELECT & COMP ENGNVIS SYST LABAUSTINTX 78712

ISBN: (纸本)0819413690

We introduce new classes of image enhancement techniques that are based on optimizing local characteristics of the image. Using a new optimization technique for nonconvex combinatorial optimization problems, generalized deterministic annealing (GDA), we compute fuzzy nonlinear regressions of noisy images with respect to characteristic image sets defined by certain local image models. The image enhancement results demonstrate the powerful approach of nonlinear regression and the low-cost, high-quality optimization of GDA.

关键词： image enhancement Digital filtering Annealing Fuzzy logic image processing Optimization (mathematics) Electronic filtering Smoothing Data modeling Nonlinear filtering

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PEDESTRIAN COUNTING SYSTEM ROBUST AGAINST ILLUMINATION CHANGES

PEDESTRIAN COUNTING SYSTEM ROBUST AGAINST ILLUMINATION CHANG...

引用

Meeting on visual communications and image Communication 93

作者： SATO, A MASE, K TOMONO, A ISHII, K NTT Human Interface Labs. (Japan) NTT R&D Information and Patent Ctr. (Japan)

ISBN: (纸本)0819413690

This paper presents a realtime pedestrian counting system based on x-t spacetime image analysis. The system counts the number of pedestrians through the combination of three processes: moving object extraction, object counting by region labeling, and direction detection by flow estimation. In order to extract objects reliably under various illumination changes, we propose new moving objects extraction methods that extract moving regions whose shadows have been eliminated by using adaptive background image reconstruction and the color information processing of the images. For labeling and flow estimation, we use the Ortho-sectioning method that analyzes extracted regions on a spacetime slice image of the original three dimensional volume. Experimental results confirm the robustness of the system against illumination changes.

关键词： RGB color model image processing Binary data Cameras Sensors 3D image processing image analysis Video Data processing image restoration

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