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检索条件"任意字段=Visual Communications and Image Processing II 1987"

共 187 条记录，以下是11-20 订阅

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The importance of spatial frequency and orientation in image decomposition and coding

The importance of spatial frequency and orientation in image...

引用

visual communications and image processing ii 1987

作者： Shlomot, E. Zeevi, Y.Y. Pearlman, W.A. Technion - Israel Institute of Technology Department of Electrical Engineering Haifa32000 Israel R.P.I. - Rensselaer Polytechnic Institute Electrical Computer and Systems Engineering Dept. TroyNY12180-3590 United States

A scheme is proposed for image decomposition into components having spatial frequency band and orientation selectivity characteristic of the visual system. The Hexagonal-discrete-Fourier-transform (HDFT) of an hexagonally sampled image is partitioned into 36 bands, each of one octave and 30 degrees of angular orientation. Computational results of such image decomposition exhibit self-similarity of edge distribution, along the pyramidal structure of the spatial frequency components, in each of the six orientations. A combination of coding scheme, which reduces the apparent redundancy, and efficient bit reallocation procedure achieves good image reconstruction with data transmission rate of about 1.0 bits/pixel. © 1987 SPIE. All rights reserved.

关键词： Discrete Fourier transforms

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SUPER HIGH DEFINITION image-processing ON A PARALLEL SIGNAL-processing SYSTEM

SUPER HIGH DEFINITION IMAGE-PROCESSING ON A PARALLEL SIGNAL-...

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CONF ON visual communications AND image processing : visual communications

作者： FUJii, T SAWABE, T OHTA, N ONO, S NTT Transmission Systems Labs. (Japan)

ISBN: (纸本)0819407429

This paper describes a new parallel image processing system called "NOVI-ii HiPIPE" that manipulates super high definition (SHD) images. This system consists of 128 processing nodes, 4 I/O nodes for image storage, and 4 I/O nodes for SHD still image display. It provides extremely high computational power and high throughput rates for SHD image processing. This system can transfer image data to the newly developed Super Frame Memory (Super FM) for SHD moving image display via the Ultra-network. A new Vector Processor (VP), which has a peak performance of 100 MFlops, is developed and the performance of an engineering sample version of this chip is checked. One VP will be installed in each processing node as the DSP engine and a total system performance of 12.8 Gflops (peak performance) is expected from NOVI-ii HiPIPE. Using this system, various image coding schemes and computer graphics techniques can be easily explored in spite of the huge amount of data that must be treated.

关键词： image processing Personal digital assistants visual communications Digital signal processing Signal processing image compression Fermium Frequency modulation Telecommunications Parallel processing

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Experiments on image coding with distortion below visual threshold 2

Experiments on image coding with distortion below visual thr...

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visual communications and image processing ii 1987

作者： Dubois, E. Rahmouni, Y. Lortie, F. INRS Telecommunications 3 Place du Commerce VerdunQCH3E 1H6 Canada

Two quantization methods for high quality image coding are presented. The goal in both methods is to keep subjective distortion below visual threshold. The first method is a discrete cosine transform coding system. The coefficients of the transformed blocks are quantized with a set of uniform quantizers with step sizes determine by a parametric function. Subjective experiments were carried out to determine the parameter values which minimize output entropy while keeping distortion at about the threshold of perceptibility. The second method is a vector quantizer on small image blocks. A structured quantizer defined by a few parameters is described, and approximate parameter values for transparent coding are given. © 1987 SPIE. All rights reserved.

关键词： image coding

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A video-rate CCD two-dimensional cosine transform processor

A video-rate CCD two-dimensional cosine transform processor

引用

visual communications and image processing ii 1987

作者： Chiang, A.M. Lincoln Laboratory MIT LexingtonMA02173 United States

The need for transmitting an image through a low data rate channel has led to the development of various image data compression techniques. Recently, transform image coding based on the discrete cosine transform (DCT) algorithm has been proven to be a near optimum method for good quality, low data rate image transmission [1],[2]. In this paper, a CCD two-dimension DCT [3] device structure based on the recently developed one dimension CCD DCT device [4] will be reviewed. The CCD DCT device computes a 16-point cosine transform in 100 ns. The device structure is based on the vector-matrix product algorithm and implemented by using a bank of 256 fixed-weight multipliers. 60-dB dynamic range, -40-dB harmonic distortion has been achieved by the DCT device. Clocked at 10 MHz, the device is performing 5 billion computations per second and dissipates only 700 mW. The speed, power, weight and through-put rate advantages offered by the CCD technology make it ideal to be used in a low cost image transform CODECL [2].

关键词： Charge-coupled devices image compression image processing image transmission image quality Analog electronics Fourier transforms visual communications Distortion Video processing

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A pyramid of image generating functions

A pyramid of image generating functions

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visual communications and image processing ii 1987

作者： Hason, B. Zeevi, Y.Y. Technion - Israel Institute of Technology Faculty of Electrical Engineering Haifa32000 Israel

An image is modeled by a two-parameter stochastic process generated by splitting a pixel into a block of 2 × 2 pixels thereby obtaining a higher resolution image. This sequential reproduction process is achieved by using a sequence of random variables as multipliers. In the analysis of image structure we apply the model in the reverse order, i.e. estimate the sequence of random variables which generates the image. The size of matrices representing the stochastic processes show a pyramidal structure when increasing or decreasing the resolution. The features characterizing an image are provided by analysis of the properties of estimated stochastic processes at each level of the pyramid, and by comparison of properties characteristic of consecutive levels of the pyramid. As a byproduct of this image structure analysis, our approach suggests a new method for data compression. © 1987 SPIE. All rights reserved.

关键词： Random processes

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Systolic applications for digital image/video processing applications

Systolic applications for digital image/video processing app...

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visual communications and image processing ii 1987

作者： Kung, S.Y. Stewart, R.W. Lo, S.C. Dept. of Electrical Engineering Princeton University PrincetonNJ08544 United States University of Strathclyde United Kingdom

This paper uses a powerful three stage mapping methodology to realize highly concurrent systolic array processor architectures for image processing. The paper addresses the issues of designing special purpose systolic image enhancement processors for edge detection and median filtering and designing configurable general purpose systolic signal processors for Kalman filtering and artificial neural networks. The latter two arrays can then be specifically configured for image restoration and other image processing problems. © 1987 SPIE. All rights reserved.

关键词： image enhancement

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A pel-recursive Wiener-based displacement estimation algorithm for interframe image coding applications

A pel-recursive Wiener-based displacement estimation algorit...

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visual communications and image processing ii 1987

作者： Biemond, J. Looijenga, L. Boekee, D.E. Delft University of Technology Dept. of Electrical Engineering P.O. Box 5031 GA Delft2600 Netherlands

In this paper a pel-recursive Wiener-based displacement estimation algorithm is introduced for interframe image coding applications. This algorithm is based on the assumption that both the so-called update and the linearization error are samples of stochastic processes. It provides a linear least-squares estimate and has proven to be very successful to compensate motion in some typical video conferencing scenes. A comparison of the Wiener-based algorithm with some other well-known pel-recursive techniques shows the favourable behavior of the Wiener algorithm with respect to robustness, stability and convergence. © 1987 SPIE. All rights reserved.

关键词： image coding

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Parallel architecture for the efficient use of memory subsystems in image processing

Parallel architecture for the efficient use of memory subsys...

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visual communications and image processing ii 1987

作者： Fong, Yu-Shan Faruque, Abdullah ECE Department Clarkson University PotsdamNY13676 United States

Currently there exist many parallel computer architecture for image processing applications. The main goal of these architecture is to carry out image processing work in a highly parallel manner so that the processing time is short. In most of these architectures the processing elements are used very efficiently, but not the memory subsystems. Thus although the processing is done in parallel to ensure better response time, the available bandwidth is limited, in most cases, by the memory I/O operations. This paper introduces an MIMD (multiple instruction multiple data stream) type of parallel multimicroprocessor architecture for image processing. Our proposed architecture is one in which both the processors and the memory subsystems are kept as busy as possible in order to obtain faster response time and proper utilization of the hardware. The proposed architecture consists of an array of processing Elements (PEs), a System Control Unit, and the main memory of the system. Each PE contains two Central processing Unit (CPU), one is responsible for execution and the other is responsible for all memory operations. The overall response time of a task is faster because we divide the actual execution and the memory operation into two separate entities and carry them out concurrently. This is an improvement over the conventional architecture. © 1987 SPIE. All rights reserved.

关键词： Parallel architectures

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Improved edge-based image segmentation

Improved edge-based image segmentation

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visual communications and image processing ii 1987

作者： Healy, Donald J. Lockheed-Georgia Company Advanced Research Organization 86 South Cobb Drive MariettaGA30063 United States

An improved segmenter has been developed which partitions a monochrome image into homogeneous regions using local neighborhood operations. Perkin's well-known edge-based segmenting algorithm [1] is used to partition those portions of an image with little detail (low edge density) into regions of uniform intensity. A technique is introduced which segments the remainder of the image to reveal details that were previously lost. Region merging is then performed by removing selected boundary pixels that separate sufficiently similar (e.g., in average intensity) regions subject to the constraint that the boundary pixel quality (e.g. edge strength) is below a selected threshold. Region merging is repeated using less and less restrictive merging criteria until the desired degree of segmentation (e.g. number of regions) is obtained. © 1987 SPIE. All rights reserved.

关键词： Pixels

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Fractal image models and object detection

Fractal image models and object detection

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visual communications and image processing ii 1987

作者： Stein, Michael C. Analytic Sciences Corporation 55 Walkers Brook Drive ReadingMA01867 United States

This paper discusses a new technique for object detection that uses fractals to model the natural background in a visible image. Our technique is based on the fact that fractalbased models have been found to be good models for natural objects as well as images of natural objects. On the other hand, man-made objects are decidedly not self-similar and therefore fractal-based models are not good models for man-made objects and their images. The technique adaptively fits a fractal-based model and a 2-D autoregressive model over the image and the fractal dimension and model-fit errors are used to identify regions of anomalous dimension and high error. Thus the technique uses a dual approach to object detection by modeling and deemphasizing the natural background instead of explicitly modeling and identifying the man-made object. Results are shown for a real image. © 1987 SPIE. All rights reserved.

关键词： Object detection

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