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An error robust macro-block mode decision for H.26L stream 1

An error robust macro-block mode decision for H.26L stream

引用

1st International conference on communications, Circuits and Systems, ICCCAS 2002

作者： Ma, Honghua Yu, Songyu Zeng, Zhaoping Institute of Image Communications and Information Processing Shanghai Jiaotong University Shanghai200030 China

ISBN: (纸本)0780375475

With the rapid development of the Internet, more and more attention is focused on IP video streaming. We introduce an RD optimal macro-block mode decision scheme for the new H.26L video stream. Based on the statistical error propagation model of the Internet and the unequal NAL packet of H.26L, our new scheme can be more error robust than those currently adopted in the H.26L test mode. © 2002 IEEE.

关键词： Video streaming

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Adaptation, high-level vision, and the phenomenology of perception

Adaptation, high-level vision, and the phenomenology of perc...

引用

conference on Human Vision and Electronic Imaging VII

作者： Webster, MA Univ Nevada Dept Psychol Reno NV 89557 USA

ISBN: (纸本)0819444022

To what extent do we have shared or unique visual experiences? This paper examines how the answer to this question is constrained by known processes of visual adaptation. Adaptation constantly recalibrates visual sensitivity so that our vision is matched to the stimuli that we are currently exposed to. These processes normalize perception not only to low-level features in the image, but to high-level, biologically relevant properties of the visual world. They can therefore strongly impact many natural perceptual judgments. To the extent that observers are exposed to and thus adapted by a different environment, their vision will be normalized in different ways and their subjective visual experience will differ. These differences are illustrated by considering how adaptation can influence human face perception. To the extent that observers are exposed and adapted to common properties in the environment, their vision will be adjusted toward common states, and in this respect they will have a common visual experience. This is illustrated by reviewing the effects of adaptation on the perception of image blur. In either case, it is the similarities or differences in the stimuli and not the intrinsic similarities or differences in the observers - which determine the relative states of adaptation. Thus at least some aspects of our private internal experience are controlled by external factors that are accessible to objective measurement.

关键词： visualization visual system Retina Cones Environmental sensing image processing Eye Facial recognition systems Imaging arrays Light sources and illumination

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Packet loss recovery hybrid scheme for image multicast applications

Packet loss recovery hybrid scheme for image multicast appli...

引用

2002 IEEE International conference on Acoustic, Speech and Signal processing

作者： Lawabni, Abed Elhamid Tewfik, Ahmed H. Dept. of Elec. and Comp. Eng. University of Minnesota Minneapolis MN 55455 United States

ISBN: (纸本)0780374029

In real-time multicast communication scalability, reliability, feedback implosion, and packet loss recovery are of paramount importance. In this work we have developed an efficient feedback-free, entirely receiver-driven, and reliable visual information delivery hybrid scheme (SIGMA-EC) for multicast applications over unreliable communication networks, that requires no per-receiver status at the sender. Our scheme's encoding and decoding processing time is an order of magnitude faster than conventional FEC-based loss recovery schemes. Among other attractive features, the reconstructed image quality gets progressively better. Furthermore, we obtain all these advantages using a remarkably simple structure, both conceptually as well as computationally.

关键词： Multicasting

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Multispectral image sharpening using a shift-invariant wavelet transform and adaptive processing of multiresolution edges

Multispectral image sharpening using a shift-invariant wavel...

引用

conference on visual Information processing XI

作者： Lemeshewsky, GP US Geol Survey Reston VA 20192 USA

ISBN: (纸本)0819444863

Enhanced false color images from mid-IR, near-IR (NIR), and visible bands of the Landsat thematic mapper (TM) are commonly used for visually interpreting land cover type. Described here is a technique for sharpening or fusion of NIR with higher resolution panchromatic (Pan) that uses a shift-invariant implementation of the discrete wavelet transform (SIDWT) and a reported pixel-based selection rule to combine transform coefficients. There can be contrast reversals (e.g., at soil-vegetation boundaries between NIR and visible band images) and consequently degraded sharpening and edge artifacts. To improve performance for these conditions, I used a local area-based correlation technique originally reported for comparing image-pyramid-derived edges for the adaptive processing of wavelet-derived edge data. Also, using the redundant data of the SIDWT improves edge data generation. There is additional improvement because sharpened subband imagery is used with the edge-correlation process. A reported technique for sharpening three-band spectral imagery used forward and inverse intensity, hue, and saturation transforms and wavelet-based sharpening of intensity. This technique had limitations with opposite contrast data, and in this study sharpening was applied to singleband multispectral-Pan image pairs. Sharpening used simulated 30-m NIR imagery produced by degrading the spatial resolution of a higher resolution reference. Performance, evaluated by comparison between sharpened and reference image, was improved when sharpened subband data were used with the edge correlation.

关键词： image sharpening edge correlation shift-invariant wavelet transform NIR

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Single instruction set Architectures for image processing

Single instruction set Architectures for image processing

引用

conference on Reconfigurable Technology - FPGAs and Reconfigurable Processors for Computing and communications IV

作者： Laplante, P Gilreath, W Penn State Great Valley Malvern PA 19355 USA

ISBN: (纸本)0819446467

For more than fifty years, computer engineers have sought to construct minimal computers using only a single instruction computer. While it might appear to be a simple academic exercise, remarkably, a rich computation paradigm can be developed using this approach, with important applications and implications in reconfigurable, chemical, optical and biological computing. More recently, the widespread use of the Field Programmable Gate Array (FPGA) has made such an approach not only desirable, but also practical. In this paper the history and motivation behind single instruction or one instruction computing (OISC) is reviewed. It is then shown how the paradigm can be used to implement a variety of imaging operations efficiently. Finally, a practical application and future work in languages and tools are presented.

关键词： OISC one-instruction computing image processing reconfigurable computing

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Channel equalization for multiuser chaotic communications systems

Channel equalization for multiuser chaotic communications sy...

引用

2002 IEEE International conference on Acoustic, Speech and Signal processing

作者： Ciftci, Mahmut Williams, Douglas B. Ctr. for Signal and Image Processing Georgia Institute of Technology Atlanta GA 30332-0250 United States

ISBN: (纸本)0780374029

In a multiuser chaotic communications scheme, each user's information is modulated with a chaotic system and then transmitted independently over a common communication channel. The receiver sees the superposition of the distorted transmitted signals with additive noise. In this paper, a novel channel equalization algorithm is proposed for multiuser chaotic communications systems where each user's information is encoded using symbolic dynamics. The goal is to recover the chaotic signal being sent by each individual user so that its information can be estimated. This paper begins with the symbolic dynamics representation of chaotic systems being exploited to enable the representation of the multiuser chaotic system with an equivalent trellis diagram. Then, the trellis diagram is expanded to accommodate FIR channel distortions. Finally, the Viterbi algorithm is used to obtain maximum-likelihood estimates of the transmitted sequences. The performance of this algorithm in terms of bit-error rate (BER) is simulated for different channel distortions.

关键词： Communication systems

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Software generation of address-event-representation for interchip images communications

Software generation of address-event-representation for inte...

引用

Proceedings of the 2002 28th Annual conference of the IEEE Industrial Electronics Society

作者： Linares-Barranco, Alejandro Jiménez, Gabriel Civit, A. Sevillano, J.L. Paz, R. Arquitectura y Tecn. de Computadores Universidad de Sevilla ETS Ingenieria Informatica Av. Reina Mercedes s/n 41012-Sevilla Spain

Address-Event-Representation (AER) is a communications protocol for transferring images between chips, originally developed for bio-inspired image processing systems. Such systems may consist of a complicated hierarchical structure with many chips that transmit images among them in real time, while performing some processing (for example, convolutions). In developing AER based systems it is very convenient to have available some kind of means of generating AER streams from on-computer stored images. In this paper we present a method for generating AER streams in real time from images stored in a computer's memory. The method exploits the concept of linear feedback shift register random number generators. This method has been tested by software and compared to other possible algorithms for generating AER streams. It has been found that the proposed method yields a minimum error with respect to the ideal situation. A hardware platform that exploits this technique is currently under development.

关键词： image processing

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Streaming MPEG4 textures: A 3D view-dependent approach

Streaming MPEG4 textures: A 3D view-dependent approach

引用

IEEE International conference on Acoustics, Speech, and Signal processing

作者： Delfosse, E Lafruit, G Bormans, J IMEC B-3001 Louvain Belgium

ISBN: (纸本)0780374029

One of the key functionalities in today's multimedia applications is streaming. However unlike video, streaming 3D content remains rare, especially for textures. In this paper, we present an intelligent, view-dependent approach for streaming and decoding MPEG-4 textures in order to save network and platform resources, while minimizing the perceived quality loss. Different regions of the 3D object's texture are independently decoded up to a desired quality. Whenever viewing conditions change, newly visible texture regions are transmitted and/or already transmitted regions are refined. This 3D view-dependent decoding of MPEG-4 textures is possible by exploiting the error resilience feature in the MPEG-4 texture-coding tool, It allows a high flexibility (i.e. number of possible quality levels) but at the cost of an increased bitstream size. However, since streaming is possible, the transmission of the bitstream is spread over time, reducing the instantaneous bandwidth and processing cost.

关键词： code standards telecommunication standards image texture visual communication multimedia communication image coding decoding MPEG-4 texture streaming 3D view-dependent approach multimedia applications intelligent approach platform resources network resources 3D object texture viewing conditions visible texture regions 3D view-dependent decoding error resilience MPEG-4 texture-coding tool bitstream size bitstream transmission bandwidth reduction processing cost reduction

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Lagrangian coder control and comparison of MPEG-4 and H.26L video codecs

Lagrangian coder control and comparison of MPEG-4 and H.26L ...

引用

4th International ITG conference on Source and Channel Coding

作者： Schwarz, Heiko Wiegand, Thomas Image Processing Department Heinrich Hertz Institute Berlin Germany

A rate-distortion-optimized coder control for block-based hybrid video coders using Lagrangian techniques is presented. It was successfully applied to the ISO/IEC standard MPEG-4 visual and the current ITU-T project H.26L. In both cases, the improved encoding strategy provides visible performance gains compared to the previous encoding strategies of MPEG-4 visual and H.26L, respectively. Furthermore, this unified coder control allows a fair comparison between the MPEG-4 visual and the H.26L syntax in terms of coding efficiency. Objective (PSNR) and subjective results of this comparison are presented.

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Multi-Resolution Enhancement of Photographic images

Multi-Resolution Enhancement of Photographic Images

引用

Final Program and Proceedings: IS and T's 55th Annual conference

作者： Velde, Koen Vande Delabastita, Paul A. Agfa-Gevaert Mortsel Belgium

Multi-resolution enhancement provides a powerful tool for enhancing photographic images. These images are acquired with a large dynamic range and a good signal-to-noise ratio. A problem arises in reproducing such images on a medium (CRT, paper...). There are the restrictions of the recording apparatus (number of reproducible intensity levels, color gamut, and color resolution...) as well as environmental factors (flare, light level...). Apart from these technical restrictions, there are also fundamental limitations to the capabilities of the human visual system. We present a multi-resolution method that adjusts the image such that it uses the available dynamic range in a more efficient way and faint image details are visualized better, even in dark and light portions of the image. The enhancement is done in a way that preserves the natural look of the image. The algorithm is robust enough to process photographic images in batch, without tweaking the processing parameters per image. The main message of this paper is that multi-resolution image enhancement, originally developed for radiological imaging, can be applied successfully on photographic color images.

关键词： image enhancement

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