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检索条件"任意字段=Conference on Visual Communications and Image Processing 2005"

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Constrained trellis based rate control scheme for low bit rate video coding

Constrained trellis based rate control scheme for low bit ra...

引用

IEEE International conference on image processing

作者： A. Bist P. Sriram Multimedia Communications Divison Rockwell International Corporation Newport Beach CA USA

We propose a new technique of rate control for very low bit rate video coding for visual telephony. The scheme is optimized for a video coder conforming to the H.263 standard and outperforms the linear rate control scheme used in the test model in terms of visual performance and frame jerkiness at the output. The rate control scheme,is designed for a variable bit-rate and variable frame rate coder. We address the rate allocation problem as a constrained optimization problem and exploit the syntax of H.263 to use a constrained trellis to perform the optimization. Furthermore, we reduce the computations in the trellis search by modeling the rate distortion functions. The resulting bit allocation yields a higher signal to noise ratio, and a better correlation between the quantization step size and the block energies, with respect to the linear rate control scheme for the same number of bits assigned for a particular frame.

关键词： Bit rate Constraint optimization Video coding Telephony Code standards Testing Rate-distortion Signal to noise ratio Quantization Size control

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About multimedia communication standardization architecture

About multimedia communication standardization architecture

引用

International conference on Signal processing Proceedings (ICSP)

作者： Yumin Feng Wei Xu TianXiang Lu Multimedia Communication Research Section of telecommunication & Control Department Northern Jiaotong University China

ISBN: (纸本)0780329120

From the early days of multimedia communication development, ITU-T has paid much attention to establishing standard systems. In this paper, the authors discuss the ITU-T recommendation H series and T series on audiographic and audio-visual multimedia services along with the research work on multimedia communication which their research lab has been doing and their experience of participating in the research and discussion work on ITU-T standard files on image and multimedia communication which was held by the telecommunication department in order to establish China's own corresponding standards.

关键词： Multimedia communication Standardization Multimedia systems Manufacturing industries communications technology Communication standards Road transportation Information technology ISDN TV broadcasting

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Precise weld line detection on a large-scale structure

Precise weld line detection on a large-scale structure

引用

International conference on Industrial Electronics, Control and Instrumentation

作者： A. Ishii H. Yoshida K. Suzuki Y. Ochi Department of Mechanical and Control Engineering University of Electro-Communications Chofu Tokyo Japan

In the automation of arc welding with visual sensors, it is necessary to precisely detect the weld line. However, for large scale structures such as a steel tube transmission tower shown in the present study, it is not easy to maintain reliability of the weld line detection. The proposed method utilizes two important features in the welding of large-scale structure. They are based on the use of CAD/CAM data and the torch control. The proposed method is applied to detect straight and arc weld lines in some practical images. The results are satisfactory and successful in precisely detecting weld lines and weld tacks.

关键词： Welding Large-scale systems image edge detection Automation Steel Pixel Poles and towers image processing Automatic testing Turning

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Versatile visual pattern image coding system

Versatile visual pattern image coding system

引用

1995 conference on visual communications and Imaging processing (1995 VCIP)

作者： CHAN, KW CHAN, KL CITY UNIV HONG KONG DEPT ELECTR ENGNHONG KONGHONG KONG

ISBN: (纸本)0819418587

A full-fledged visual Pattern image Coding system is developed. For high compression ratio, Uniform Patterns are merged by Quadtree merging. For high visual quality, a new set of 2 X 2 Edge Patterns are designed for near perfect reconstruction. By a classification scheme of 11 groups or a threshold of gradient magnitude, the performance profile can adapt to a wide variety of applications.

关键词： image CODING visual PATTERN QUADTREE HIERARCHICAL BLOCK CODING

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Parallel image processing on a PC network

Parallel image processing on a PC network

引用

1995 conference on visual communications and Imaging processing (1995 VCIP)

作者： FUNG, YF HONG KONG POLYTECH UNIV DEPT ELECT ENGNHONG KONGHONG KONG

ISBN: (纸本)0819418587

image processing operations are computational intensive and are usually solved by parallel algorithms implemented either on dedicated parallel computing devices or a network of workstations. With the increasing computing power of Personal Computer (PC) and better networking facilities, it is now feasible to perform distributive computing on a PC network. As the cost/performance ratio of PC is high, this provides a cost effective solution for solving image processing problems. In this paper, we describe how to implement distributive image processing algorithms on a peer-to-peer PC network under the WindowsNT^TM operating system and the efficiency of such algorithms will be discussed.

关键词： DISTRIBUTIVE COMPUTING image processing SOCKETS COMMUNICATION

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Perceptual texture segmentation and characterization

Perceptual texture segmentation and characterization

引用

1995 conference on visual communications and Imaging processing (1995 VCIP)

作者： SANTOS, R OHASHI, T YOSHIDA, T EJIMA, T KYUSHU INST TECHNOL DEPT ARTIFICIAL INTELLIGENCEIIZUKAFUKUOKA 820JAPAN

ISBN: (纸本)0819418587

A very common task in image processing is the segmentation of the image in areas that are uniform in the sense of its features. Various applications can benefit even from partial segmentation, which is performed without need of physical of semantic knowledge. Several segmentation methods exist, but none that is applicable to all tasks. We use color and perceptual texture information to segment color images. Perceptual texture features are the features that can be qualified in simple descriptions by humans. Color information is represented in a perceptual way, using hue, value and saturation. These features' values are represented by histograms that integrates texture information around a small area. Segmentation and classification are obtained by comparing histograms of classes with the histograms of the area around the pixel being classified. We build a small application that uses remote sensing imagery and allows a user to interactively segment a Landsat TM-5 image using color and texture information. The steps and intermediate results of the classification are shown. The results are visually good, and the segmentation using color and texture information is more coherent than the using only color.

关键词： INTERACTIVE image CLASSIFICATION TEXTURED image CLASSIFICATION PERCEPTUAL TEXTURE FEATURES PARTIAL SEGMENTATION REMOTE SENSING image processing DIGITAL image processing

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Comparison of the segmentation of ultrasonic image utilizing different fractal parameters

Comparison of the segmentation of ultrasonic image utilizing...

引用

1995 conference on visual communications and Imaging processing (1995 VCIP)

作者： CHAN, KL CITY UNIV HONG KONG DEPT ELECTR ENGNHONG KONGHONG KONG

ISBN: (纸本)0819418587

Statistical texture analysis has been commonly applied in the quantitative characterization of ultrasonic image. Recently, another approach begins to emerge, which uses fractal dimension. In this investigation, fractal dimension is estimated from histologically confirmed ultrasonic images using three different approaches: intensity- based, spectrum-based and reticular cell counting. The parameters are then used in image segmentation. The fractal model has the advantages that the parameter generated is stable over transformations of scale and linear transforms of intensity. From the results obtained, the performance of fractal dimension obtained by the reticular cell counting method is better than the other two approaches and comparable to the spatial grey level co-occurrence matrices statistic.

关键词： TEXTURE ANALYSIS image SEGMENTATION FRACTAL DIMENSION COOCCURRENCE MATRICES STATISTIC ULTRASONIC image CAROTID PLAQUE

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Video coding control methods based on frame and block classifications

Video coding control methods based on frame and block classi...

引用

1995 conference on visual communications and Imaging processing (1995 VCIP)

作者： MURATA, E MOCHIZUKI, T NEC CORP LTD INFORMAT TECHNOL RES LABSMIYAMAE KUKAWASAKIKANAGAWA 216JAPAN

ISBN: (纸本)0819418587

This paper proposes video coding control methods which greatly improve image quality for videoconference or videophone systems. The proposed methods utilize frame and block classifications to incorporate subjective characteristics. Frame classification makes it possible to tune quantization step sizes according to which is more important regarding each processing frame, motion smoothness or image clarity. Block classification is used to adjust encoding parameters according to whether the block belongs to background regions or not. combining the two proposed method, quantization step sizes are controlled to achieve high image quality according to scene and block contents. Moreover, without unnecessary bit consumption, coding distortion is reduced in uncovered background regions, which appear after moving objects.

关键词： VIDEO CODING H.261 CODING CONTROL VIDEOconference VIDEOPHONE FRAME CLASSIFICATION BLOCK CLASSIFICATION image QUALITY

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Cumulant based blur identification approach to image restoration

Cumulant based blur identification approach to image restora...

引用

1995 conference on visual communications and Imaging processing (1995 VCIP)

作者： XU, Y CREBBIN, G UNIV WESTERN AUSTRALIA DEPT ELECT & ELECTR ENGNNEDLANDSWA 6009AUSTRALIA

ISBN: (纸本)0819418587

In this paper, we provide a novel method based on higher order statistic cumulants to identify nonminimum-phase point spread functions and enlarges the possible distribution type of the image formation field. In our method, we specify the blur identification problem as an ARMA model parameter identification problem, but we consider the image model as a realization of a colored signal instead of a normal zero-mean white Gaussian signal, which enlarges the range of image types. For the colored input ARMA model, the contributions of the bicepstrum of ARMA model are only along the axes and 45 degree(s) degree lines, so we extract the linear parts of cumulant of blur image to analysis, in which we use higher-order statistic techniques to estimate the ARMA parameters. The experiments are present in this paper.

关键词： BLUR IDENTIFICATION image RESTORATION HIGHER-ORDER STATISTIC ARMA MODEL CUMULANT BICEPSTRUM

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Contour tracking and synthesis in image sequences

Contour tracking and synthesis in image sequences

引用

1995 conference on visual communications and Imaging processing (1995 VCIP)

作者： AGUI, T ISHIHARA, T NAGAHASHI, H NAGAE, T TOKYO INST TECHNOL INTERDISCIPLINARY GRAD SCH SCI & ENGNMIDORI KUYOKOHAMA 226KANAGAWAJAPAN

ISBN: (纸本)0819418587

A method for generating a sequence of synthetic images from two different image sequences is described. The method is composed of two major processes, i.e., an object tracking and an image synthesizing. The process of the object tracking consists of two phases. The first phase is to determine an initial contour which roughly approximates the shape of the object, and the second phase is to extract an accurate contour from the initial one by using an active contour model. An initial contour of an object in the first frame is specified manually, and those in the following frames are determined by referring the extracted contour in the previous frame. The contour extracted in the current frame is deformed by detecting nonrigid object movements and the resultant shape is used as the initial contour of the active contour model in the next frame. The motion parameters representing camera motions are also estimated by calculating optical flows between two successive frames.

关键词： CONTOUR TRACKING image SYNTHESIS image SEQUENCE MOTION PARAMETER SUPERIMPOSING

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