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Mobile multimedia communications in a universal telecommunications network

Mobile multimedia communications in a universal telecommunic...

引用

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

作者： ILLGNER, K LAPPE, D RHEIN WESTFAL TH AACHEN INST ELEKTR NACHRICHTENTECHD-52056 AACHENGERMANY

ISBN: (纸本)0819418587

The paper gives an overview on trends in mobile communications which is currently one of the most emerging markets. The demand for new and extended services is a driving force for the development of future mobile networks. Especially the provision of video communications is a great challenge. The current status of MPEG and ITU-T/SG15 concerning mobile communications is described and related to current projects. In the second part some aspects for the design of video codecs for mobile video telephony are outlined. Based on the coming standard H.26P and advanced video codec is described and its suitability for mobile networks is proven by some simulation results.

关键词： MOBILE communications MOBILE MULTIMEDIA VIDEO CODING STANDARDS VIDEO TELEPHONY COMBINED SOURCE CHANNEL CODING UNEQUAL ERROR PROTECTION

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Reversible subband coding of images

Reversible subband coding of images

引用

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

作者： KOMATSU, K SEZAKI, K UNIV TOKYO INST IND SCITOKYO 106JAPAN

ISBN: (纸本)0819418587

In this paper, reversible subband coding of images are proposed. The high-band signals of conventional one-dimensional reversible filter banks were extrapolative prediction error signals or interpolative ones of which number of levels became four times that of the input signals. Therefore, we design reversible filter banks that generate interpolative prediction error signals of which number of levels becomes twice that of the input signals. We also design nonseparable filter banks. It is shown that the proposed methods have the better performance than the conventional reversible subband coding and that the separable method with low-pass filter has little aliasing in the reduced images.

关键词： image CODING REVERSIBLE CODING SUBBAND CODING INTERPOLATIVE PREDICTION

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PERFORMANCE EVALUATION OF UNSUPERVISED STOCHASTIC MODEL-BASED image SEGMENTATION TECHNIQUE

PERFORMANCE EVALUATION OF UNSUPERVISED STOCHASTIC MODEL-BASE...

引用

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

作者： LEI, TH SEWCHAND, W UNIV MARYLAND SCH MED DEPT RADIAT ONCOL BALTIMORE MD 21201 USA

ISBN: (纸本)0819418587

This paper provides a new approach for performance evaluation of unsupervised stochastic model-based image segmentation techniques. Performance evaluation is conducted at three (3) aspects: (1) ability in detection of the number of image regions, (2) accuracy in estimation of the model parameters, and (3) error in classification of pixels into image regions. For detection performance, probabilities of over- detection and under-detection of the number of image regions are defined, and the corresponding formulae in terms of model parameters and image quality are derived. For estimation performance, this paper shows that both Classification-Maximization (CM) and Expectation-Maximization (EM) algorithms produce the asymptotically unbiased ML estimates of model parameters in the case of no-overlap. Cramer-Rao bounds of variances of these estimates are derived. For classification performance, misclassification probability, based on parameter estimate and classified data, is derived to evaluate segmentation errors. The results by applying this performance evaluation method to the simulated images demonstrate that for the images with the moderate quality, the detection procedure is robust, the parameter estimates are accurate, and the segmentation errors are small.

关键词： FINITE NORMAL MIXTURE OVER UNDER DETECTION ML ESTIMATION CRAMER-RAO BOUND BAYESIAN CLASSIFIER MISCLASSIFICATION

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Obtaining an upper bound in MPEG coding performance from jointly optimizing coding mode decisions and rate control

Obtaining an upper bound in MPEG coding performance from joi...

引用

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

作者： KWOK, W SUN, HF JU, J DAVID SARNOFF RES CTR PRINCETONNJ 08543

ISBN: (纸本)0819418587

This paper presents a general procedure for determining the optimal MPEG coding strategy in terms of the selection of macroblock coding modes and quantizer scales. The two processes of coding mode decision and rate control are intimately related to each other and should be determined jointly in order to achieve optimal coding performance. We formulate the constrained optimization problem and present solutions based upon rate- distortion characteristics, or R(D) curves, for all the macroblocks that compose the picture being coded. Distortion of the entire picture is assumed to be decomposable and expressible as a function of individual macroblock distortions, with this being the objective function to minimize. The determination of the optimal solution is complicated by the MPEG differential encoding of motion vectors and dc coefficients, which introduces dependencies that carry over from macroblock to macroblock for a duration equal to the slice length. Once the upper bound in performance is calculated, it can be used to assess how well practical sub-optimum methods perform.

关键词： Distortion Computer programming image quality Motion models image quality standards Performance modeling Algorithm development Autoregressive models image processing Quantization

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Fixed-length compression method using the Karhunen-Loeve transform

Fixed-length compression method using the Karhunen-Loeve tra...

引用

Proceedings of the 1995 IEEE Pacific RIM conference on communications, Computers, and Signal processing

作者： Nasiopoulos, Panos Yedlin, Matthew Ward, Rabab K. Univ of British Columbia Vancouver Canada

A compression method is presented which combines the distinct advantage of being fixed length with the visual picture quality of transform-based coding methods. This method compresses the Karhunen-Loeve transform coefficients of 8×8 pixel blocks of the picture and attains a compression ratio of 15.37:1 for color images. Compared to the absolute moment block truncation coding, the other known fixed length compression method, our method improves the compression ratio by 68% and significantly improves the visual quality of the reconstructed picture.

关键词： image compression

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Non-uniform image sampling and interpolation over deformed meshes and its hierarchical extension

Non-uniform image sampling and interpolation over deformed m...

引用

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

作者： LEE, O WANG, Y POSDATA LTD CTR RES & DEVSEOULSOUTH KOREA

ISBN: (纸本)0819418587

To improve the reconstructed image quality with a given number of sampling points, nonuniform sampling is desired which adapts the sampling density according to the local bandwidth of the signal. Determination of optimal sampling positions and interpolation from nonuniform samples through the use of a coordinate mapping which converts nonuniform samples into points on a regular sampling lattice. We then introduce a nonuniform sampling scheme which embeds the samples in a generally deformed mesh structure that can be easily mapped to a regular sampling lattice. The optimal samples or the mesh is generated by minimizing the interpolation error. The numerical difficulty associated with dealing with nonuniform samples are circumvented by mapping all the operations to the master domain where the samples are uniformly distributed. With this scheme, in order to maintain the mesh topology, unnecessary nodes are usually allocated in large but smooth regions. For an improved sampling efficiency, a hierarchial nonuniform sampling scheme is also developed. Which embeds the samples in a generalized quadtree structure. Compared to its nonhierarchical counterpart, this scheme can reduce the numbers of samples significantly, under the same visual quality constraint.

关键词： NONUNIFORM SAMPLING ADAPTIVE MESH GENERATION

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Three-dimensional tree shape reconstruction from multi-viewpoint images based on fractal geometry

Three-dimensional tree shape reconstruction from multi-viewp...

引用

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

作者： KUWAHARA, N SHIWA, S KISHINO, F ATR COMMUN SYST RES LABS DEPT ARTIFICIAL INTELLIGENCEKYOTOJAPAN

ISBN: (纸本)0819418587

A great deal of research has been devoted to generating 3D tree shapes by simulating tree growth to obtain realistic yet imaginary tree shapes. In order to display an actual scene in 3D computer graphics, 3D tree shapes of actual trees are necessary. Currently, despite considerable research on 3D shape reconstruction of objects from their silhouettes, the existing methods have so far been unable to handel complicated shape objects like trees whose silhouettes have a lot of occlusions. In this paper, we propose an algorithm for reconstructing 3D tree shapes based on fractal geometry, and show some experimental results.

关键词： 3-DIMENSIONAL SHAPE RECONSTRUCTION image processing FRACTAL COMPUTER GRAPHICS VIRTUAL REALITY

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MOBILE VIDEO communications TECHNIQUES AND SERVICES

MOBILE VIDEO COMMUNICATIONS TECHNIQUES AND SERVICES

引用

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

作者： IBARAKI, H FUJIMOTO, T NAKANO, S NIPPON TELEGRAPH & TEL PUBL CORP YOKOSUKA ELECT COMMUN LABS HUMAN INTERFACE LABS YOKOSUKA KANAGAWA 23803 JAPAN

ISBN: (纸本)0819418587

This paper describes picture information transmission for portable multimedia terminals. The radio links used in portable multimedia terminals have narrower channel capacity and higher transmission error rates than wired links such as those used in ISDN. To transmit multimedia information of satisfactory quality over radio links, robustness against radio link errors must be improved, because picture deterioration is much more apparent than audio deterioration. First, the effects of transmission errors on picture quality are analyzed using the H.261 coding system used for ISDN picture communication. Second, the relationship among bit error rate, terminal velocity, and picture quality is analyzed and the deterioration mechanisms of picture quality are discussed. Three techniques for improving picture quality against radio link errors are proposed.

关键词： MOBILE COMMUNICATION VIDEO CODING ERROR CORRECTING CODE MULTIMEDIA COMMUNICATION

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Range image segmentation via edges and critical points

Range image segmentation via edges and critical points

引用

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

作者： ZHANG, XT ZHAO, DM UNIV MICHIGAN DEPT ELECT & COMP ENGNDEARBORNMI 48128

ISBN: (纸本)0819418587

A novel method for range image segmentation is presented in this paper, It is based on an integration of edge and region information. The algorithm consists of three steps: edge and critical point detection, triangulation, and region information. The edge detection method presented in this paper is based on morphological operations. In general, segmentation may not be effective when only edge operators are applied on range images especially on noisy images. Further processing is important for final segmentations when the edge operators are not sufficient. In this paper, critical points are extracted from planar edge curves. These edge curves and critical points constitute an initial set of segments. The constrained Delaunay triangulation is employed on the initial set to obtain triangle-like connection graphs. By projecting the critical points and their connectivity relationships in parallel onto 3D surface, a 3D surface structure graph (SSG) is obtained. Hence, segmentation is completed by grouping these triangle-like facets. The grouping scheme is presented in this paper according to the normals of adjacent facets. Because edge curves are not usually straight lines but rather a set of curve segments, we introduce extensive triangulation for building 3D triangle-like surface structure graphs (SSG's). This method significantly reduces the computation complexity compared to polyhedral approximations using the original Delaunay triangulation. Experimental results show that the method is efficient for range image segmentation especially for polyhedra.

关键词： MORPHOLOGY SEGMENTATION EDGE DETECTION CRITICAL POINTS AND DELAUNAY TRIANGULATION

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Vector quantization by hierarchical packing of embedded truncated lattices

Vector quantization by hierarchical packing of embedded trun...

引用

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

作者： RICORDEL, V LABIT, C INST NATL RECH INFORMAT & AUTOMAT IRISAF-35042 RENNESFRANCE

ISBN: (纸本)0819418587

The purpose of this paper is to introduce a new vector quantizer (VQ) which takes place in a temporal-adaptative coding scheme for the compression of digital image sequences. Our approach, which has to perform a fast codebook construction, unify both efficient coding methods: a fast lattice encoding and an unbalanced tree-structured codebook design according to a distortion vs. rate tradeoff. Moreover, this tree-structured lattice vector quantizer (TSLVQ) has a convenient property: because of its lattice structure, no reproduction vectors have to be transmitted. Briefly this TSLVQ technique is based on the hierarchical packing of embedded truncated lattices. We investigate here its design: by, first, explaining how to determine the support lattice and secondly how to obtain the hierarchical set of truncated lattice structures which can be optimally embedded with respect to the hierarchical packing. We then use a simple quantization procedure and describe the corresponding tree-structured codebook. Finally we present two unbalanced tree-structured codebook design algorithms based on the BFOS distortion vs. rate criterion.

关键词： VECTOR QUANTIZATION image SEQUENCE COMPRESSION CODING LATTICE STRUCTURES PRUNED TREES

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