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检索条件"任意字段=Conference on Digital Video Compression - Algorithms and Technologies 1995"

共 189 条记录，以下是71-80 订阅

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Hybrid block matching algorithm for motion estimation

Hybrid block matching algorithm for motion estimation

引用

conference on digital compression technologies and Systems for video Communications

作者： Pao, TL Wu, JS TATUNG INST TECHNOL DEPT COMP SCI & ENGNTAIPEI 104TAIWAN

ISBN: (纸本)0819423564

Motion compensation is a key operation in video compression to remove the temporal redundancy in a video sequence. One of the application examples is the MPEG video compression standard. The most commonly used motion estimation algorithm is the block matching algorithm due to its regularity. Full search is the most straight forward block matching algorithm which can always locate the optimal motion vector. However, its computational complexity makes it impractical in real time applications. Fast algorithm required less computation but the obtained motion vector is suboptimal. In this paper, a hybrid block matching algorithm is proposed. In this algorithm, average intensities of groups of pixels are used to roughly estimate the motion first. Then, the fast search algorithm is applied in a reduced search region centered around the result of the first pass. Experimental results show that the performance of the estimation accuracy is quite close to that of the full search algorithm while the computational complexity is only slightly increased with respect to those fast algorithms.

关键词： motion estimation motion compensation block matching algorithm video sequence coding

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Parameter estimation in regularized reconstruction of BDCT compressed images for reducing blocking artifacts

Parameter estimation in regularized reconstruction of BDCT c...

引用

conference on digital compression technologies and Systems for video Communications

作者： Mateos, J Katsaggelos, AK Molina, R UNIV GRANADA DEPT CIENCIAS COMPUTAC & IAGRANADA 18071SPAIN

ISBN: (纸本)0819423564

High compression ratios for both still images and sequences of images are usually achieved by discarding information represented by block discrete cosine transform (BDCT) coefficients which is considered unimportant. This compression procedure yields images that exhibit annoying block artifacts. In this paper we examine the reconstruction of BDCT compressed images which results in the removal of the blocking artifact. The method we propose for the reconstruction of such images, is based on a hierarchical Bayesian approach. With such an approach image and degradation models are required. In addition, unknown hyperparameters, usually the noise and image variances, have to be estimated in advanced or simultaneously with the reconstructed image. We show how to introduce knowledge about these parameters into the reconstruction procedure. The proposed algorithm is tested experimentally.

关键词： Image compression Reconstruction algorithms Image quality Distance measurement Quantization Virtual colonoscopy Visualization Matrices Radon Wavelets

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Object based very low bit rate coding with robust global motion estimation and background/foregound separation

Object based very low bit rate coding with robust global mot...

引用

conference on digital compression technologies and Systems for video Communications

作者： Saflekos, A Strintzis, MG BenoisPineau, J Barba, D UNIV THESSALONIKI DEPT ELECT & ELECT ENGNINFORMAT PROC LABTHESSALONIKI 54006GREECE

ISBN: (纸本)0819423564

We present a two-step segmentation scheme for the very low bit rate coding of general purpose video scenes. Our objective is to determine the regions of interest before the actual segmentation procedure, so as to reduce the computational overhead introduced by this relatively complex process, and to avoid the phenomenon of over-segmentation of the scene. Simulation results show that the proposed scheme results in a radical reduction of the number of discrete spatio-temporal regions, while the background is identified as one uniform region, even when it is characterized by complex global motion.

关键词： Image segmentation Motion estimation video video coding Motion models Cameras Image processing algorithms and systems Computer simulations Image quality Visualization

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Multiview video coding using a multi-state dynamic programming disparity estimation algorithm

Multiview video coding using a multi-state dynamic programmi...

引用

conference on digital compression technologies and Systems for video Communications

作者： Grammalidis, N Strintzis, MG UNIV THESSALONIKI DEPT ELECT & COMP ENGNTHESSALONIKI 54006GREECE

ISBN: (纸本)0819423564

An efficient disparity estimation and occlusion detection and characterization algorithm for multiocular systems is presented. A dynamic programming algorithm, using a multiview matching cost as well as pure gometrical constraints, is used to provide an estimate of the disparity field and to identify occluded areas. An important advantage of this approach is that not only are the occluded points simultaneously detected, but they are also characterized by the number of views where each point is occluded. Specifically, a 'state' map describing the number of matches for each imaged pixel and thus identifying occluded points in the multiview sequence is produced. The disparity and state information is then coded using a directional coding technique and applied to obtain virtual images from intermediate viewpoints. Experimental results, obtained using a four-view image sequence, illustrate the performance of the proposed technique.

关键词： Computer programming Detection and tracking algorithms video coding Imaging systems Panoramic photography Cameras Computer engineering Computing systems Image display Stereoscopy

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Image quality prediction for bitrate allocation

Image quality prediction for bitrate allocation

引用

conference on digital compression technologies and Systems for video Communications

作者： Fleury, P Ebrahimi, T ETH ZURICH SIGNAL PROC LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819423564

Recent developments in image coding tend to promote schemes consisting of a great variety of coding algorithms applied to different parts of the image to code. This results in an improved rate-distortion behavior of the global system. The selection of the optimal coding method for a given region of an image is still a computationally intensive task, as most of the current schemes need to compute the result for all algorithms and to choose the most suited one. This paper investigates a method to predict the coding performance. This prediction is based on extracted features of the input image. The computation of those features, as well as the prediction itself, is computationally much less expensive than the exhaustive selection. The prediction system is based on neural networks. Selected image features and a set of representation of those features build the input of the network. The low computation cost also enables a dynamic distribution of the fixed bitrate over the different parts of the image, and therefore an algorithm capable to allocate bits to reach a constant quality over the whole image.

关键词： Image compression Image quality Binary data Neural networks Quantization Algorithm development Data modeling Computing systems Feature extraction Image processing

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Model-based hierarchical motion compensation technique

Model-based hierarchical motion compensation technique

引用

conference on digital compression technologies and Systems for video Communications

作者： Lee, JS Lee, SU SEOUL NATL UNIV SCH ELECT ENGNSIGNAL PROC LABKWANAK GUSEOUL 151742SOUTH KOREA

ISBN: (纸本)0819423564

In this paper, a new motion compensation technique is proposed to enhance the performance of the conventional motion compensation technique using the block matching algorithm, whose main features are a translational motion model and a uniformly spaced motion field. The proposed MC technique consists of two main stages: split and merge. In split stage, deformable squared-block-based motion estimation technique is employed to describe a complex motion. In merge stage, the rate-distortion optimal quadtree decomposition technique is employed to adapt the nonuniform characteristics of motion in sequence. From the simulation result, it is shown that the proposed technique yields about 1 - 2 dB PSNR gain over BMA at the same bit rate.

关键词： Motion estimation Motion models Model-based design Ferroelectric materials Distortion Image compression Image resolution Genetic algorithms Signal processing Zoom lenses

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Structure-based fractal image coding

Structure-based fractal image coding

引用

conference on digital compression technologies and Systems for video Communications

作者： Titkov, B Tikhotskij, A Myboroda, A Buley, H TELEVIS RES INST NIITST PETERSBURGRUSSIA

ISBN: (纸本)0819423564

An image coding scheme using partitioned iterated function systems (fractal codec) is presented. It extends the usual block-based algorithms with quadtree partitioning by splitting with arbitrarily shaped masks. Besides the general advantages of fractal coding such as very high compression and scalable decoding this gives provision for shape- adaptive coding. Furthermore the usage of orthogonal luminance transformations results in code suitable for browsing. The codec now uses up to 256 masks at each level of the quadtree partition (up to four levels) which may be applied twice. The mask set was experimentally optimized on a set of images. The high degree of flexibility is handled besides the usage of the known 'multidimensional nearest neighbor search' by an estimation of useful masks based on a block-structure analysis. Fractal referencing to parts of the image already coded allows for additional reduction of data rate. Controlling takes into account the compression efficiency of the different types of approximation. The bit stream of the encoded image is structured, pre-encoded and selectivity entropy coded by arithmetic coding. Remaining blocking artifacts are concealed by a generally applicable method called bending, which is designed to avoid blurring by filtering.

关键词： image compression fractal coding block-boundary-artefact concealment

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Vertex tracking for grid-based motion compensation

Vertex tracking for grid-based motion compensation

引用

conference on digital compression technologies and Systems for video Communications

作者： Schroder, K UNIV DORTMUND LEHRSTUHL NACHRICHTENTECHD-44221 DORTMUNDGERMANY

ISBN: (纸本)0819423564

To overcome some of the well-known artefacts stemming from block-based motion compensation, grid-based techniques have been proposed in the past as a promising alternative to block matching. While the latter is restricted to simple translational motion, grid-based compensation employs e.g. an affine model when triangular meshes are assumed. The theoretically superior model, however, will perform worse at object boundaries where the connectivity constraint of the meshes causes smoothing of the underlying discontinuous motion vector field. This effect can be diminished by providing an individual grid for each object in a scene. The crucial part of grid-based motion prediction is the technique of tracking mesh vertices. In contrast to block matching, motion estimation of vertices cannot be done independently without sacrificing prediction gain. This paper discuses different algorithms for vertex tracking. The issue of tracking at object boundaries and the influence of the resampling algorithm on the prediction gain are addressed in detail. Object grids, carrying both shape and motion information, are evaluated further in terms of shape coding efficiency and temporal scalability. Both aspects become important when aiming at functional coding for low bit rates, as it is currently being investigated in the framework of MPEG-4.

关键词： Stars Detection and tracking algorithms Convolution Motion estimation Distortion Motion models video Computer programming Volume rendering Fourier transforms

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Frame rate conversion based on acceleration and motion-based segmentation

Frame rate conversion based on acceleration and motion-based...

引用

conference on digital compression technologies and Systems for video Communications

作者： Csillag, P Boroczky, L KFKI RES INST MEASUREMENT & COMP TECHNIQUESH-1525 BUDAPESTHUNGARY

ISBN: (纸本)0819423564

Frame rate conversion requires interpolation of image frames at time instances, where the original sequence has not been sampled. This can be done in high quality only by means of motion-compensated algorithms, therefore the knowledge of motion present in the sequence is essential. This motion information has to be determined from the image sequence itself. In this paper a motion-based image segmentation algorithm is proposed, and its application for motion- compensated (MC) frame rate conversion is presented. The segmentation algorithm that can trace multiple rigid objects with translational movement, is based on vector quantization of the estimated motion field determining a set of global motion vectors and segmenting the images into multiple moving areas. Then, the spatial order of the objects (which one is in front of the other) is determined. Interpolation is performed based on the results of the segmentation, the set of motion vectors, and the proper handling of covered and uncovered areas. Furthermore, an accelerated motion model developed previously by the authors is applied, in order to further improve the performance of the MC frame rate converter.

关键词： frame rate conversion pel-recursive motion estimation motion-compensation frame interpolation accelerated motion motion-based segmentation video conversion low bitrate video coding motion trajectory optical flow

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Method for matching compressed video to ATM networks

Method for matching compressed video to ATM networks

引用

Proceedings of the 1995 IEEE International conference on Image Processing. Part 3 (of 3)

作者： Safranek, Robert J. Kalmanek, Charles R. Garg, Rahul AT&T Bell Lab Murray Hill United States

Over the last few years three technologies have reached the stage of maturation where then can become synergistic. These are wideband, high speed networking high quality video compression (MPEG-I and II), and high capacity affordable digital storage media. This paper addresses the interaction of these three technologies. In particular, it examines the problem of taking a compressed video data stream that is stored on a server, and transmitting it over an ATM channel which has a capacity smaller than that required by the data stream. The conventional approach to this problem would be to transcode by decoding the video data, and then re-encoding so as to meet the channel constraints. Currently this is not a cost effective solution since, while MPEG decoders are relatively inexpensive, encoders are not. Our approach to this problem is to partially decompress the video bitstream. Then, perform the transcoding in the quantized data domain. Finally, a valid bitstream is reassembled and transmitted. This approach has the advantage providing nearly identical quality as the traditional transcoding approach, at a fraction of the hardware cost.

关键词： Image compression

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