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Vector quantization and coding of the chromatic information in an image

Vector quantization and coding of the chromatic information ...

引用

visual communications and image processing 1998 conference

作者： Dubois, E Fadli, J Lauzon, D INRS Telecommun Verdun PQ H3E 1H6 Canada

ISBN: (纸本)0819427497

This paper presents a new method for coding the chromatic component of a color image that exploits the piecewise-constant nature of chromatic information. The image is first transformed to a color space in which chromatic information is nearly piecewise constant. The chromatic component is then represented by entries from a codebook of two-dimensional chromatic vectors adapted to the given image (two-dimensional vector quantization). Both memoryless quantization and quantization with spatial memory are considered. Finally, the field of labels is coded using a suitable lossless code with memory. we have used a context-dependent arithmetic code. Experimental results showing rate-distortion performance of-the method under various conditions are presented.

关键词： color image coding vector quantization

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3-D visual data compression based on ray-space projection

3-D visual data compression based on ray-space projection

引用

1997 conference on visual communications and image processing

作者： Naemura, T Kaneko, M Harashima, H Univ. of Tokyo (Japan)

ISBN: (纸本)0819424358

As 2-D image communication systems come into use widely, 3-D imaging technology enhancing the reality of visual communication is getting to be considered as a promising next-generation medium that can revolutionize information systems. To date, 3-D image communication has not been discussed at a comprehensive level because several kinds of promising 3-D display technologies are still making rapid progress. Considering such a situation, this paper introduces the concept of the ''Integrated 3-D visual Communication System''. The key feature in this new concept is a display-independent neutral representation of visual data. The flexibility of this concept will promote the progress of 3-D image communication systems before the 3-D display technology reaches maturity. In this paper, for this purpose, ray-based approach is examined. In the present representation method, the whole ray data is equally treated as a set of orthogonal views of the scene objects. The advantage of this approach is to allow the synthesis of any perspective view by gathering appropriate ray data from the set of orthogonal views independently of any geometric representation. A real-time progressive transmission method has been also examined. The experimental results show how the present representation method could be applied to the next-generation 3-D image communication system.

关键词： 3-D image coding 3-D image processing virtual reality display-independent representation of visual data ray-space ray-based representation direction-uniform projection orthogonal views progressive coding image-based rendering

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Region-based motion estimation with uncovered region detection

Region-based motion estimation with uncovered region detecti...

引用

visual communications and image processing 1998 conference

作者： Wang, D Commun Res Ctr Ottawa ON K2H 8S2 Canada

ISBN: (纸本)0819427497

In natural video sequences, object movement causes regions to be covered or uncovered. Conventional algorithms for region-based motion estimation do not take these regions into full account. Uncovered regions seriously decrease the accuracy of motion estimation. This paper presents an algorithm for increasing the motion estimation accuracy. This algorithm detects uncovered regions and uses them to improve image segmentation. Experimental results show that the presented algorithm is effective in reducing the displaced frame difference, without introducing any extra information for coding applications.

关键词： motion estimation video coding object-based video coding image segmentation

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Model supported exploitation of aerial images

Model supported exploitation of aerial images

引用

1997 conference on visual communications and image processing

作者： Chellappa, R UNIV MARYLAND CTR AUTOMAT RESCOLLEGE PKMD 20742

ISBN: (纸本)0819424358

Model-supported exploitation is a new paradigam in image Understanding research. In this paradigm, three main technical areas have been identified: semi-automatic or automatic construction of site models, automated positioning of images to the sites, and monitoring of movable objects and construction activities. In this paper, we summarize recent progress in the detection and counting of vehicles in selected locales, monitoring and characterization of vehicle groupings. We present the algorithms used and the results obtained, The detection and counting method employs geometrical models and uses a spatial contour matching approach. The configuration detection method exploits knowledge of geometrical models in the frequency domain. The issues of parameter learning as well as sensitivity of the detection performance to misspecification of model and tuning parameters are briefly examined.

关键词： 3D modeling Data modeling Roads Sensors Detection and tracking algorithms Fourier transforms Cameras image processing Performance modeling image understanding

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Hybrid wavelet-fractal image compression based on a rate-distortion criterion

Hybrid wavelet-fractal image compression based on a rate-dis...

引用

1997 conference on visual communications and image processing

作者： Li, J Kuo, CCJ Sharp Labs. of America (United States) Univ. of Southern California (United States)

ISBN: (纸本)0819424358

A new hybrid wavelet-fractal coder (WFC) for image compression is proposed in this research. We show that the application of contractive mapping for interscale wavelet prediction in the wavelet domain offers bit rate savings in some regions. The prediction residue is then quantized and encoded by traditional wavelet coders. WFC allows the flexibility to choose either direct coding of wavelet coefficients or fractal prediction followed by residual coding to achieve a better rate-distortion (R-D) performance. A criterion of low complexity is derived to evaluate the R-D efficiency of fractal prediction. The superior performance of WFC is demonstrated with extensive experimental results.

关键词： wavelet-fractal coder image coding fractal compression wavelet compression

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Comparison of linear and non-linear video processing and evaluation for an MPEG2 codec

Comparison of linear and non-linear video processing and eva...

引用

1997 conference on visual communications and image processing

作者： Lucat, L Siohan, P CCETT (France)

ISBN: (纸本)0819424358

Considering a video signal which has been degraded by a PAL codec and a noisy transmission on a satellite channel, two digital filtering schemes are presented for reducing the different resulting signal distortions (cross-effect on the PAL-decoded signal components, impulses of the high-frequency demodulator, transmission noise) before its MPEG2 encoding. The first one deals with crossing-effect and transmission noise using a single non-linear filtering box, while the second scheme consists of several linear processing, each one devoted to one kind of distortion. Both filtering approaches are discussed, and their performances before and after the MPEG2 codec are compared, using objective, peak signal-to-noise ratio, as well as subjective, visual quality, criteria.

关键词： video processing MPEG2 pre-processing cross-color vector-median filter matched filtering

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ATM source-channel image coding

ATM source-channel image coding

引用

1997 conference on visual communications and image processing

作者： Philippe, O Guedon, JP Terrien, F IRESTE (France)

ISBN: (纸本)0819424358

The Asynchronous Transfer Mode (ATM) appears as the standard protocol for image and video transmision. There is virtually no bandwidth limitations neither a restricted size of operating area. However, the main problem stands in the non secured transmission when ATM native applications are implemented. This induced a new way of encoding images where the redundancy (classically managed by the network protocol) is generated into the CoDec. In this paper, we present the Mojette transform that generates the redundancy at the higher level of the coder in order to safely transmit image data. Block and wavelet implementations associated with the Mojette transform are presented and compared not only from the coder point of view but for the source and the channel characteristics. For this specific case we also present the asynchronous Mojette reconstruction. An adapted object oriented model has been developped accordingly.

关键词： ATM Mojette transform image coding source-channel coding wavelet decomposition redundancy

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Generation of arbitrarily focused images by using multiple differently focused images

Generation of arbitrarily focused images by using multiple d...

引用

1997 conference on visual communications and image processing

作者： Kodama, K Aizawa, K Hatori, M Univ. of Tokyo (Japan)

ISBN: (纸本)0819424358

In this paper, we propose a novel method of arbitrarily focused image acquisition using multiple differently focused images. First, we describe our previous select-and-merge method for all-focused image acquisition. We can get good results by using this method but it's not easy to extend this method for generating arbitrarily focused images. Then, based on the assumption that depth of the scene changes stepwise, we derive a formula for reconstruction between the desired arbitrarily focused image and multiple acquired images;we can reconstruct the arbitrarily focused image by iterative use of the formula. We also introduce coarse-to-fine estimation of PSFs of the acquired images. We show we can reconstruct arbitrarily focused images for a natural scene. In other words, we can simulate virtual cameras and synthesize images focused on arbitrarily depths.

关键词： PSF image reconstruction defocus estimate arbitrarily focused image image fusion

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Motion tracking of color image sequences using neural networks

Motion tracking of color image sequences using neural networ...

引用

1997 conference on visual communications and image processing

作者： Iwata, H Nagahashi, H Tokyo Institute of Technology (Japan)

ISBN: (纸本)0819424358

Region segmentation of images is a well-known 'ill-posed problem', and a specific algorithm like regularization seems to be available. In this paper, an active region segmentation algorithm based on a regularization approach using the Hopfield neural network is proposed. The objective function to be minimized by the network is defined based on the criteria that integrate region growing and edge detection for the image segmentation. The energy of the network tends to converge on a local minimum, so that pyramid images are used to avoid such local minima and to achieve fast convergence. Moreover, the active region segmentation algorithm is applied to a sequence of color images to track an object region that change in appearance through complex and nonstationary background/foreground situations. Experimental results show that it's possible to segment images and track the object region using the minimization principle of the energy function of the Hopfield neural network.

关键词： motion tracking color image sequences active region segmentation Hopfield neural network

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image compression using conditioning contexts

Image compression using conditioning contexts

引用

1997 conference on visual communications and image processing

作者： Muller, F Menser, B Aachen Univ. of Technology (Germany)

ISBN: (纸本)0819424358

A method for still image coding is proposed which allows for progressive transmission, because low detailed versions of the image can be reconstructed from a truncated bit stream. The proposed method is in its main aspects close to the classical pyramid approach of Burt and Adelson.(1) While retaining the main idea, of using a Laplacian pyramid type decomposition, the new proposal differs in the filters employed for pyramid decomposition and in the bit allocation and quantization. The image is decomposed into a centered spline Laplacian pyramid. The pyramid is quantized and coded following a layered quantization approach together with a layered coding method based on conditional arithmetic coding.(2) The encoder outputs an embedded bit stream. Thus the decoder may truncate the bitstream at any point, which results in a more or less detailed image. Besides this rate-distortion scalability the coder has a multiresolution property, due to the pyramid decomposition. An extension to hybrid video coding is also discussed.

关键词： conditioning contexts multiresolution centered spline pyramid scalable image coding lossy video compression

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