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1997 Conference on Visual Communications and Image Processing

作者： Sanson, H Labelle, L CCETT (France)

ISBN: (纸本)0819424358

This paper presents a solution for image partition encoding, usable for region-based image or video compression. This solution consists of several elements which can eventually be used separately in other contexts such as the recent VOP contour encoding defined withing the ISO-MPEG-4 standardization effort. Namely, these elements are the graph representation of the contour network topology on the one hand, and the B-spline approximation of the contour geometry, approximation carried out on a purely geometric criterion on the other hand. The role of the graph repesentation is two-fold;to enable the regeneration of region labels at the decoder side, without needing to send them along with the contour geometry, which could be jeopardized otherwise by contour approximation errors, and to save the coding of the contours starting points. Such label regeneration is based on the extraction of the list of consecutive arcs corresponding to the external region boundary only from the graph structure. The algorithm for such an extraction is given as well as the encoding of the graph structure. Compression of the geometric information is obtained through contour approximation by B-spline curves. Such an approximation combines a Least Mean Squares curve fitting and a gradient-based geometric curve evolution from this first approximation. Finally, a solution is proposed for the encoding of the resulting B-spline control points.

关键词： region-based image coding partition coding graph geometric curve approximation B-splines

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partitions: A taxonomy of types and representations and an overview of coding techniques

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SIGNAL PROCESSING-IMAGE COMMUNICATION 1997年第1-3期10卷 5-19页

作者： deSequeira, MM Cortez, D Torre Norte 10–15 Instituto de Telecomunicações IST 1096 Lisboa Cedex Portugal

Recognising the importance of partition or shape coding in the field of image and video coding, and the fact that a systematisation of the subject would simplify the comparison of partition coding techniques, this paper proposes a classification of partition types and partition representations into a taxonomy tree. The partition type level of the tree classifies the possible partition types that may have to be coded. The partition representation level classifies the possible representations for each partition type. This paper also overviews the partition coding techniques which address the considered partition types and which use the identified partition representations. Emphasis is given to binary partition coding techniques proposed within the framework of NIPEG-4. (C) 1997 Elsevier Science B.V.

关键词： segmentation partition coding image coding chain coding

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A JBIG-based approach to the encoding of contour maps

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IEEE TRANSACTIONS ON IMAGE PROCESSING 2000年第5期9卷 936-941页

作者： Pinho, AJ Univ Aveiro Dept Elect & Telecommun P-3810193 Aveiro Portugal Univ Aveiro Inst Engenharia Electr & Telemat Aveiro P-3810193 Aveiro Portugal

Recently, a new technique for the lossless encoding of contour maps was introduced, based on the concept of "transition points." in this paper we show that by using a simple representation for the transition points, i.e., the map of transition points, the problem of encoding arbitrary contour maps can be easily converted into a problem of lossless image coding. Experimental results show that the joint bilevel image experts group (JBIG) image coding standard can be used successfully For encoding maps of transition points, outperforming, in most cases, differential chain-coding. Moreover, if we take into account that JBIG codecs are available as "off the shelf" components, then the effort required to implement the proposed method is small.

关键词： chain coding contour coding partition coding region-based image coding shape coding transition points

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Adaptive context-based arithmetic coding of arbitrary contour maps

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IEEE SIGNAL PROCESSING LETTERS 2001年第1期8卷 4-6页

作者： Pinho, AJ Univ Aveiro Dept Elect & Telecomunicacoes P-3800 Aveiro Portugal Univ Aveiro Inst Engn Elect & Telemat Aveiro P-3800 Aveiro Portugal

An efficient technique for encoding arbitrary contours is presented. It is based on the concept of transition point of a contour map and relies on a new four-symbol adaptive context-based arithmetic encoder (CAE) that calculates contexts in the (binary) domain of the contour map. The results obtained with this new technique applied to the compression of image partitions are substantially better than those previously attained, showing a clear superiority over adaptive CAE-based differential chain coding and also over the MPEG-4 shape coder.

关键词： chain coding contour coding partition coding region-based image coding shape coding transition points

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