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Exploitation and extension of the region-of-interest coding functionalities in JPEG2000

IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2003年第4期49卷 818-823页

作者： Signoroni, A Lazzaroni, F Leonardi, R Univ Brescia Signals & Commun Lab DEA I-25123 Brescia Italy

The purpose of this paper is to present a technique to extend the functionality and the application fields of a spatially selective coding within a JPEG2000 framework. The image quality drop between the Regions of Interest (roi) and the background (BG) is considered. From the conventional point of view, the reconstructed image quality steeply drops along the roi boundary;however this effect can be considered or perceived to be objectionable in some situations. We here propose a simple quality decay management, which makes use of concentric roi with different scaling factors. This allows the technique to be perfectly consistent with the JPEG2000 part 2 roi definition and description. The proposed techniques may have a significant impact on applications where both coding rate minimization and coded image quality are important and/or become critical factors. Experiments and examples demonstrate the benefits of the presented approach(1).

关键词： image quality JPEG2000 selective roi coding wavelet transform

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selective coding with controlled quality decay for 2D and 3D images in a JPEG2000 framework

Selective coding with controlled quality decay for 2D and 3D...

引用

Conference on Visual Communications and Image Processing 2003

作者： Signoroni, A Lazzaroni, F Leonardi, R Univ Brescia DEA Signals & Commun Lab I-25123 Brescia Italy

ISBN: (纸本)0819450235

This paper presents some ideas which extend the functionality and the application fields of a spatially selective coding within a JPEG2000 framework. At first, the image quality drop between the Regions of Interest (roi) and the background (BG) is considered. In a conventional approach, the reconstructed image quality steeply drops along the roi boundary;however, this effect could be considered or perceived objectionable in some use cases. A simple quality decay management is proposed here, which makes use of concentric roi with different scaling factors. This allows the technique to be perfectly consistent with the JPEG2000 part 2 roi definition and description. Another considered issue is the extension of the selective roi coding to a 3D Volume of Interest coding. This extension is currently under consideration for the part 10 of JPEG2000, JP3D. An easy and effective 2D to 3D extension for the VOI definition and description is proposed here: a VOI is defined by a set composition of roi generated solids, where roi are defined along one or more volume cutting direction, and is described by the relative set of roi parameters. Moreover, the quality decay management can be applied to this extension. The proposed techniques could have a significant impact on the selective coding of medical images and volumes. Image quality issues are very important but very critical factors in that field, which also constitutes the dominant market for 3D applications. Therefore;some experiments are presented on medical images and volumes in order evaluate the benefits of the proposed approaches in terms of diagnostic quality improvement with respect to a conventional roi coding usage.

关键词： selective roi coding image quality wavelet coding 3D datasets JPEG2000 medical imaging

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