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Quality Evaluation and Nonuniform Compression of Geometrically Distorted Images Using the Quadtree Distortion Map

Author(s): Costa Cristina | De Natale Francesco GB | Granelli Fabrizio

Journal: EURASIP Journal on Advances in Signal Processing
ISSN 1687-6172

Volume: 2004;
Issue: 12;
Start page: 470826;
Date: 2004;
Original page

Keywords: geometrical distortion | picture coding | quality evaluation

The paper presents an analysis of the effects of lossy compression algorithms applied to images affected by geometrical distortion. It will be shown that the encoding-decoding process results in a nonhomogeneous image degradation in the geometrically corrected image, due to the different amount of information associated to each pixel. A distortion measure named quadtree distortion map (QDM) able to quantify this aspect is proposed. Furthermore, QDM is exploited to achieve adaptive compression of geometrically distorted pictures, in order to ensure a uniform quality on the final image. Tests are performed using JPEG and JPEG2000 coding standards in order to quantitatively and qualitatively assess the performance of the proposed method.
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