TY - JOUR AU - Costa, Cristina AU - De Natale, Francesco G.B. AU - Granelli, Fabrizio PY - 2004 DA - 2004/09/29 TI - Quality Evaluation and Nonuniform Compression of Geometrically Distorted Images Using the Quadtree Distortion Map JO - EURASIP Journal on Advances in Signal Processing SP - 470826 VL - 2004 IS - 12 AB - 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. SN - 1687-6180 UR - https://doi.org/10.1155/S1110865704402248 DO - 10.1155/S1110865704402248 ID - Costa2004 ER -