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• W2071484248 abstract "A general-purpose FR/NR-IQA scheme is proposed based on statistics in wavelet domain.High-peak and heavy-tailed behaviors of wavelet coefficients are modeled by SαS PDF.Quality can be measured using model parameters altered by the presence of distortion.A closed-form KLD of characteristic PDF is provided for IQA using model parameters.Model behavior through scales is studied to estimate reference information for NRIQA. Quality assessment is of central importance in numerous image processing tasks. State-of-the-art objective image quality assessment (IQA) algorithms are generally devised for specific distortion types or based on training procedure of large databases. In this work, we propose a general-purpose full-reference/no-reference (FR/NR) IQA framework for image distortions, nominated by Image Quality/Distortion Metric (IQDM). The leptokurtic and heavy-tailed behaviors of image wavelet coefficients are characterized by symmetric α-stable (SαS) density, and the statistical studies indicate that the model parameters may be altered because of the presence of distortion. This important priori knowledge of original image's distribution is then used to gauge the distortion between degraded and reference SαS models in multi-scale wavelet sub-bands. We investigate the relationship between original and degraded parameters over scales, accordingly infer the original parameters from the degraded ones. A characteristic probability density function for SαS and its closed-form Kullback-Leibler distance are derived for FR/NR-IQDM using the model parameters. Extensive experiments and comparisons demonstrate that the proposed FR/NR-IQDM scheme is efficacious to most common types of distortion, and leads to a highly comparable performance to the benchmarks and prevalent competitors in consistency with subjective judgements." @default.
• W2071484248 created "2016-06-24" @default.
• W2071484248 creator A5019708391 @default.
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• W2071484248 date "2014-10-01" @default.
• W2071484248 modified "2023-10-16" @default.
• W2071484248 title "Image quality/distortion metric based on α-stable model similarity in wavelet domain" @default.
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• W2071484248 doi "https://doi.org/10.1016/j.jvcir.2014.06.007" @default.
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