Documents disponibles écrits par cet auteur

Content-partitioned structural similarity index for image quality assessment / Chaofeng Li in Signal processing. Image communication, Vol. 25 N° 7 (Août 2010) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 25 N° 7 (Août 2010) . - pp. 517–526 Titre : Content-partitioned structural similarity index for image quality assessment Type de document : texte imprimé Auteurs : Chaofeng Li, Auteur ; Alan C. Bovik, Auteur Année de publication : 2012 Article en page(s) : pp. 517–526 Note générale : Electronique Langues : Anglais (eng) Mots-clés : Four-component  image  model  Image  quality  assessment  Structural  similarity  (SSIM)  Multi-scale  structural  similarity  (MS-SSIM)  Gradient  structural  similarity  (G-SSIM) Résumé : The assessment of image quality is important in numerous image processing applications. Two prominent examples, the Structural Similarity Image (SSIM) index and Multi-scale Structural Similarity (MS-SSIM) operate under the assumption that human visual perception is highly adapted for extracting structural information from a scene. Results in large human studies have shown that these quality indices perform very well relative to other methods. However, the performance of SSIM and other Image Quality Assessment (IQA) algorithms are less effective when used to rate blurred and noisy images. We address this defect by considering a four-component image model that classifies image local regions according to edge and smoothness properties. In our approach, SSIM scores are weighted by region type, leading to modified versions of (G-)SSIM and MS-(G-)SSIM, called four-component (G-)SSIM (4-(G-)SSIM) and four-component MS-(G-)SSIM (4-MS-(G-)SSIM). Our experimental results show that our new approach provides results that are highly consistent with human subjective judgment of the quality of blurred and noisy images, and also deliver better overall performance than (G-)SSIM and MS-(G-)SSIM on the LIVE Image Quality Assessment Database. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000354 [article] Content-partitioned structural similarity index for image quality assessment [texte imprimé] / Chaofeng Li, Auteur ; Alan C. Bovik, Auteur . - 2012 . - pp. 517–526. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 25 N° 7 (Août 2010) . - pp. 517–526 Mots-clés : Four-component  image  model  Image  quality  assessment  Structural  similarity  (SSIM)  Multi-scale  structural  similarity  (MS-SSIM)  Gradient  structural  similarity  (G-SSIM) Résumé : The assessment of image quality is important in numerous image processing applications. Two prominent examples, the Structural Similarity Image (SSIM) index and Multi-scale Structural Similarity (MS-SSIM) operate under the assumption that human visual perception is highly adapted for extracting structural information from a scene. Results in large human studies have shown that these quality indices perform very well relative to other methods. However, the performance of SSIM and other Image Quality Assessment (IQA) algorithms are less effective when used to rate blurred and noisy images. We address this defect by considering a four-component image model that classifies image local regions according to edge and smoothness properties. In our approach, SSIM scores are weighted by region type, leading to modified versions of (G-)SSIM and MS-(G-)SSIM, called four-component (G-)SSIM (4-(G-)SSIM) and four-component MS-(G-)SSIM (4-MS-(G-)SSIM). Our experimental results show that our new approach provides results that are highly consistent with human subjective judgment of the quality of blurred and noisy images, and also deliver better overall performance than (G-)SSIM and MS-(G-)SSIM on the LIVE Image Quality Assessment Database. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000354