Documents disponibles écrits par cet auteur

Improved BSDL-based content adaptation for JPEG 2000 and HD Photo (JPEG XR) / Wesley De Neve in Signal processing. Image communication, Vol. 24 N° 6 (Juillet 2009) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 24 N° 6 (Juillet 2009) . - pp. 452-467 Titre : Improved BSDL-based content adaptation for JPEG 2000 and HD Photo (JPEG XR) Type de document : texte imprimé Auteurs : Wesley De Neve, Auteur ; Davy Van Deursen, Auteur ; Wim Van Lancker, Auteur Article en page(s) : pp. 452-467 Note générale : Electronique Langues : Anglais (eng) Mots-clés : BSDL  Content  adaptation  HD  Photo  JPEG  2000  JPEG  XR  STX  XML Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs Résumé : JPEG 2000 and HD Photo (JPEG XR) enable the coding of images with several adaptivity provisions. These provisions allow taking into account the constraints of diverse usage environments. However, the actual adaptation of the coded bitstreams requires additional system complexity. This paper investigates how JPEG 2000 and HD Photo can be used in a standardized and XML-based framework for format-independent content adaptation in the compressed domain. An analysis is provided of the cost of providing adaptivity in the compressed domain, in terms of loss of coding efficiency, as well as in terms of the complexity of the format-agnostic adaptation system used. This complexity is expressed in terms of execution times, memory consumption, and file size overhead of the XML descriptions. Using the outcome of our analysis, a number of improvements are proposed that allow reducing the complexity of XML-based adaptation for JPEG 2000 and HD Photo, in particular the use of compact XML descriptions and an adaptation chain based on the Simple API for XML (SAX). Compact XML descriptions contain a minimal amount of information for the purpose of adaptation—their use is enabled by introducing an additional lightweight pre- and post-processing step in the overall adaptation chain. Our results show that editing-style operations on JPEG 2000 and HD Photo bitstreams can be executed with a feasible complexity when relying on compact XML descriptions. These editing-style operations include exploiting spatial and quality scalability, as well as interactive extraction of regions-of-interest (ROIs). However, low-level operations in the compressed domain, such as rotating an image, cannot be supported, due to the need for entropy decoding and data reordering at macroblock or codeblock level. DEWEY : 361.382 ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...] [article] Improved BSDL-based content adaptation for JPEG 2000 and HD Photo (JPEG XR) [texte imprimé] / Wesley De Neve, Auteur ; Davy Van Deursen, Auteur ; Wim Van Lancker, Auteur . - pp. 452-467. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 24 N° 6 (Juillet 2009) . - pp. 452-467 Mots-clés : BSDL  Content  adaptation  HD  Photo  JPEG  2000  JPEG  XR  STX  XML Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs Résumé : JPEG 2000 and HD Photo (JPEG XR) enable the coding of images with several adaptivity provisions. These provisions allow taking into account the constraints of diverse usage environments. However, the actual adaptation of the coded bitstreams requires additional system complexity. This paper investigates how JPEG 2000 and HD Photo can be used in a standardized and XML-based framework for format-independent content adaptation in the compressed domain. An analysis is provided of the cost of providing adaptivity in the compressed domain, in terms of loss of coding efficiency, as well as in terms of the complexity of the format-agnostic adaptation system used. This complexity is expressed in terms of execution times, memory consumption, and file size overhead of the XML descriptions. Using the outcome of our analysis, a number of improvements are proposed that allow reducing the complexity of XML-based adaptation for JPEG 2000 and HD Photo, in particular the use of compact XML descriptions and an adaptation chain based on the Simple API for XML (SAX). Compact XML descriptions contain a minimal amount of information for the purpose of adaptation—their use is enabled by introducing an additional lightweight pre- and post-processing step in the overall adaptation chain. Our results show that editing-style operations on JPEG 2000 and HD Photo bitstreams can be executed with a feasible complexity when relying on compact XML descriptions. These editing-style operations include exploiting spatial and quality scalability, as well as interactive extraction of regions-of-interest (ROIs). However, low-level operations in the compressed domain, such as rotating an image, cannot be supported, due to the need for entropy decoding and data reordering at macroblock or codeblock level. DEWEY : 361.382 ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

Tag refinement in an image folksonomy using visual similarity and tag co-occurrence statistics / Sihyoung Lee in Signal processing. Image communication, Vol. 25 N° 10 (Novembre 2010) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 25 N° 10 (Novembre 2010) . - pp. 761–773 Titre : Tag refinement in an image folksonomy using visual similarity and tag co-occurrence statistics Type de document : texte imprimé Auteurs : Sihyoung Lee, Auteur ; Wesley De Neve, Auteur ; Yong Man Ro, Auteur Année de publication : 2012 Article en page(s) : pp. 761–773 Note générale : Electronique Langues : Anglais (eng) Mots-clés : Co-occurrence  Folksonomy  Recommendation  Refinement  Visual  similarity Résumé : Noisy tag assignments lower the effectiveness of multimedia applications that rely on the availability of user-supplied tags for retrieving user-contributed images for further processing. This paper discusses a novel tag refinement technique that aims at differentiating noisy tag assignments from correct tag assignments. The correctness of tag assignments is determined through the combined use of visual similarity and tag co-occurrence statistics. To verify the effectiveness of our tag refinement technique, experiments were performed with user-contributed images retrieved from Flickr. For the image set used, the proposed tag refinement technique reduces the number of noisy tag assignments with 36% (benefit), while removing 10% of the correct tag assignments (cost). In addition, our tag refinement technique increases the effectiveness of tag recommendation for non-annotated images with 45% when using the P@5 metric and with 41% when using the NDCG metric. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510001098 [article] Tag refinement in an image folksonomy using visual similarity and tag co-occurrence statistics [texte imprimé] / Sihyoung Lee, Auteur ; Wesley De Neve, Auteur ; Yong Man Ro, Auteur . - 2012 . - pp. 761–773. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 25 N° 10 (Novembre 2010) . - pp. 761–773 Mots-clés : Co-occurrence  Folksonomy  Recommendation  Refinement  Visual  similarity Résumé : Noisy tag assignments lower the effectiveness of multimedia applications that rely on the availability of user-supplied tags for retrieving user-contributed images for further processing. This paper discusses a novel tag refinement technique that aims at differentiating noisy tag assignments from correct tag assignments. The correctness of tag assignments is determined through the combined use of visual similarity and tag co-occurrence statistics. To verify the effectiveness of our tag refinement technique, experiments were performed with user-contributed images retrieved from Flickr. For the image set used, the proposed tag refinement technique reduces the number of noisy tag assignments with 36% (benefit), while removing 10% of the correct tag assignments (cost). In addition, our tag refinement technique increases the effectiveness of tag recommendation for non-annotated images with 45% when using the P@5 metric and with 41% when using the NDCG metric. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510001098