{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-E1EHF55K/151ac449-595d-4ca2-8403-a36fcfc26678/HTML","dcterms:extent":"28 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-E1EHF55K/d9a2bb07-1df7-4832-9610-a86bc8487522/PDF","dcterms:extent":"1035 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-E1EHF55K/94b4cf71-9f11-4c64-8f3f-ad74e045f081/TEXT","dcterms:extent":"26 KB"}],"edm:TimeSpan":{"@rdf:about":"2006-2025","edm:begin":{"@xml:lang":"en","#text":"2006"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:DOC-E1EHF55K","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/urn:nbn:si:spr-0y5dimiu"},{"@xml:lang":"sl","#text":"Elektrotehniški vestnik"}],"dcterms:issued":"2007","dc:creator":["Hebar, Marko","Planinšič, Peter"],"dc:format":[{"@xml:lang":"sl","#text":"številka:4"},{"@xml:lang":"sl","#text":"6 strani"},{"@xml:lang":"sl","#text":"letnik:74"},{"@xml:lang":"sl","#text":"str. 171-176"}],"dc:identifier":["ISSN:0013-5852","COBISSID:12009238","ISSN:2232-3236","URN:URN:NBN:SI:doc-E1EHF55K"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Elektrotehniška zveza Slovenije"},"dc:subject":[{"@xml:lang":"sl","#text":"digitalna tehnika"},{"@xml:lang":"sl","#text":"kodek"},{"@xml:lang":"sl","#text":"kvaliteta"},{"@xml:lang":"sl","#text":"obdelava slik"},{"@xml:lang":"sl","#text":"video"},{"@rdf:resource":"http://www.wikidata.org/entity/Q34508"}],"dcterms:temporal":{"@rdf:resource":"2006-2025"},"dc:title":{"@xml:lang":"sl","#text":"Comparison of video codecs and coded video sequences quality using the latest objective and subjective assessment methods| Primerjava videokodekov in kodiranih videosekvenc z novejšimi objektivnimi in subjektivnimi metodami ocenjevanja|"},"dc:description":[{"@xml:lang":"sl","#text":"This paper presents the comparisons of the latest subjective video sequence quality assessment methods versus objective quality assessment using H.261, H.263+ and H.264 advanced video coding (A VC). A Simultaneous Double Stimulus for Continuous Evaluation (SDSCE) method was used for subjective quality assessment. The Peak Signal to Noise Ratio (PSNR) method and the-state-of-the art Structural SIMilarity index method (SSIM) were used for objective quality assessment. The reconstructed video sequences are obtained using H.261, H.263+, H.264 standards encoded to different bit rates ranging from 512 kbit/s through 4096 kbit/s. Results show that the methods SSIM and PSNR are better for high bit rate video assessment and SDSCE for low bit rate video assessment. The SSIM method gives more realistic results than PSNR method. Also compared are H.261, H.263+ and H.264 which is new generation codec and is superior to the older standard codecs"},{"@xml:lang":"sl","#text":"Članek predstavlja subjektivno in objektivno ocenjevanje kakovosti video sekvenc, kodiranih s H.261, H.263+ in H.264 3, 4, 5. Za subjektivno ocenjevanja videosekvenc smo uporabili metodo simultanega dvojnega stimuliranega nenehnega ocenjevanja (SDSCE), za objektivno ocenjevanje pa metodi vršnega razmerja med signalom in sumom (PSNR) po enačbi (2) in indeks podobnosti strukture (SSIM) po enačbah (3), (4), (5), (6). Metoda SSIM meri strukturno razliko med kodirano in originalno sliko videosekvenc. V članku smo predstavili le dve izbrani videosekvenci, kodirani s kodeki H.261, H.263+, H.264. Sekvence smo kodirali pri bitnih hitrostih, med 512 kbit/s in 4096 kbit/s in jih nato ocenjevali z objektivnima in subjektivno metodo. Rezultati ocenjevanja so prikazani v tabeli 1 in na slikah 7, 8. Rezultati kažejo, da sta metodi SSIM in PSNR primernejši za ocenjevanje pri višjih bitnih hitrostih. Pri nižjih bitnih hitrostih je primernejša metoda SDSCE, ki da pri velikih popačenjih realnejše ocene kot objektivni metodi. Primerjave med kodeki potrjujejo, da ima kodek H.264 v vseh pogledih premoč glede na oba predhodnika"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:DOC-E1EHF55K","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-E1EHF55K"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-E1EHF55K/d9a2bb07-1df7-4832-9610-a86bc8487522/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Elektrotehniška zveza Slovenije"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:DOC-E1EHF55K/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-E1EHF55K"}}}}