?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Estudio+de+calidad+de+codificaci%C3%B3n+utilizando+los+perfiles+10+Bits+del+est%C3%A1ndar+H.264&rft.creator=Cabezas+Gonz%C3%A1lez%2C+Javier&rft.contributor=Eckert%2C+Martina&rft.subject=Computer+Science&rft.description=Desde+los+inicios+de+la+codificaci%C3%B3n+de+v%C3%ADdeo+digital+hasta+hoy%2C+tanto+la+se%C3%B1al+de+video+sin+comprimir+de+entrada+al+codificador+como+la+se%C3%B1al+de+salida+descomprimida+del%0D%0Adecodificador%2C+independientemente+de+su+resoluci%C3%B3n%2C+uso+de+submuestreo+en+los+planos+de+diferencia+de+color%2C+etc.+han+tenido+siempre+la+caracter%C3%ADstica+com%C3%BAn+de+utilizar+8+bits+para+representar+cada+una+de+las+muestras.+De+la+misma+manera%2C+los+est%C3%A1ndares+de+codificaci%C3%B3n+de+v%C3%ADdeo+imponen+trabajar+internamente+con+estos+8+bits+de+precisi%C3%B3n+interna+al+realizar+operaciones+con+las+muestras+cuando+a%C3%BAn+no+se+han+transformado+al+dominio+de+la+frecuencia.%0D%0ASin+embargo%2C+el+est%C3%A1ndar+H.264%2C+en+gran+auge+hoy+en+d%C3%ADa%2C+permite+en+algunos+de+sus+perfiles+orientados+al+mundo+profesional+codificar+v%C3%ADdeo+con+m%C3%A1s+de+8+bits+por+muestra.%0D%0ACuando+se+utilizan+estos+perfiles%2C+las+operaciones+efectuadas+sobre+las+muestras+todav%C3%ADa+sin+transformar+se+realizan+con+la+misma+precisi%C3%B3n+que+el+n%C3%BAmero+de+bits+del%0D%0Av%C3%ADdeo+de+entrada+al+codificador.+Este+aumento+de+precisi%C3%B3n+interna+tiene+el+potencial+de+permitir+unas+predicciones+m%C3%A1s+precisas%2C+reduciendo+el+residuo+a+codificar+y%0D%0Aaumentando+la+eficiencia+de+codificaci%C3%B3n+para+una+tasa+binaria+dada.%0D%0AEl+objetivo+de+este+Proyecto+Fin+de+Carrera+es+estudiar%2C+utilizando+las+medidas+de+calidad+visual+objetiva+PSNR+(Peak+Signal+to+Noise+Ratio%2C+relaci%C3%B3n+se%C3%B1al+ruido+de+pico)%0D%0Ay+SSIM+(Structural+Similarity%2C+similaridad+estructural)%2C+el+efecto+sobre+la+eficiencia+de+codificaci%C3%B3n+y+el+rendimiento+al+trabajar+con+una+cadena+de+codificaci%C3%B3n%2Fdescodificaci%C3%B3n+H.264+de+10+bits+en+comparaci%C3%B3n+con+una+cadena+tradicional+de+8+bits.%0D%0APara+ello+se+utiliza+el+codificador+de+c%C3%B3digo+abierto+x264%2C+capaz+de+codificar+video+de+8+y+10+bits+por+muestra+utilizando+los+perfiles+High%2C+High+10%2C+High+4%3A2%3A2+y+High+4%3A4%3A4+Predictive+del+est%C3%A1ndar+H.264.%0D%0ADebido+a+la+ausencia+de+herramientas+adecuadas+para+calcular+las+medidas+PSNR+y+SSIM+de+v%C3%ADdeo+con+m%C3%A1s+de+8+bits+por+muestra+y+un+tipo+de+submuestreo+de+planos+de%0D%0Adiferencia+de+color+distinto+al+4%3A2%3A0%2C+como+parte+de+este+proyecto+se+desarrolla+tambi%C3%A9n+una+aplicaci%C3%B3n+de+an%C3%A1lisis+en+lenguaje+de+programaci%C3%B3n+C+capaz+de+calcular+dichas%0D%0Amedidas+a+partir+de+dos+archivos+de+v%C3%ADdeo+sin+comprimir+en+formato+YUV+o+Y4M.%0D%0AABSTRACT%0D%0ASince+the+beginning+of+digital+video+compression%2C+the+uncompressed+video+source+used+as+input+stream+to+the+encoder+and+the+uncompressed+decoded+output+stream+have%0D%0Aboth+used+8+bits+for+representing+each+sample%2C+independent+of+resolution%2C+chroma+subsampling+scheme+used%2C+etc.+In+the+same+way%2C+video+coding+standards+force+encoders+to+work+internally+with+8+bits+of+internal+precision+when+working+with+samples+before+being+transformed+to+the+frequency+domain.%0D%0AHowever%2C+the+H.264+standard+allows+coding+video+with+more+than+8+bits+per+sample+in+some+of+its+professionally+oriented+profiles.+When+using+these+profiles%2C+all+work+on%0D%0Asamples+still+in+the+spatial+domain+is+done+with+the+same+precision+the+input+video+has.%0D%0AThis+increase+in+internal+precision+has+the+potential+of+allowing+more+precise+predictions%2C+reducing+the+residual+to+be+encoded%2C+and+thus+increasing+coding+efficiency+for+a+given+bitrate.%0D%0AThe+goal+of+this+Project+is+to+study%2C+using+PSNR+(Peak+Signal+to+Noise+Ratio)+and+SSIM+(Structural+Similarity)+objective+video+quality+metrics%2C+the+effects+on+coding+efficiency+and+performance+caused+by+using+an+H.264+10+bit+coding%2Fdecoding+chain+compared+to+a+traditional+8+bit+chain.+In+order+to+achieve+this+goal+the+open+source+x264+encoder+is+used%2C+which+allows+encoding+video+with+8+and+10+bits+per+sample+using+the+H.264+High%2C+High+10%2C+High+4%3A2%3A2+and+High+4%3A4%3A4+Predictive+profiles.%0D%0AGiven+that+no+proper+tools+exist+for+computing+PSNR+and+SSIM+values+of+video+with+more+than+8+bits+per+sample+and+chroma+subsampling+schemes+other+than+4%3A2%3A0%2C+an+analysis+application+written+in+the+C+programming+language+is+developed+as+part+of+this+Project.+This+application+is+able+to+compute+both+metrics+from+two+uncompressed+video+files+in+the+YUV+or+Y4M+format.&rft.publisher=E.U.I.T.+Telecomunicaci%C3%83%C2%B3n+(UPM)&rft.rights=https%3A%2F%2Fcreativecommons.org%2Flicenses%2Fby-nc-nd%2F3.0%2Fes%2F&rft.date=2012-09-25&rft.type=info%3Aeu-repo%2Fsemantics%2FbachelorThesis&rft.type=Final+Project&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=spa&rft.format=application%2Fzip&rft.language=spa&rft.rights=info%3Aeu-repo%2Fsemantics%2FopenAccess&rft.identifier=https%3A%2F%2Foa.upm.es%2F14048%2F