Analiza složenosti HEVC postupka kodiranja

master's thesis

• Title (english): Complexity analysis of HEVC coding method
• Author: Leon Ostrež
• Mentor: Sonja Grgić (mentor)
• Committee member: Sonja Grgić (predsjednik povjerenstva)
• Committee member: Tomislav Kos (član povjerenstva)
• Committee member: Emil Dumić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2015-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

H.265, odnosno HEVC, je norma za kompresiju videosekvenci koja polako počinje zamijenjivati dosadašnju H.264/AVC normu. U ovom radu obrađeni su osnovni elementi kodera: podjela slike, predviđanje slike, tranformacijsko i entropijsko kodiranje, te je norma uspoređena sa prethodnom H.264/AVC normom. Provedena su testiranja u ffmpeg programu na različitim sekvencama koje su kodirane različitim parametrima da bi se vidjelo kako oni utječu na složenost kodiranja i na kvalitetu slike. Utvrđeno je da porast brzine prijenosa povećava vrijeme kodiranja i kvalitetu slike odnosno SSIM i PSNR vrijednosti. Također biranje unaprijed postavljenih postavki utječe na sve segmente. Pokazalo se da je ultrafast postavka dosta smanjuje složenost kodiranja, ali i daje najmanju kvalitetu slike. Medium postavka malo povećava vrijeme kodiranja i kvalitetu kompresije u odnosu na ultrafast, dok slower jako puno utječe na povećanje složenosti i daje malo povećanje kvalitete slike.

Abstract (english)

H.265, or HEVC, is standard for compresion of video files that is starting to take place of H.264/AVC standard. In this paper are introduced main parts of coder: picture partitioning, picture prediction, transform coding and entropy coding. This standard is also compared to previous H.264 standard. Testings are made using ffmpeg program with various videos that are coded with different parameters so that we could see how they influence on coding complexity and picture quality. Results show that increasing bitrate gives better picture quality (SSIM and PSNR) and longer coding time. Also different presets affect all segments. It is shown that ultrafast preset lowers complexity of coding a lot, but gives lowest picture quality. Medium preset increases time of coding and compression quality by little comparing to ultrafast, while slower preset influence a lot on complexity and gives little quality increase.

• Keywords: HEVC; H.265; kompresija videosekvenci; koder; kvaliteta slike; vrijeme kodiranja; ffmpeg
• Keywords (english): HEVC; H.265; video compression; coder; picture quality; coding time; ffmpeg
• Language: croatian
• URN:NBN: urn:nbn:hr:168:691423
• Study programme: Title: Information and Communication Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije (magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2018-02-06 11:01:46