Analiza učinkovitosti kodiranja videa po standardu HEVC

HRVATIN, RUDI (author), Košir, Andrej (mentor)

Video kodiranje je že dlje časa uveljavljen postopek za prenašanje in shranjevanje video vsebin. Ključno vlogo pri video kodiranju igrajo kodirniki, ki na različne načine stiskajo video posnetke. To diplomsko delo se osredotoča na primerjavo dveh kodirnih postopkov, H.264/MPEG4-AVC in HEVC. H.264/MPEG4-AVC je standard, ki se trenutno najpogosteje uporablja za kodiranje video posnetkov, pred kratkim pa je izšel nov standard HEVC, ki naj bi izboljšal kodirno učinkovitost. Cilj je analizirati nov kodirni standard HEVC in ga primerjati s trenutnim standardom, H.264/MPEG4-AVC. Za primerjavo smo uporabili dve objektivni meri za oceno video kvalitete, PSNR in SSIM. PSNR se osredotoča na primerjavo posameznih slikovnih elementov, brez ozira na korelacijo med sosednjimi slikovnimi elementi. SSIM pa razširi območje primerjave in upošteva tudi območje slikovnih elementov ter tako vrne rezultate, ki so bolj primerljivi s človeško zaznavo video kvalitete. Ugotovili smo, da nov standard dosega svoja pričakovanja pri Full HD vsebinah, kjer pri isti kvaliteti videa porabimo pol manjšo pasovno širino za prenos ali shranjevanje videa v primerjavi s H.264/MPEG4-AVC.

• Language: Slovenian
• Keywords: video kodiranje, HEVC, H.264/MPEG4-AVC, video, SSIM, PSNR
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2015
• PID: 20.500.12556/RUL-30735
• Publication date in RUL: 24.04.2015

Secondary language

• Language: English
• Title: Video coding efficiency analysis of HEVC standard

Abstract

Video coding is a well-known procedure used for transporting and saving videos. The key role in video coding is performed by video codecs, which compress videos in a number of ways. This diploma thesis is focused on the comparison between two different coding standards, H.264/MPEG4-AVC and HEVC. H.264/MPEG4-AVC is the most widespread video coding standard currently adopted by the industry. Recently, a new standard was released, HEVC, which is believed to improve the coding efficiency by 50 % compared to H.264/MPEG4-AVC. The goal is to analyse the new HEVC coding standard and compare it to the currently used H.264/MPEG4-AVC standard. Two objective video quality metrics were used in the process, PSNR and SSIM. PSNR focuses on the comparison between single pixels, with no regard to the neighbouring pixels, whereas SSIM enlarges the area of comparison by taking into account a bigger area of pixels and gives results that are well correlated to the human visual system and its perception of quality. The results show that the new HEVC standard meets the expectations for Full HD videos, where compared to H.264/MPEG4-AVC half of the bandwidth is used for the same video quality.

• Keywords: video coding, HEVC, H.264/MPEG4-AVC, video, SSIM, PSNR