摘要：
針對目前視頻編碼標(biāo)準(zhǔn)和視頻編碼器較多、缺乏統(tǒng)一評價(jià)標(biāo)準(zhǔn)和客觀評價(jià)結(jié)果的問題,提出了使用視頻質(zhì)量、編碼速度、碼率節(jié)省百分比、內(nèi)存占用等指標(biāo)相結(jié)合的評價(jià)體系,同時(shí)給出了評測平臺的搭建方法.采用多個(gè)不同的公開視頻序列為測試源,選取常見的H.264/MPEG-AVC、H.265/MPEG-HEVC、VP8、VP9標(biāo)準(zhǔn)和基于小波的Hitav對應(yīng)的編碼器搭建評測平臺對各編碼器進(jìn)行性能評價(jià)實(shí)驗(yàn).實(shí)驗(yàn)表明,H.265和VP9在視頻質(zhì)量、碼流節(jié)省方面表現(xiàn)優(yōu)異,但復(fù)雜度過高;H.264復(fù)雜度低且在低分辨率和簡單視頻場景表現(xiàn)優(yōu)異;Hitav對高分辨高復(fù)雜度視頻序列處理較好.結(jié)果表明提出的評價(jià)體系和測試平臺搭建方法可以很好地用于視頻編碼器的性能評價(jià).%For the lack of unified evaluation standard and objective evaluation results of various video standards and video encoders at present,this paper proposed an evaluation framework combined with indicators like video quality,coding speed,bitrate saving percentage and memory cost,etc,and provided the ways to construct an evaluation platform at the same time.It adop-ted multiple different open video sequences as test sources,and selected corresponding video encoders of common video standards,including H.264/MPEG-AVC,H.265/MPEG-HEVC,VP8 and VP9,and Hitav based on wavelet,to build an evaluation platform and conducted evaluation experiments of encoders' performance.The experiments show that H.265 and VP9 express outstanding performance in video quality and bitrate savings but with very high complexity,H.264 has low complexity performs excellent in simple scenes,Hitav is good at dealing with the videos with high complexity and high space resolutions.The results show that the proposed evaluation framework and methods of constructing evaluation platform are very suitable for performance evaluation of video encoders.
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