HEVC低位元率視訊編碼之研究;Low Bitrate Video Coding for HEVC

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题名:	HEVC低位元率視訊編碼之研究;Low Bitrate Video Coding for HEVC
作者:	張惟焜;Chang,Wei-kun
贡献者:	通訊工程學系
关键词:	HEVC;低位元率;模式決策;HEVC;Low Bitrate;Mode Decision
日期:	2014-07-24
上传时间:	2014-10-15 17:02:31 (UTC+8)
出版者:	國立中央大學
摘要:	近年來，愈來愈多裝載高解析度裝置諸如智慧型手機、平板電腦及數位相機等，伴隨高解析度而來的是龐大的資料量，所以視訊壓縮技術儼然成為一門重要的課題。目前最新的視訊壓縮技術HEVC(High Efficiency Video Coding)，雖然比起以往的H.264/AVC有更好的壓縮率，但其編碼複雜度也增加許多。本論文為了降低編碼運算複雜度，所以提出簡單型零區塊模式決策演算法(Simple Zero Block Mode Decision, S_ZBMD)，利用零區塊的分佈特性，來選擇合適區塊大小及預測模式，以提前終止CU遞迴的切割來達到節省編碼時間之目的。為了提升HEVC標準架構的編碼效益，利用改良型雙向絕對誤差和(Modified Sum of Absolute Bi-Prediction Differences, MSABPD)演算法，以節省編碼傳輸位元。最後將MSABPD與S_ZBMD結合，由數據結果顯示，在低位元率下可以節省30.6%的編碼時間，BDBR又可以節省2.56%。;In recent years, lots of high resolution devices, such as smart phones, tablet, and digital camera…etc. Video compression technology becomes an important issue due to the significant increasing of data storage. A new generation of video compression standard HEVC has better performance than H.264. HEVC has improved video quality and compression efficiency, but the coding complexity also increases a lot. In this thesis, we proposed Simple Zero Block Mode Decision(S_ZBMD) in inter prediction to reduce HEVC computation complexity. We early terminate the CU size by using zero block distribution to select suitable block size and prediction mode for coding time saving. In order to improve the coding efficiency of standard HEVC, we use Modified Sum of Absolute Bi-Prediction Differences algorithm (MSABPD) to save transmitted bits. We eventually combine MSABPD and S_ZBMD to achieve both efficiency improving and time saving. Experimental results show that our proposed algorithm achieve 30.6% time saving and 2.56% BDBR saving compared with HEVC encoder in low bitrate.
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