適用於無比率無線網路廣播的H.264可調式視訊編碼分層擷取與非均等抹除保護碼之共同設計

Joint Design of H.264 SVC/MGS Encoding, Extraction and Unequal Erasure Protection for Rateless Wireless Broadcasting

邱志明(Chih-Ming Chiu)

指導教授 ： 邵家健

國立交通大學/資訊學院/資訊科學與工程研究所/碩士(2011年)

https://doi.org/10.6842/NCTU.2011.01094

摘要

此研究的目的在於針對可調式視訊編碼提供適當的分層擷取策略以及與其擷取層相對應的無比率非均等抹除保護碼的傳輸系統。由此產生的位元流無須重新壓縮即可用於損耗性廣播環境並可達到近似位元率-失真最佳化的效能。
在無線網路廣播環境中傳輸可調式視訊編碼位元流需要在網路傳輸層中實現非均等抹除保護來應付廣泛的畫面錯誤率，以確保在撥放影像畫面時能達到優雅化降級。
此篇論文中，我們提出了一個新的可調式視訊編碼位元率-失真最佳化的分層擷取與無比率非均等抹除保護碼之共同設計系統，用以實現可調式視訊編碼之無線廣播。透過分析可調式視訊編碼位元流實驗的結果，歸納出無比率非均等抹除保護碼的設計需求。同時我們建立一個以圖像群組為基底的位元率-失真最佳化之分層擷取模型。透過此模型，在給定某一非均等抹除保護碼效能下找出最佳的視訊分層擷取結果。

關鍵字

可調式視訊編碼 ； 非均等抹除保護碼 ； 無比率通道編碼 ； 無線網路廣播 ； 位元流擷取

並列摘要

This study aims to supple¬ment Scalable Video Coding (SVC) with the proper ex¬traction of SVC-NAL units and the corresponding UEP channel coding of extracted layers, so that the resultant bit¬-streams can exhibit near-optimal rate-distortion perfor¬mance in lossy broad-casting environments without the need of re-encoding the SVC bit¬streams.
In this thesis, we propose a novel joint design system of SVC/MGS optimized rate-distortion extraction and Rateless UEP code to endow wireless SVC broadcasting. Through the analysis of SVC bit-streams, we obtained the design requirements of Rateless UEP code. And then we build a group of pictures (GOP) based rate-distortion optimized extraction model under a certain UEP code.

並列關鍵字

Scalable video coding ； UEP ； Rateless channel code ； Wireless broadcasting ； Bitstream extraction

參考文獻

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