标题: | 建構於階層式B幀的混合式多重描述編碼 Hybrid Multiple Description Coding Based on Hierarchical B Pictures |
作者: | 游顥榆 You, Hao-Yu 蔡文錦 Tsai, Wen-Jiin 資訊科學與工程研究所 |
关键字: | 多重描述編碼;階層式B幀;空間分割;時域分割;重複法;Multiple description coding (MDC);hierarchical B pictures;spatial splitting;temporal splitting;duplication |
公开日期: | 2010 |
摘要: | 當視訊資料透過易發生傳輸錯誤的網路傳輸時,多重描述視訊編碼就是一種用於降低錯誤影響的技術。在多重描述編碼上有著許多的方法,都勢必考量到編碼效能與錯誤恢復,並在其中取得一個最好的平衡點。而在此篇論文中,我們提出了一種架構於階層式B幀混合式的多重描述編碼技術。 在混合式多重描述編碼架構模型上,我們利用了不同的多重描述編碼方法切割在不同架構下的幀,如重複法、空間域切割和時間域切割,考慮到不同階層下之不同重要性的幀,將其視訊來源編碼分割產生兩個描述子,當有描述子發生錯誤或遺失時,混合式多重描述編碼以不同的預估方式提供不同程度重要性的幀不平等的錯誤恢復。結果顯示,可以使得視訊在有效率的編碼效能下,達到較好的錯誤恢復。在理想無出錯的網路,或在網路隨機封包遺失的情況下,都可以顯示混合式多重描述編碼的優勢。 Multiple description video coding (MDC) is one of the approaches for reducing the detrimental effects caused by transmission over error-prone networks. In this paper, a MDC model based on hierarchical B pictures is proposed to optimize the tradeoff between coding efficiency and error resilience. The model produces two descriptors by applying different MDC techniques such as duplication, spatial splitting and temporal splitting on the different frames of video sequences, taking into account the unequal importance of the frames at different hierarchical levels. In case of data loss, the model takes advantages of different estimation methods in providing unequal error resilience for the frames with different degrees of importance. As a consequence, better error resilience can be achieved at high coding efficiency. The advantages of the proposed MDC model are demonstrated in error-free and packet loss networks. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT079755616 http://hdl.handle.net/11536/45962 |
显示于类别: | Thesis |
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