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研究生:林秀菊
研究生(外文):Shiow-Jyu Lin
論文名稱:區塊可適性錯誤隱藏技術在MPEG-4視訊之應用
論文名稱(外文):Block Adaptive Error Concealment Techniques for
指導教授:蔣廸豪
指導教授(外文):Tihao Chiang
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電資學院學程碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:76
中文關鍵詞:區塊可適性錯誤隱藏技術區隔錯誤蔓延錯誤彈性回復機制受損區塊型態自源再生
外文關鍵詞:Block Adaptive Error Concealment TechniquesError LocalizationError resilienceCorrupted MBs PatternIntra refresh
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透過網際網路之佈局,將串流影音媒體傳送到使用者端,逐漸成為目前視訊應用的趨勢並且遍及在可取用IP的網路環境裡。符合IP環境之串流媒體內容封包要求即時傳遞,且容許合理範圍內之封包遺失的傳輸損益。傳輸受損區的錯誤隱藏技術有助於還原、回復傳輸影像資訊。本論文將研討錯誤隱藏處理技術在不同之復原影像資訊的真確性下,空間資訊與位移向量資訊的再利用性對於可回復之傳輸影像品質的影響程度。因此,我們運用解碼過程之衍生資訊,以取得較為精確的出錯資訊,作為錯誤隱藏後處理方法探討的基礎。再針對畫面編碼與宏區塊編碼模式之差異,提出區塊可適性錯誤隱藏技術,並且實現於MPEG-4視訊解碼器中。對於目前處理之區塊,錯誤隱藏技術可以依據目前處理畫面之編碼型態與位置、目前處理畫面中可正確解碼之區塊數佔整各畫面之比例、鄰近於目前處理區塊的可信任之解碼區塊、目前處理畫面之所屬的景等因素找尋最適當之錯誤補償區塊,以增進整體錯誤回復力。實驗也證明透過所提之方法,在有位元資訊錯誤的情況下,我們可以重建MPEG-4視訊畫面至可接受的品質。
Streaming media over the Internet to users is getting popular for visual applications in IP network environment. The media content packets are delivered in real-time with a reasonable range of packet loss rate. Since the transmitted content packets may be lost over the Internet, error concealment can recover received video to proper subjective quality. This thesis studies on the quality recovery capability of the error concealment techniques under the assumption that the lost spatial and temporal information are known in priori. Thus, the accurate spatial and motion vector information can be used for error recovery. Based on the derived information, coding pattern of each frame and coding mode of macroblocks, we present a block adaptive error concealment (BAEC) technique, which can search for the most suitable error compensated macroblock based on the frame coding, the frame position, the ratio of correctly decoded macro-blocks in a frame, the data of neighbored and reliable decoded macro-blocks, and the latest handled visual content. BAEC has been realized on MPEG-4 reference software for performance evaluation. The experiment results show that BAEC is applicable to the streaming of MPEG-4 compliant bitsreams for proper picture quality.
一、緒論 1
1.1研究動機 1
1.2 相關文獻研讀 2
1.3方法簡介 3
1.4論文組織 4
二、MPEG 影像壓縮概念 5
2.1壓縮基礎概念 5
2.1.1影像訊號與取樣格式 5
2.1.2 轉換(Transformation) 5
2.1.3 量化 6
2.1.4 資料壓縮 6
2.2 幅際編碼與位移補償 8
2.2.1階層資料結構 8
2.2.2位元流語意結構 9
2.2.3位移資訊 10
2.2.4宏區塊編碼模式 11
2.2.5幅際編碼之殘影量化 11
2.2.6紋理編碼、解碼架構 12
2.3版本訴求與新增特性 14
2.3.1視覺位元流語法與語意 14
2.3.2位移估測與補償 15
2.3.3時間、空間域可調功能 17
2.3.4編碼、解碼架構 18
三、錯誤偵測與隱藏技術 20
3.1錯誤偵測 20
3.2 錯誤回復機制(Error Resilience and Recovery) 21
3.2.1可能的抗錯系統機制 21
3.2.2區隔錯誤蔓延方法(Error Localization) 23
3.2.3 MPEG-4錯誤回復機制 24
3.3錯誤隱藏 24
3.3.1時間軸向錯隱 25
3.3.2空間面向錯隱 25
3.3.3頻率領域錯隱 28
四、區塊可適性隱藏技術 31
4.1原理的闡述(Rationale) 31
4.2 基本架構 31
4.3錯誤偵測與局部化之基本假設 32
4.4 主要錯誤補償之演算法 33
4.4.1順解驗證(crash proof)程序 33
4.4.2整幅畫面錯誤隱藏 34
4.4.3位移資訊之回復 35
4.4.4局部換景補償 37
4.4.5 空間補償 38
五、實驗與結果 44
5.1實驗平臺 44
5.2完美假設與非完美假設 44
5.3實驗說明 44
5.4測試位元流參數設定 44
5.5實驗數據與比較分析 46
5.5.1實驗數據 46
5.5.2數據分析 71
5.6成果節錄 72
六、結論與未來研究方向 73
參考文獻 74
自傳 76
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