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研究生:黃延郎
研究生(外文):Yen-Lang Huang
論文名稱:JPEG2000錯誤容忍度之研究
論文名稱(外文):The Study of Error-Resilience in JPEG2000
指導教授:詹寶珠詹寶珠引用關係
指導教授(外文):Pau-Choo Chung
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電機工程學系碩博士班
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:2002
畢業學年度:90
語文別:英文
論文頁數:61
中文關鍵詞:錯誤容忍度
外文關鍵詞:Error-Resilience
相關次數:
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  在JPEG2000中,錯誤容忍度(Error-Resilience)的作法是採將同步標記(Resynchronization marker)加在precinct header的前後,其能夠保護的資料流(data stream)僅能以一個precinct為單位,而在JPEG2000中,一個precinct往往是組成較大一級的圖解析度(每大一級為原解析度4倍)或更佳品質(可由使用者決定)所必需的資訊,使得當發生錯誤時,這樣的作法無法解回一個在應用上完整的圖像(完整解析度或完整的品質)。因此我們提出了一個方法稱之Uneven Block-sized Information Included Marker (UBIIM) 做為JPEG2000上錯誤容忍度的新作法。在新做法中,我們在每個區塊(code-block)之後緊接著插入了一個具附加資訊的識別字,我們稱之為IIM,也因此,我們保護資料流將縮小到以區塊為單位。此IIM不但具同步標記的功能,並且附加了DC Index和AC Index兩個資訊;其中DC Index是從其對應區塊的鄰近區塊中找到一個像素值和其最為接近的區塊,而AC Index是由其對應區塊相對位置處但高一階層(level)中找到一個紋路相近的參考區塊。當發生錯誤時,我們會利用IIM中的DC Index和AC Index計算出一個新區塊來代替錯誤的區塊,而達到有效的錯誤隱藏(Error-Concealment)。同時,為了防止當採用加入IIM時會降低壓縮比,我們根據資料的重要性,採用Uneven code-block size來有效地插入IIM;即在比較重要的資料中插入較多的IIM,而在比較不重要的資料中插入較少的IIM。如此一來,我們就可以減少IIM使用量,但仍然可以達到足夠的錯誤容忍能力。
  In traditional JPEG2000, we insert resynchronization markers into the head and the tail of a precinct to achieve the error-resilience. As such, it can protect other precincts when a precinct is affected by errors. However, a precinct is a necessary unit to form a higher-level resolution (One higher-level resolution is 4 times as the primitive resolution) or a better-quality image. (User can classify different-layer qualities) Therefore, we propose a UBIIM (Uneven Block-sized Information Included Marker), in which we put an IIM follows each code-block. Thus, IIM can not only protect other code-blocks when a code-block is affected by errors, but also provide an error-concealment via DC Index and AC Index included within IIM. DC Index is used to indicate one of the neighboring blocks of the erroneous block, and pixel values of the block will be most similar as the erroneous block. AC Index is used to indicate the block in the corresponding position of the erroneous block in the same subband of one-higher level, and pixel value distribution of the block is similar as the erroneous block. When errors occur, we will form a new block to replace the erroneous block by DC Index and AC Index of IIM, as such, we can achieve error-concealment. Moreover, to avoid the heavy overhead by adopting the proposed UBIIM, the uneven code-block size is used to efficiently arrange where IIMs are inserted. We insert more IIMs into more important data and insert less IIMs into less important data to reduce the number of IIMs. As such, we can reserve the ability of error-resilience when reducing the number of IIMs.
摘要……………………………………………………………V
Abstract………………………………………………………VII
Acknowledgement……………………………………………VIII
List of Tables…………………………………………………IX
List of Figures…………………………………………………XII

Chapter 1 Introduction…………………………………………1

Chapter 2 JPEG2000 and Its Error-Resilience…………………5
  2-1 Main procedures in JPEG2000………………………5
  2-2 Error-Resilience in JPEG2000……………………… 9

Chapter 3 Uneven Block sized Information Included Marker…18
  3-1 Uneven code-block size……………………………18
  3-2 Information Included Marker………………………27

Chapter 4 Experimental Results………………………………40

Chapter 5 Conclusion…………………………………………56

Reference………………………………………………………58
Vita……………………………………………………………61
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