在視訊壓縮的議題中，若是使用動態估測的技術去壓縮視訊畫面間的影像資訊，最重要的要求是要能有效且快速的計算出移動補償資訊，如此才能進一步的契合現今的網路視訊應用，例如視訊會議系統或是隨選視訊系統。本論文提出一個應用在動態估測技術中新的快速搜尋演算法，名為雞尾酒搜尋法。這樣的稱呼是因為所提出的新方法是匯集前人所提出的數個有用的想法，並且提出新的設計去積極地改善原本存在的問題，這使得此法不但能夠獲取既有的效果，更能夠因為既存問題的改善，而在效能和速度上獲得更多的增益。實驗結果顯示此雞尾酒搜尋法確實能夠更快速的得出較精確的移動補償資訊。

The performance and speed of the interframe motion estimation method for sequencial frame sequence compression are the important issues especially in networking application such as video conference and video on demand. In this paper, we proposed a new fast search algorithm for motion estimation on block matching technique called the cocktail search algorithm (CTS). This new algorithm takes advantages of prior search algorithms proposed in the literature and improves at our observations. The experiment results show that the proposed CTS algorithm can provide the better performance and require less computational costs than others. In other words, the CTS can obtain the accurate motion vector efficiently and fast. The fruitful results is achieved by not only holding the original benefit but also constructively improving the existing drawbacks.

Contents Page
Abstract……………………………………………………..………………………… i
List of Figures………………………………………………………………………… iii
List of Tables…………………………………………………………………………. iv
1. Introduction……………………………………………………………………… 1
1.1 Motivation and Recent Related Research…………………………………… 1
1.2 Summary of the Thesis……………………….……....….………………….. 3
1.3 Organization of the Thesis…………………….….…………………………. 3
2. Block Matching Motion Estimation……………….……………………………. 4
2.1 Motion Estimation Technique………………….………………....………… 4
2.2 Several Existing Search Algorithms for Block-Matching
2.2.1 Full Search Algorithm…………………….……….…………………. 7
2.2.2 Uniform Search Algorithm……………….……….………………….. 9
2.2.3 Center-Biased Search Algorithms……………………………………. 12
2.2.4 Minima Bounded Area Search Algorithm……………………………. 22
2.2.5 Speed Up Methods………………………….….……………...….…. 23
3. The CockTail Search Algorithm
3.1 Our new observation………….…………………..………………………… 28
3.2 The CockTail Search Algorithm………………..….……....……………….. 31
4. Simulation Results and Comparisons……………………….…….……………… 38
5. Conclusion and Further Research…………………….…….……………………. 44
Bibliography……………………………………………….………………………….. 45

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