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研究生: 陳碩宏
Shou-Hung Chen
論文名稱: 即時視訊錄製系統設計
The Design of Real-Time Video Recording Systems
指導教授: 高文忠
Kao, Wen-Chung
學位類別: 碩士
Master
系所名稱: 機電工程學系
Department of Mechatronic Engineering
論文出版年: 2006
畢業學年度: 94
語文別: 中文
論文頁數: 88
中文關鍵詞: 自動曝光自動白平衡動態影像壓縮移動估測影像穩定數位影像穩定整體移動向量移動補償
英文關鍵詞: Auto exposure, Auto white balance, MPEG, Motion estimation, Image stabilization, Digital image stabilization, Global motion vector, Motion compensation
論文種類: 學術論文
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  • 本研究提出一個整合嵌入式軟體平台的動態影像錄製系統,此系統包含了自動曝光、自動白平衡與數位影像穩定器模組,以及典型的影像壓縮模組。隨著光源的亮度與色溫變化,自動曝光與自動白平衡程序充分利用影像壓縮過程所產生的有用資訊,完成準確而即時的影像估測與調整。所提出的數位影像穩定器演算法由二個部份所組成:一、整體移動估測,由影像畫面找出相機的震動或平移的整體移動向量;二、移動向量補償,依補償向量自原始影像擷取適當的影像區域。整體移動估測與動態影像壓縮分享相同的影像移動估測器,並且使用濾波器移除不穩定的移動向量。
    完整的演算法已經在可攜式的數位相機上實現,由實驗結果顯示所輸出的影像畫面呈現較佳的影像穩定情形。

    This research presents an integrated MPEG video recording system with embedded software platform. The system includes auto exposure, auto white balance, digital image stabilization modules, and other typical video compression modules. By fully utilizing the information obtained from video compression, the real-time auto exposure and auto white balance process can be accurately predicted the brightness as well as color temperature of the light source. The proposed digital image stabilization algorithm is composed of two phases: (1) estimating global motion vector which represents the camera vibration or panning in the scene and (2) compensating motion vector by relocating the cropped image raw data area. The global motion estimation shares the same motion estimator of MPEG encoder and adds a filter to remove the effects of unstable motion vector.

    中文摘要 i 英文摘要 ii 誌 謝 iii 圖 目 錄 vi 表 目 錄 viii 第 一 章 簡介 1 1.1 研究動機 1 1.2 相關研究 2 1.2.1 自動曝光與自動白平衡 2 1.2.2 影像穩定器的分類 5 1.2.3 數位影像穩定器的研究 7 1.3 目前方法的檢討 11 1.3.1 自動曝光與自動白平衡 11 1.3.2 數位影像穩定器 12 1.4 本研究的方法 14 1.4.1 自動曝光與自動白平衡模組 14 1.4.2 數位影像穩定器模組 15 1.4.3 動態影像壓縮模組 16 第 二 章 系統架構 18 2.1 硬體平台架構 18 2.2 軟體平台架構 20 2.3 演算法架構 21 2.4 演算法模組之相互關係 22 第 三 章 自動曝光與自動白平衡 24 3.1 相關的研究 25 3.1.1 適應性階級調整曝光值 25 3.1.2 以畫面中央區域評估曝光值與查表法 25 3.1.3 自動曝光採用畫面分區評估 27 3.1.4 白平衡實驗 28 3.1.5 長鏡頭場合的影像白平衡研究 29 3.1.6 低亮度場合的影像白平衡研究 30 3.2 演算法核心 31 3.2.1 自動曝光 32 3.2.2 自動白平衡 36 第 四 章 數位影像穩定器 38 4.1 相關的研究 39 4.1.1 以適應性方法過濾巨集區塊移動向量的研究 39 4.1.2 以子影像相位關聯性估測整體移動向量的研究 42 4.2 演算法核心 44 4.2.1 影像整體移動估測 46 4.2.2 影像移動補償 53 第 五 章 動態影像壓縮 56 5.1 影像緩衝區的配置 57 5.2 二步搜尋法與影像移動估測 59 5.3 搜尋視窗載入影像記憶體的方式 60 第 六 章 實驗結果 62 6.1 動態影像壓縮效能評估 62 6.2 數位影像穩定器效能評估 64 第 七 章 結論與未來展望 81 7.1 結論 81 7.2 未來展望 81 參考文獻 82 附 錄 85 簡 歷 87 著 作 88

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