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博碩士論文 etd-0719107-170306 詳細資訊
Title page for etd-0719107-170306
論文名稱
Title
混合式浮水印技術應用於H.264/AVC錯誤偵測及隱匿
Error Detection and Correction for H.264/AVC Using Hybrid Watermarking
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
66
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2007-07-16
繳交日期
Date of Submission
2007-07-19
關鍵字
Keywords
錯誤偵測、錯誤隱匿、易碎式浮水印、強健式浮水印
error detection, error concealment, fragile watermark, robust watermark
統計
Statistics
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中文摘要
視訊通訊已廣泛應用於網際網路與無線傳輸,在有限頻寬環境中,視訊資料多先經壓縮處理,而壓縮後視訊資料已去除大部分冗餘,並經過熵編碼處理,此時若於傳輸頻道中發生錯誤,將可能造成顯像畫質嚴重劣化,而H.264/AVC為新一代視訊編解碼標準,其使用複雜模式判斷策略及速率-失真評估準則,以獲得高壓縮率及較佳雜訊比,惟壓縮效能之增進,亦導致接收視訊品質更容易受傳輸頻道錯誤所影響,而造成顯像畫質嚴重受損,因此於視訊接收端即時進行錯誤偵測、錯誤修正或隱匿為所欲研究課題。
本研究主要藉由同時使用易碎式浮水印技術及強健式浮水印技術,於編碼端將錯誤偵測及錯誤隱匿資訊嵌入新一代視訊編解碼標準H.264/AVC資料流中,俾利解碼端進行視訊錯誤偵測及隱匿處理,其錯誤偵測與定位乃透過易碎式浮水印技術,若偵測出錯誤區塊,則依此區塊編碼模式利用強健式浮水印技術擷取此區塊之低解析度影像或位移向量作為補償資訊,如此完成錯誤區塊隱匿,以提高解碼端解碼受雜訊干擾資料流之顯像畫質。
Abstract
none
目次 Table of Contents
摘要 I
目錄 II
圖目錄 IV
表目錄 V
第一章 簡介 1
1.1 動機 1
1.2 H.264/AVC視訊壓縮標準 2
1.2.1 空間域冗餘去除 2
1.2.2 時間軸冗餘去除 4
1.2.3 H.264/AVC視訊壓縮標準資料結構 4
1.3 視訊錯誤 6
1.4 視訊相關錯誤偵測方法 7
1.5 視訊相關錯誤類型 8
第二章 理論基礎 11
2.1研究背景 11
2.2傳統視訊錯誤偵測及隱匿處理 11
2.3數位浮水印技術 16
2.4 H.264/AVC編解碼技術 22
2.5 研究目的 29
第三章 研究方法與步驟 31
3.1 簡介 31
3.2 浮水印嵌入 31
3.3 浮水印擷取 33
3.4 浮水印實現 33
3.4.1 編碼端浮水印嵌入 33
3.4.2 圖框內編碼圖框強健式浮水印 35
3.4.3 圖框間編碼圖框強健式浮水印 38
3.4.4 圖框內編碼巨區塊易碎式浮水印 41
3.4.5 圖框間編碼巨區塊易碎式浮水印嵌入 42
3.4.6 解碼端浮水印擷取 42
3.5 解碼端錯誤偵測及隱匿 45
第四章 實驗結果與討論 47
4.1 效能評估指標 47
4.2 實作平台 48
4.3 測試影像序列 48
4.4 錯誤模擬 49
4.5 實驗結果 51
第五章 結論與未來方向 54
5.1 結論 54
5.2 未來方向 54
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