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研究生:黃清標
論文名稱:於消除小波影像漣波效應之適應性雙向型態濾波器設計
論文名稱(外文):The design of ring artifact removal wavelet coded image using adaptive bilateral morphological filter
指導教授:王春清
學位類別:碩士
校院名稱:國立彰化師範大學
系所名稱:電機工程學系
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:2007
畢業學年度:95
語文別:中文
論文頁數:71
中文關鍵詞:形態濾波器雙向濾波器邊緣偵測人工漣波JPEG2000
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JPEG2000是新的影像壓縮標準,由國際標準組織所提出。由於JPEG2000的主要核心技術是採用離散小波轉換(Discrete Wavelet Transform, DWT),所以其可以壓縮影像在非常低的位元率之下,而保有較好之影像品質。然而當影像採用JPEG2000壓縮在低位元率時,由於過度的量化與反量化失真,重建的影像會包含明顯的人工漣波(Ringing Artifacts)影像,且在邊緣區域會較明顯存在。為了移除人工漣波影像,本文提出一個新型的濾波器演算法,濾波器包含雙向濾波器(Bilateral Filter)和型態學運算(Morphological Operation)兩大主要濾波方法。架構上大致可分成前後部份,前部分由雙向濾波器組成,主要是針對非邊緣區域之小漣波進行移除,後部份是由形態學運算組成,主要是利用形態學運算來消除邊緣附近較明顯之漣波。實驗結果之評估包含了PSNR、VRM(Visible Ringing Measure)與主觀測試(Object Test),實驗結果顯示本文之濾波器演算法在PSNR約可提升0.1dB而VRM約可降低4%與視覺感受上有不錯之提升。
第一章 緒論…………………………………………………………………… 1
1.1 研究背景與動機…………………………………………………… 1
1.2 JPEG2000……………………………………………………………1
1.3 相關文獻………………………………………………………… 8
1.4 文章結構………………………………………………………… 11
第二章 漣波濾波器演算法………………………………………………… 12
2.1 適應性雙向濾波器設計………………………………………… 13
2.1.1 標準差………………………………………………… 13
2.1.2 雙向濾波器…………………………………………… 14
2.2 型態濾波器設計………………………………………………… 20
2.2.1 邊緣偵測……………………………………………… 20
2.2.2 型態學運算…………………………………………… 24
第三章 模擬結果………………………………………………………………37
3.1 BIMO演算法效能評估……………………………………………… 39
3.1.1 適應性參數實驗結果………………………………… 40
3.1.2非適應性參數效能………………………………………56
3.2 僅用雙向濾波器結果.…………………………………………… 61
3.3 僅用型態處理結果……………………………………………………63
3.4 濾除區塊效應結果………………………………………………… 64
第四章 結論…………………………………………………………………66
參考文獻…………………………………………………………………………67
論文發表…………………………………………………………………………71
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