JPEG JPEG Joint Photographic Experts Group ISOCCITT 1986

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JPEG的介紹 • 歷史 – JPEG (Joint Photographic Experts Group) – ISO與CCITT (1986) – 首次發表稱為ISO/IEC

JPEG的介紹 • 歷史 – JPEG (Joint Photographic Experts Group) – ISO與CCITT (1986) – 首次發表稱為ISO/IEC 10918 -1 (1991) – 國際標準 (1992 – ) 3

JPEG的介紹 (cont. ) • 考慮一張 640 480 的全彩影像 – 640 480 3 8= 7372800

JPEG的介紹 (cont. ) • 考慮一張 640 480 的全彩影像 – 640 480 3 8= 7372800 Bits – Modem 36 Kbps • 7372800/36000= 204. 8 (sec)= 3. 41 (min) – 假設JPEG之壓縮率為 12 • (7372800/12)/36000= 17. 1 (sec) • 時間 versus 金錢 4

色相轉換 (cont. ) RGB模式轉換亮度、彩度模式之公式 Y = 0. 299 R +0. 587 G +0. 114

色相轉換 (cont. ) RGB模式轉換亮度、彩度模式之公式 Y = 0. 299 R +0. 587 G +0. 114 B Cb = -0. 168 R-0. 331 G -0. 499 B Cr = 0. 500 R -0. 419 G -0. 081 B Y: 亮度 Cb 與 Cr: 彩度 12

熵編碼 (cont. ) ZIG-ZAG Scan圖例 27

熵編碼 (cont. ) ZIG-ZAG Scan圖例 27

熵編碼 (cont. ) AC Huffman Coding示意圖 29

熵編碼 (cont. ) AC Huffman Coding示意圖 29

JPEG JPEG is Joint Photographic Experts Group compressesJPEG JPEG is Joint Photographic Experts Group compresses
JPEG Introduction n JPEG Joint Photographic Experts GroupJPEG Introduction n JPEG Joint Photographic Experts Group
JPEG JPEG 2000 JPEG Isabelle Marque JPEG 2000JPEG JPEG 2000 JPEG Isabelle Marque JPEG 2000
COMPRESSION JPEG Joint Photographic Expert Group 1 INTRODUCTIONCOMPRESSION JPEG Joint Photographic Expert Group 1 INTRODUCTION
JPEG The JPEG Standard JPEG is an imageJPEG The JPEG Standard JPEG is an image
CSE 679 JPEG r JPEG goals r JPEGCSE 679 JPEG r JPEG goals r JPEG
GIF Graphic interchange format n JPEG Joint photographicGIF Graphic interchange format n JPEG Joint photographic
Advanced JPEG Dinesh Ganotra Organizations Involved Joint PhotographicAdvanced JPEG Dinesh Ganotra Organizations Involved Joint Photographic
The Photographic Message Roland Barthes The photographic paradoxThe Photographic Message Roland Barthes The photographic paradox
1986 OR NPE 1986 by YOGITA NEED ENABLE1986 OR NPE 1986 by YOGITA NEED ENABLE
Life beyond Science Early Work 1986 1986 EarlyLife beyond Science Early Work 1986 1986 Early
1984 Geraghty 1986 Mollman 1986 Shapiro 1987 Young1984 Geraghty 1986 Mollman 1986 Shapiro 1987 Young
1981 1986 1981 1982 1983 1984 1981 19861981 1986 1981 1982 1983 1984 1981 1986
Rubin Causal Model Holland 1986 Holland PW 1986Rubin Causal Model Holland 1986 Holland PW 1986
What is JPEG 2000 JPEG 2000 is aWhat is JPEG 2000 JPEG 2000 is a
JPEG Still Image Data Compression Standard JPEG IntroductionJPEG Still Image Data Compression Standard JPEG Introduction
13 2 ISOIEC 10918 1 JPEG BASELINE JPEG13 2 ISOIEC 10918 1 JPEG BASELINE JPEG
CIS 679 JPEG more r Review of JPEGCIS 679 JPEG more r Review of JPEG
JPEG Tutorial JPEG is the image compression standardJPEG Tutorial JPEG is the image compression standard
JPEG Compression What is JPEG n n nJPEG Compression What is JPEG n n n
Still Image Conpression JPEG JPEG 2000 YuWei ChangStill Image Conpression JPEG JPEG 2000 YuWei Chang
CIS 679 JPEG more r Review of JPEGCIS 679 JPEG more r Review of JPEG
JPEG MPEG Yan Felix Monangin 0810633089 JPEG adalahJPEG MPEG Yan Felix Monangin 0810633089 JPEG adalah
GESAMP The Joint Group of Experts on theGESAMP The Joint Group of Experts on the