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組員 :0992963 曾美瑜 0993010 邱國華 0993014 吳玉
冰
MPEG 的基本壓縮 -1
 視訊資料裡面有很多張影像,每張影像都
要從 RGB 的色彩模型轉換成 YCrCb ,
首先將影像區分成較小的 8x8 區塊,接
著對每個區塊內的所有畫素進行離散餘弦
轉換
DCT ,將原本畫素的色彩 依照其分部值
的情形轉化成 DCT 係數,其中,又藉由
量子化的方式將人類視覺上較不敏感的色
彩變化加以濾除,接著以 Zig-Zag 的方是
將原先的二維資料轉換成一維的序列加以
編碼儲存。
MPEG 基本壓縮 -2
 動態補償即是在兩張 I 畫格中,會依照比
例在相關的位置制入一定數量的 P 畫格
( 利用前一個 I 畫格再加上位一向量來加
以預測 P 畫格的內容 ) 以及 B 畫格 ( 利用
前後的 I 畫格以及 P 畫格,以內插法產生
B 畫格的內容 ) 。
MPEG1
 1992 年制定,主要用於 CD-ROM 上
 位元率 : 大約 1.5M bps
 畫面解析度 : 352X240(NTSC 系統 )
 352X240 (PAL 系統 )
 播放速度 : 30FPS(NTSC 系統 )
 25FPS (PAL 系統 )
MPEG-1
 在影像壓縮部分, MPEG-1 色差比例為
4:2:0 這是利用人類的感官知覺對亮度
(Y) 的敏感度較高,也依此他只保留亮度
的完整資訊,而以較少的資訊來儲存其他
兩種色彩的色差,才可產生較大的壓縮比
率。
 在畫格與畫格間則是採用動態補償。
MPEG-2
 1994 年制定
 主要用於 DVD 、廣播、有線網路電視、網路
視訊等等
 位元率 : 大約 1.5M bps
 畫面解析度 :720X480(NTSC 系統 )
 720X576 (PAL 系統 )
 播放速度 :30FPS(NTSC 系統 )
 25FPS (PAL 系統 )
MPEG-2
 色差比例 : 4:4:2 和 4:4:4
 在畫面掃描方式也增加了交錯式的掃描方式
 影像序列的壓縮及表示方式 : 動態補償法
MPEG-4
 1998 年發表
 主要針對各種速率視訊及音訊作編碼
 導入物件的觀念,名為 AV Object
 AV Object 建立的 MPEG-4 場景有五個
特性
 一、可以使用 AV Object 來表示視覺、聽
覺、或其他組合內容
 二、可以使用原有的 AV Object 來組合
AV Object ,產生新的場景
MPEG-4
 三、 AV Object 提供較靈活的壓縮及運
輸,並選擇適合的網路頻寬
 四、允許使用者在場景中與 AV Object 進
行互動
 五、 MPEG-4 的 AV Object 支援智慧財
產權的保護
 特點 : 更適合 AV 服務和遠端監控
MPEG-7
 1996 年開始研發
 目的:制定多媒體內容的標準
 可應用於存儲 ( 線上或離線 ) 、串流、數
位圖書館、多媒體編輯
MPEG-7
 在 MPEG-7 中,每一分多媒體資料的描
述都是利用描述元 ( 描述多媒體資料的內
容 ) 以及描述結構 ( 用結構化的方式來說
明多媒體資料 ) 組成。
MPEG-21
 MPEG-21 主要是整合多媒體智慧財產權
的技術,例如:內容的描述、建立、發表
、使用、收費、智慧財產權…等

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Mpeg

  • 1. 組員 :0992963 曾美瑜 0993010 邱國華 0993014 吳玉 冰
  • 2. MPEG 的基本壓縮 -1  視訊資料裡面有很多張影像,每張影像都 要從 RGB 的色彩模型轉換成 YCrCb , 首先將影像區分成較小的 8x8 區塊,接 著對每個區塊內的所有畫素進行離散餘弦 轉換 DCT ,將原本畫素的色彩 依照其分部值 的情形轉化成 DCT 係數,其中,又藉由 量子化的方式將人類視覺上較不敏感的色 彩變化加以濾除,接著以 Zig-Zag 的方是 將原先的二維資料轉換成一維的序列加以 編碼儲存。
  • 3. MPEG 基本壓縮 -2  動態補償即是在兩張 I 畫格中,會依照比 例在相關的位置制入一定數量的 P 畫格 ( 利用前一個 I 畫格再加上位一向量來加 以預測 P 畫格的內容 ) 以及 B 畫格 ( 利用 前後的 I 畫格以及 P 畫格,以內插法產生 B 畫格的內容 ) 。
  • 4. MPEG1  1992 年制定,主要用於 CD-ROM 上  位元率 : 大約 1.5M bps  畫面解析度 : 352X240(NTSC 系統 )  352X240 (PAL 系統 )  播放速度 : 30FPS(NTSC 系統 )  25FPS (PAL 系統 )
  • 5. MPEG-1  在影像壓縮部分, MPEG-1 色差比例為 4:2:0 這是利用人類的感官知覺對亮度 (Y) 的敏感度較高,也依此他只保留亮度 的完整資訊,而以較少的資訊來儲存其他 兩種色彩的色差,才可產生較大的壓縮比 率。  在畫格與畫格間則是採用動態補償。
  • 6. MPEG-2  1994 年制定  主要用於 DVD 、廣播、有線網路電視、網路 視訊等等  位元率 : 大約 1.5M bps  畫面解析度 :720X480(NTSC 系統 )  720X576 (PAL 系統 )  播放速度 :30FPS(NTSC 系統 )  25FPS (PAL 系統 )
  • 7. MPEG-2  色差比例 : 4:4:2 和 4:4:4  在畫面掃描方式也增加了交錯式的掃描方式  影像序列的壓縮及表示方式 : 動態補償法
  • 8. MPEG-4  1998 年發表  主要針對各種速率視訊及音訊作編碼  導入物件的觀念,名為 AV Object  AV Object 建立的 MPEG-4 場景有五個 特性  一、可以使用 AV Object 來表示視覺、聽 覺、或其他組合內容  二、可以使用原有的 AV Object 來組合 AV Object ,產生新的場景
  • 9. MPEG-4  三、 AV Object 提供較靈活的壓縮及運 輸,並選擇適合的網路頻寬  四、允許使用者在場景中與 AV Object 進 行互動  五、 MPEG-4 的 AV Object 支援智慧財 產權的保護  特點 : 更適合 AV 服務和遠端監控
  • 10.
  • 11. MPEG-7  1996 年開始研發  目的:制定多媒體內容的標準  可應用於存儲 ( 線上或離線 ) 、串流、數 位圖書館、多媒體編輯
  • 12. MPEG-7  在 MPEG-7 中,每一分多媒體資料的描 述都是利用描述元 ( 描述多媒體資料的內 容 ) 以及描述結構 ( 用結構化的方式來說 明多媒體資料 ) 組成。