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ChatGPT and the Future of Work - Clark Boyd
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Getting into the tech field. what next
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Google's Just Not That Into You: Understanding Core Updates & Search Intent
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Time Management & Productivity - Best Practices
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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。
13.
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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