1
绗?/p>
1
绔?/p>
澶氬獟浣撴妧鏈瑕?/p>
1.1
澶氬獟浣撴槸浠�涔堬紵
澶氬獟浣撴槸铻嶅悎涓ょ鎴栬�呬袱绉嶄互涓婂獟浣撶殑涓�绉嶄汉
-
鏈轰氦浜掑紡淇℃伅浜ゆ祦鍜屼紶鎾獟浣撱�備娇鐢ㄧ殑
濯掍綋鍖呮嫭鏂囧瓧銆佸浘褰€�佸浘鍍忋�佸０闊炽�佸姩鐢诲拰瑙嗗儚
(video)
銆?/p>
1.4
鏃犳崯鍘嬬缉鏄粈涔堬紵
鏃犳崯鍘嬬缉鏄敤鍘嬬缉鍚庣殑鏁版嵁杩涜閲嶆瀯
(
涔熺О杩樺師鎴栬В鍘嬬缉
)
锛?/p>
閲嶆瀯鍚庣殑鏁版嵁涓庡師鏉ョ殑鏁版嵁
瀹屽叏鐩稿悓鐨勬暟鎹帇缂╂妧鏈�?/p>
鏃犳崯鍘嬬缉鐢ㄤ簬瑕佹眰閲嶆瀯鐨勬暟鎹笌鍘熷鏁版嵁瀹屽叏涓�鑷寸殑搴旂敤锛?/p>
濡傜鐩樻枃浠跺帇缂╁氨鏄竴涓簲
鐢ㄥ疄渚嬨�傛牴鎹綋鍓嶇殑鎶�鏈按骞筹紝鏃犳崯鍘嬬缉绠楁硶鍙妸鏅�氭枃浠剁殑鏁版嵁鍘嬬缉鍒板師鏉ョ殑
1/2
锝?/p>
1/4
銆?/p>
甯哥敤鐨勬棤鎹熷帇缂╃畻娉曞寘鎷搱澶浖缂栫爜鍜?/p>
LZW
绛夌畻娉曘�?/p>
1.5
鏈夋崯鍘嬬缉鏄粈涔堬紵
鏈夋崯鍘嬬缉鏄敤鍘嬬缉鍚庣殑鏁版嵁杩涜閲嶆瀯锛?/p>
閲嶆瀯鍚庣殑鏁版嵁涓庡師鏉ョ殑鏁版嵁鏈夋墍涓嶅悓锛?/p>
浣嗕笉褰卞搷
浜哄鍘熷璧勬枡琛ㄨ揪鐨勪俊鎭�犳垚璇В鐨勬暟鎹帇缂╂妧鏈�?/p>
鏈夋崯鍘嬬缉閫傜敤浜庨噸鏋勬暟鎹笉涓�瀹氶潪瑕佸拰鍘熷鏁版嵁瀹屽叏鐩稿悓鐨勫簲鐢ㄣ�?/p>
渚嬪锛?/p>
鍥惧儚銆?/p>
瑙嗗儚鍜?/p>
澹伴煶鏁版嵁灏卞彲閲囩敤鏈夋崯鍘嬬缉锛?/p>
鍥犱负瀹冧滑鍖呭惈鐨勬暟鎹線寰�澶氫簬鎴戜滑鐨勮瑙夌郴缁熷拰鍚绯荤粺鎵�鑳?/p>
鎰熷彈鐨勪俊鎭紝涓㈡帀涓�浜涙暟鎹�屼笉鑷充簬瀵瑰浘鍍忋�佽鍍忔垨澹伴煶鎵�琛ㄨ揪鐨勬剰鎬濅骇鐢熻瑙ｃ�?/p>
1.9 H.261~H.264
鍜?/p>
G.711~G.731
鏄摢涓粍缁囧埗瀹氱殑鏍囧噯锛?/p>
鍥介檯鐢典俊鑱旂洘
(ITU)
銆?/p>
1.10 MPEG-1
锛?/p>
MPEG-2
鍜?/p>
MPEG-4
鏄摢涓粍缁囧埗瀹氱殑鏍囧噯锛?/p>
ISO/IEC
锛屽嵆鍥介檯鏍囧噯鍖栫粍缁?/p>
(ISO)/
鍥介檯鐢靛伐鎶�鏈鍛樹細
(IEC)
銆?/p>
绗?/p>
2
绔?/p>
鏃犳崯鏁版嵁鍘嬬缉
2.1
鍋囪
{
,
,
}
a
b
c
鏄敱
3
涓簨浠剁粍鎴愮殑闆嗗悎锛岃绠楄闆嗗悎鐨勫喅绛栭噺銆?/p>
(
鍒嗗埆鐢?/p>
Sh
锛?/p>
Nat
鍜?/p>
Hart
浣滃崟浣?/p>
)
銆?/p>
H
0
=
(log
2
3) Sh
=
1.580 Sh
=
(log
e
3) Nat
=
1.098 Nat
=
(log
10
3) Hart
=
0.477 Hart
2.2
鐜版湁涓�骞呯敤
256
绾х伆搴﹁〃绀虹殑鍥惧儚锛屽鏋滄瘡绾х伆搴﹀嚭鐜扮殑姒傜巼鍧囦负
(
)
1/
256
i
p
x
飥?/p>
锛?
0,
,255
i
飥?/p>
锛岃绠楄繖骞呭浘鍍忔暟鎹殑鐔点�?/p>
2
2
1
1
1
(
)
(
)log
(
)
256
(
log
)
256
256
n
i
i
i
H
X
p
x
p
x
飥?/p>
飥?/p>
飥?/p>
飥?/p>
飥?/p>
飩?/p>
飩?/p>
飪?/p>
=8 (
浣?/p>
)
锛?/p>
涔熷氨鏄瘡绾х伆搴︾殑浠ｇ爜灏辫鐢?/p>
8
姣旂壒锛屼笉鑳藉啀灏戜簡銆?/p>