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Ryo Amano
Ryo Amano

2009.5.29 ӻg㏊ESM ʯη֤YϤ_

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RΤ
VLD ӻ IDCT Ӥa ? JPEGƤƤ ? (ע)ʤ꺆ԤƤޤ
? ե`gDz֤ȡ ? rgĤ혷Ǥʤ淽򡢁I⤢ 롣ҰYϲ ? ե`gDŽӤʳ ? Ӥ٥ȥΗ(졢_)| Ӱ푤뤨 ? ե`gǰk ? ӥåȥ`(CBR/VBR)
DCT ӻ VLC Ӥa IDCT ӻ ? ä}j ? Ǥ⤫ʤ꺆ԻƤޤ ? |ؤΥѥȤ벿֤
DCT ӻ VLC Ӥa IDCT ӻ
DCT ӻ VLC Ӥa IDCT ӻ 352 156 -55 42 7 -5 0 0 35 15 -5 40 0 0 0 0 134 -75 39 -10 4 -1 -3 0 13 -7 3 -1 0 0 0 0 80 -31 11 4 2 0 0 0 8 -3 1 0 0 0 0 0 28 15 -2 1 2 1 0 0 2 1 0 0 0 0 0 0 17 2 -1 1 -1 0 0 0 1 0 0 0 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 1 -1 0 0 0 0 0 10dz 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
3,087 Bytes 166,063 Bytes RsʤߤӻФꤹ ʤߤBitmap(24bit) 298,116 Bytes
? ե`ڷ굱 ? עҕ֤˶यΥǩ`굱Ƥ ? 벿 ? äƄӤ ? ե`g굱 ? ԥ㥿פȤ˸굱Ƥǩ`{ ? `ե`϶ ? VBR{ηڤ ? ˲gĤʤ˸굱Ƥ뤳Ȥ
? MPEG2 4Mbps CBR ? MPEG2 2Mbps CBR ? MPEG2 2Mbps VBR ? MPEG4AVC 2Mbps VBR
MPEG2 2Mbps CBR
MPEG2 2Mbps VBR
MPEG4AVC 2Mbps VBR
MPEG2 4Mbps CBR
2MbpsCBR 2MbpsVBR 4MbpsCBR
VBRӻϡ2ѥɤƤޤ 2ѥäƣ 1ѥĿǁŻIФ ? ڤΰkֲ ? `󤴤Ȥΰkֲ 2ѥĿnjgHηŻIФ ? 1ѥĿǵä줿ֲ˻Ť
? MPEG2߻|ɤϡ ? ɉ֥å ? `٤ʤ⤬ ? ܲQ ? Enc/Decg`ʤʤ ? եե`xk ? y`٤ʤե`बxkǤ ? 1/4y ? ȥy ? `ե`ե`yФkp ? gŻ ? ϥեޥŻतŻʤ ? ǥ֥å󥰥ե륿 ? ֥åξƽΥƤ
ݤˤʤ MPEG2 2Mbps CBR
? ͬRsʽʤӥåȥ`Ȥǻ|Qޤ ? MPEG2 2Mbps CBR < MPEG2 4Mbps CBR ? θ굱Ƥm뤳Ȥǻ| Ϥ ? MPEG2 2Mbps CBR < MPEG2 2Mbps VBR ? MPEG4AVCBlu-rayݤ핤ޤǑ館 ? MPEG2 4Mbps CBR P MPEG4AVC 2Mbps VBR ? Ĥޤ
ȫƤǤϤʤ
RΤ
MPEG2 2Mbps CBR MPEG2 2Mbps VBR MPEG4AVC 2Mbps VBR MPEG2 4Mbps CBR
bitrate MPEG2 MPEG4 H.261 MPEG1 H.263 1990 1992 1994 1996 1999
? H.261 ? ISDNTVԒ ? ᥤ󥿩`åȤQCIF(17614464kbps ? H.263 ? H.261ŻʤϤ ? 뻭yPBե`ࡢԪVLC ? H.263 Ver.2 ? H.263ΒҎ
? MPEG(Moving Picture Experts Group)1 ? eýӛh; ? ᥤ󥿩`åȤSIF(3522401.5Mbps ? H.261ŻʡॢԤ ? Bԥ㡢GOP졢뻭y ? MPEG2 ? 󥿩`쥹ʵĤ˷Ż ? ե`ɘ졢ե`y ? ץեȥ٥ˤ}Υ֥åȤ ? MP@ML(DVD:720x480) ? MP@HL(BS Digital:1920x1080)
? MPEG4 ? ͥӥåȥ`Ȥ饹٥ޤǤ򥫥Щ` ? H.263Υ٩`饤Ҏ ? ץեȥ٥ˤ}Υ֥åȤ ? H.263˷Żʡ`Ԥ ? ֥ȷŻR-VLC
`󥹲 GOP GOP GOP GOP GOP GOP I P B B P B B 饤 Y Y Cr Cb ޥ֥å Y Y

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RΤ

  • 2. VLD ӻ IDCT Ӥa ? JPEGƤƤ ? (ע)ʤ꺆ԤƤޤ
  • 3. ? ե`gDz֤ȡ ? rgĤ혷Ǥʤ淽򡢁I⤢ 롣ҰYϲ ? ե`gDŽӤʳ ? Ӥ٥ȥΗ(졢_)| Ӱ푤뤨 ? ե`gǰk ? ӥåȥ`(CBR/VBR)
  • 4. DCT ӻ VLC Ӥa IDCT ӻ ? ä}j ? Ǥ⤫ʤ꺆ԻƤޤ ? |ؤΥѥȤ벿֤
  • 5. DCT ӻ VLC Ӥa IDCT ӻ
  • 6. DCT ӻ VLC Ӥa IDCT ӻ 352 156 -55 42 7 -5 0 0 35 15 -5 40 0 0 0 0 134 -75 39 -10 4 -1 -3 0 13 -7 3 -1 0 0 0 0 80 -31 11 4 2 0 0 0 8 -3 1 0 0 0 0 0 28 15 -2 1 2 1 0 0 2 1 0 0 0 0 0 0 17 2 -1 1 -1 0 0 0 1 0 0 0 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 1 -1 0 0 0 0 0 10dz 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  • 7. 3,087 Bytes 166,063 Bytes RsʤߤӻФꤹ ʤߤBitmap(24bit) 298,116 Bytes
  • 8. ? ե`ڷ굱 ? עҕ֤˶यΥǩ`굱Ƥ ? 벿 ? äƄӤ ? ե`g굱 ? ԥ㥿פȤ˸굱Ƥǩ`{ ? `ե`϶ ? VBR{ηڤ ? ˲gĤʤ˸굱Ƥ뤳Ȥ
  • 9. ? MPEG2 4Mbps CBR ? MPEG2 2Mbps CBR ? MPEG2 2Mbps VBR ? MPEG4AVC 2Mbps VBR
  • 14. 2MbpsCBR 2MbpsVBR 4MbpsCBR
  • 15. VBRӻϡ2ѥɤƤޤ 2ѥäƣ 1ѥĿǁŻIФ ? ڤΰkֲ ? `󤴤Ȥΰkֲ 2ѥĿnjgHηŻIФ ? 1ѥĿǵä줿ֲ˻Ť
  • 16. ? MPEG2߻|ɤϡ ? ɉ֥å ? `٤ʤ⤬ ? ܲQ ? Enc/Decg`ʤʤ ? եե`xk ? y`٤ʤե`बxkǤ ? 1/4y ? ȥy ? `ե`ե`yФkp ? gŻ ? ϥեޥŻतŻʤ ? ǥ֥å󥰥ե륿 ? ֥åξƽΥƤ
  • 18. ? ͬRsʽʤӥåȥ`Ȥǻ|Qޤ ? MPEG2 2Mbps CBR < MPEG2 4Mbps CBR ? θ굱Ƥm뤳Ȥǻ| Ϥ ? MPEG2 2Mbps CBR < MPEG2 2Mbps VBR ? MPEG4AVCBlu-rayݤ핤ޤǑ館 ? MPEG2 4Mbps CBR P MPEG4AVC 2Mbps VBR ? Ĥޤ
  • 21. MPEG2 2Mbps CBR MPEG2 2Mbps VBR MPEG4AVC 2Mbps VBR MPEG2 4Mbps CBR
  • 22. bitrate MPEG2 MPEG4 H.261 MPEG1 H.263 1990 1992 1994 1996 1999
  • 23. ? H.261 ? ISDNTVԒ ? ᥤ󥿩`åȤQCIF(17614464kbps ? H.263 ? H.261ŻʤϤ ? 뻭yPBե`ࡢԪVLC ? H.263 Ver.2 ? H.263ΒҎ
  • 24. ? MPEG(Moving Picture Experts Group)1 ? eýӛh; ? ᥤ󥿩`åȤSIF(3522401.5Mbps ? H.261ŻʡॢԤ ? Bԥ㡢GOP졢뻭y ? MPEG2 ? 󥿩`쥹ʵĤ˷Ż ? ե`ɘ졢ե`y ? ץեȥ٥ˤ}Υ֥åȤ ? MP@ML(DVD:720x480) ? MP@HL(BS Digital:1920x1080)
  • 25. ? MPEG4 ? ͥӥåȥ`Ȥ饹٥ޤǤ򥫥Щ` ? H.263Υ٩`饤Ҏ ? ץեȥ٥ˤ}Υ֥åȤ ? H.263˷Żʡ`Ԥ ? ֥ȷŻR-VLC
  • 26. `󥹲 GOP GOP GOP GOP GOP GOP I P B B P B B 饤 Y Y Cr Cb ޥ֥å Y Y