Kev Siv Tshuab Compression Video Zoo Tshaj Plaws rau CCTV Systems
Nyob rau lub caij niaj hnub no, kev ruaj ntseg yog ib qho tseem ceeb ntawm lub neej txhua hnub. Ib txoj hauv kev zoo tshaj plaws los tswj kev ruaj ntseg yog los ntawm kev siv Closed-Circuit Television (CCTV). Raws li thev naus laus zis nce qib, CCTV systems kuj tau dhau los ua qhov kev nce qib tseem ceeb, ib qho ntawm cov no yog video compression technology. Video compression yog cov txheej txheem ntawm kev txo qhov loj ntawm cov ntaub ntawv video yam tsis txo qhov zoo ntawm cov duab. Qhov no tso cai rau CCTV systems khaws cov yeeb yaj kiab ntau dua ntawm qhov chaw cia khoom tsawg thiab ua kom yooj yim rau kev xa video hla networks. Tsab xov xwm no yuav tshuaj xyuas qee qhov zoo tshaj plaws video compression technologies siv hauv CCTV systems, xws li H.264, H.265 (HEVC), thiab AV1.
H.264 (Kev Sau Npe Yees Duab Qib Siab)
H.264, tseem hu ua Advanced Video Coding (AVC), yog ib qho ntawm cov qauv video compression nrov tshaj plaws thiab siv dav hauv kev lag luam CCTV. ITU-T Video Coding Experts Group (VCEG) thiab ISO/IEC Moving Picture Experts Group (MPEG) tau qhia, H.264 muab qhov sib npaug zoo tshaj plaws ntawm qhov zoo ntawm video thiab kev ua haujlwm compression zoo.
Cov txiaj ntsig ntawm H.264
1. Kev Zoo ntawm Video: H.264 muaj peev xwm tsim cov video zoo heev ntawm cov bitrates qis dua li cov qauv compression yav dhau los xws li MPEG-2 lossis MJPEG.
2. Kev Ua Haujlwm Zoo ntawm Kev Khaws Cia: Los ntawm kev siv cov txheej txheem compression siab heev xws li kev kwv yees qhov chaw thiab lub sijhawm, H.264 tuaj yeem txo qhov loj ntawm cov ntaub ntawv video yam tsis muaj kev cuam tshuam cov duab zoo. Qhov no tseem ceeb heev rau cov kab ke CCTV uas xav tau kev khaws cia ntev.
3. Muaj Ntau Yam: Tau muaj ntau tshaj kaum xyoo lawm, H.264 tau txais kev txhawb nqa los ntawm yuav luag txhua yam khoom siv thiab software uas muaj tam sim no. Qhov no ua rau nws sib xws nrog ntau yam CCTV systems.
4. Kev Txuag Bandwidth: H.264 compression technology pab txo qhov yuav tsum tau bandwidth rau kev xa video, yog li ua rau muaj kev xa video zoo dua ntawm cov tes hauj lwm qeeb lossis tsis ruaj khov.
H.264 Qhov Tsis Zoo
1. Kev Nyuaj ntawm Kev Sau Npe: Cov txheej txheem sau npe H.264 nyuaj dua thiab xav tau lub zog suav ntau dua li cov thev naus laus zis compression qub.
2. Daim Ntawv Tso Cai: Txawm hais tias siv tau zoo heev los xij, kev siv H.264 xav tau daim ntawv tso cai uas yuav ua rau cov nqi ua haujlwm nce ntxiv rau qee lub koom haum.
H.265 (Kev Siv Video Zoo Tshaj Plaws)
H.265, lossis High Efficiency Video Coding (HEVC), yog tus hloov H.264. HEVC tau tsim los daws cov teeb meem ntawm H.264, thiab muab kev nias zoo dua, ua rau cov yeeb yaj kiab zoo nrog cov ntaub ntawv me dua.
Cov txiaj ntsig ntawm H.265
1. Kev Ua Haujlwm Zoo Tshaj Plaws: H.265 tuaj yeem txo qhov loj ntawm cov ntaub ntawv video txog li 50% piv rau H.264 thaum tseem khaws cov yeeb yaj kiab zoo ib yam. Qhov no muaj txiaj ntsig zoo rau kev txuag qhov chaw cia khoom thiab bandwidth network.
2. Kev Zoo Tshaj Plaws ntawm Cov Yeeb Yaj Kiab: Los ntawm kev siv cov txheej txheem compression siab heev xws li quad-tree partitioning, HEVC muaj peev xwm khaws cov ntsiab lus zoo dua ntawm cov duab tshwj xeeb tshaj yog ntawm cov kev daws teeb meem siab xws li 4K thiab 8K.
3. Kev Hloov Tau: HEVC txhawb nqa ntau yam kev daws teeb meem video, los ntawm cov xov tooj ntawm tes mus rau cov ntxaij vab tshaus loj, ua rau nws hloov tau raws li ntau yam kev xav tau.
H.265 Qhov Tsis Zoo
1. Tshuab Tshiab: Txawm hais tias ua haujlwm tau zoo dua, HEVC tseem tshiab heev yog li kev sib raug zoo nrog cov khoom siv kho vajtse thiab software qub yuav yog qhov teeb meem.
2. Hluav Taws Xob thiab Lub Hwj Chim Xam: Cov txheej txheem encoding H.265 nyuaj dua thiab xav tau ntau lub zog xam thiab hluav taws xob, uas tuaj yeem ua rau CCTV systems uas yuav tsum ua haujlwm 24/7 tsis ua haujlwm.
3. Cov Nqi Rau Daim Ntawv Tso Cai: Ib yam li H.264, HEVC kuj xav tau cov nqi rau daim ntawv tso cai uas yuav ua rau cov koom haum me lossis nruab nrab tsis kam txais yuav dav dav.
AV1 (AOMedia Video 1)
AV1 yog ib lub tshuab siv los nias cov yeeb yaj kiab uas tsim los ntawm Alliance for Open Media (AOMedia). Ua ib qho qauv nias uas qhib thiab tsis muaj nqi them, AV1 yog tsim los kom muaj kev nias zoo dua li H.265, thaum tsis tas them nqi rau daim ntawv tso cai.
Cov txiaj ntsig ntawm AV1
1. Kev Ua Haujlwm Zoo Tshaj Plaws: Raws li qee qhov kev tshawb fawb, AV1 tuaj yeem ua kom cov yeeb yaj kiab compress tau zoo dua li H.265 txog li 30%, uas txhais tau tias yuav txuag tau ntau qhov chaw cia khoom.
2. Tsis Muaj Nqis: Ib qho ntawm qhov zoo ntawm AV1 yog tias nws tsis muaj nqis. Qhov no txo cov nqi tso cai, uas tuaj yeem pab tau ntau lub tuam txhab.
3. Zoo Tshaj Plaws Video: AV1 siv ntau yam kev siv compression uas muaj peev xwm tswj tau qhov zoo ntawm video txawm tias ntawm bitrates qis.
4. Kev Txhawb Nqa Kev Lag Luam: AV1 tau txais kev txhawb nqa los ntawm cov tuam txhab loj xws li Google, Netflix, thiab Microsoft, ua rau nws yog tus qauv ntseeg siab thiab tau txais kev lees paub sai hauv kev lag luam.
Qhov Tsis Zoo ntawm AV1
1. Qhov nyuaj ntawm kev encoding thiab decoding: AV1 thev naus laus zis xav tau lub zog suav ntau dua li H.264 thiab H.265. Qhov no tuaj yeem cuam tshuam rau kev ua haujlwm thiab kev siv hluav taws xob ntawm CCTV kho vajtse.
2. Tsis Muaj Kev Txhawb Nqa Kho Vajtse: Txawm hais tias ntau lub tuam txhab loj txhawb nqa AV1, kev txhawb nqa kho vajtse rau AV1 decoding tseem nyob rau hauv nws qhov ntxov ntxov thiab tsis muaj kev nkag siab zoo li H.264 thiab H.265.
Xaus
Kev siv tshuab compression video ua lub luag haujlwm tseem ceeb hauv cov tshuab CCTV niaj hnub no. H.264, txawm tias qub dua, tseem muaj txiaj ntsig zoo thiab ua haujlwm tau zoo rau feem ntau ntawm cov ntawv thov. H.265 coj kev ua haujlwm compression mus rau qib tshiab, tab sis nrog kev nyuaj ntxiv thiab cov nqi tso cai. AV1, tus neeg ua si tshiab dua, muab kev ua haujlwm compression zoo dua thiab tsis muaj nqi royalty, txawm hais tias kev txhawb nqa kho vajtse tseem tab tom txhim kho.
Thaum xaiv cov thev naus laus zis zoo tshaj plaws rau koj lub CCTV system, nws yog ib qho tseem ceeb uas yuav tsum xav txog cov kev cai tshwj xeeb xws li qhov chaw cia khoom, qhov zoo ntawm cov yeeb yaj kiab, kev sib xws ntawm cov khoom siv, thiab tus nqi. Los ntawm kev nkag siab txog qhov zoo thiab qhov tsis zoo ntawm txhua yam thev naus laus zis, koj tuaj yeem txiav txim siab zoo tshaj plaws los txhim kho kev ruaj ntseg thiab kev ua haujlwm ntawm koj lub CCTV system.
