Zauv Scan - Lub hauv paus ntawm kev ua video
Nrog nws cov kev taw qhia nyob rau hauv nruab nrab-xyoo 1990, DVD ua qhov tseem ceeb ntawm cov kev ua yeeb yam hauv tsev. Nrog nws cov duab vastly zoo dua VHS thiab analog TV, DVD cim ua ntej loj loj hauv tsev lom ze. Ib feem ntawm lub ntsiab tseem ceeb ntawm DVD yog kev ua hauj lwm ntawm cov qauv luam tawm cov txheej txheem los txhim kho TV saib zoo.
Interlaced Scan - Lub Hauv Pem Hauv Zaj Yeem Tso Tseg
Ua ntej peb tuaj yeem ua dab tsi ua kom tiav qhov twg thiab nws qhov tseem ceeb hauv kev txhim kho TV saib, nws yog ib qho tseem ceeb uas yuav tsum to taub txog txoj kev ua yeeb yaj kiab analog video tau tso tawm rau hauv TV. Cov xov tooj cua Analog , xws li cov chaw nres tsheb hauv zos, lub tuam txhab cable, los yog VCR tau muab tso rau hauv TV ntsuas uas siv lub tshuab hu ua Interlaced Scan. Muaj ob lub ntsiab lus sib txuas ntawm scan hauv kev siv: NTSC thiab PAL .
- NTSC yog ua raws li lub kaw lus ntawm 525-kab, 60 thaj tsam / 30 thav-ib-thib ob ntawm 60 Hz rau kev xa xov thiab tso saib cov duab video. Qhov no yog ib qho kev sib txuas ntawm txhua qhov thaij hauv ob lub tshav dav hlau ntawm 262 kab, uas yog ces muab tso kom pom cov duab thaij duab nrog 525 kab sib txuas kab. Lub teb chaws nrog lub koom haum NTSC yog hauv Teb Chaws Asmeskas, Canada, Mexico, qee feem ntawm Central thiab South America, Nyiv, Taiwan, thiab Kauslim teb.
- PAL yog nce raws 625 kab, 50 tshav dav hlau / 25 thav ntawv thib ob, 50HZ system. Qhov teeb liab yog sib cuam tshuam, zoo li NTSC, mus rau hauv ob thaj teb, muaj li ntawm 312 kab txhua. Tsis tas li ntawd, PAL muaj ib tus nqi khwv tau los ze rau qhov yeeb yaj kiab. PAL muaj tus ncej kwv yees li ntawm 25 hauv ib pliag, thaum cov ntsiab lus zaj duab xis yog nyob ntawm tus ncej ntawm 24 vib nas this ib ob. Lub teb chaws uas muaj PAL lub hauv paus muaj xws li UK, lub teb chaws Yelemees, Spain, Portugal, Ltalis, Tuam Tshoj, Is Nrias teb, feem ntau ntawm cov teb chaws Africa, thiab Middle East.
Kev Ntsuam Xyuas Dab Tsi Yog Li Cas
Nrog lub tswv yim ntawm lub tsev thiab chaw ua hauj lwm cov computers, nws tau nrhiav tau tias siv lub TV kws kho mob rau cov duab ntawm cov duab hauv computer tsis ua haujlwm zoo, tshwj xeeb tshaj yog cov ntawv nyeem. Qhov no yog vim cov nyhuv ntawm kev sib tshuam scan kev siv tshuab. Yuav kom tsim tau ib qho kev zoo siab thiab kev ncaj ncees ntawm kev nthuav tawm cov duab ntawm lub computer, kev siv tshuab luam yeeb kom raug tsim.
Txheeb zuam thev plaub los ntawm ib qho kev sib txuas ntawm interlaced rau hauv daim duab tso tawm ntawm ib qho screen los ntawm kev xa txhua kab (los yog kab hauv pixels) hauv qhov kev txiav txim kom tshwm sim los ntawm kev hloov lwm yam, raws li tau ua nrog interlaced scan. Hauv lwm cov lus, hauv cov duab scan, cov duab kab (lossis cov kab pixel) yog luam tawm hauv kev hais ua zauv (1,2,3) hauv qhov kev ntsuas ntawm sab saum toj mus rau hauv qab, tsis yog ua lwm txoj cai (kab lossis kab 1.3, 5, thiab lwm yam ... raws li txoj kab los yog kab 2,4,6).
Los ntawm kev soj ntsuas cov duab mus rau ib qho screen hauv ib lub cheb es tsis tsim lub duab los ntawm kev sib txuas ob zaug, ib qho yooj yim, xav paub ntau ntxiv cov duab yuav pom tau tias nws zoo dua rau saib cov ntsiab lus zoo, xws li cov ntawv nyeem thiab tsab ntawv tsa suab los kuj tsis tshua muaj kev cuam tshuam rau interlace flicker.
Pom cov cuab yeej no yog ib txoj kev los txhim kho txoj kev uas peb pom cov duab ntawm lub vijtsam video, kev siv cov tshuab luam tawm tshiab tom ntej siv rau DVD.
Kab Doubling
Nrog rau kev loj ntawm lub vijtsam loj siab txhais Plasma , LCD TVs, thiab video projectors , qhov kev daws teebmeem ua los ntawm TV, VCR, thiab DVD qhov chaw tsis muaj cuab kav ua zoo los ntawm qhov kev sib txuas ntawm kev sib tw.
Txhawm rau compensate, ntxiv nrog rau kev luam scan, TV makers kuj qhia txog lub tswv yim ntawm Kab Doubling.
Txawm hais tias muaj ntau txoj hauv kev no siv tau, hauv nws cov tub ntxhais kawm, TV nrog kab twv ua kom muaj peev xwm ua tau "kab ntawm kab", uas muab cov yam ntxwv ntawm txoj kab saum toj no nrog cov kab hauv qab xwv kom muab cov duab zoo dua. Cov kab tshiab no tau ntxiv rau cov kab qauv qub thiab tag nrho cov kab yog mam li kuaj ntawm cov vijtsam TV.
Txawm li cas los, tus drawback nrog kab doubling yog cov artifacts motion motion yuav ua tau, raws li cov kab tsim tshiab khiv kuj yuav tsum txav nrog cov yeeb yam hauv daim duab. Yog xav tawm cov duab, feem ntau cov kev yees duab yuav tsum tau ua.
3: 2 Pulldown - Hloov Mus Yees Duab Los Yees Duab
Txawm hais tias kev kuaj loj thiab kab ua ke twv kom sib haum los ua kom pom cov teeb meem ntawm cov duab sib txuas, tseem muaj lwm qhov teeb meem uas txwv tsis pub muaj qhov yeeb yaj kiab ntawm cov duab yeeb yaj kiab kom pom hauv TV. Rau PAL-raws li cov khoom siv thiab TVs, qhov no tsis yog qhov teeb meem loj li tus qauv PAL thiab tus ncej zaj duab xis npaum li cas yog qhov zoo heev, yog li yuav tsum kho me ntsis rau qhov uas qhia zaj yeeb yaj kiab tseeb ntawm PAL TV. Txawm li cas los, qhov no tsis yog qhov teeb meem nrog NTSC.
Qhov teeb meem nrog NTSC yog tias films feem ntau tua ntawm 24 ntu ib pliag thiab NTSC video yog tsim thiab tshwm sim nyob rau ntawm 30 ntas ib ob.
Qhov no txhais tau hais tias thaum ib zaj yeeb yaj kiab tau xa mus rau DVD (los yog videotape) hauv lub NTSC-raws li, qhov txawv cov nqi ntawm zaj duab xis thiab yees duab yuav tsum tau hais. Yog tias koj twb tau sim hloov lub 8 los sis 16 hli lub tsev yeeb yaj kiab los ntawm kev siv cov yeeb yaj duab ua yeeb yaj kiab raws li tus yeeb yam pom tau, koj yuav to taub qhov teeb meem no. Txij li cov duab thaij duab yog 24 vib nas this thib ob, thiab lub koob yees duab yog khawm ntawm 30 ntaiv ib pliag, cov duab yeeb yaj duab yuav pom nyhuv nyhuv thaum koj ua si koj cov duab thaij duab. Yog vim li cas rau qhov no yog tias qhov thaub qab ntawm qhov screen yog tsiv ntawm qeeb qeeb qeeb tshaj qhov yees duab ntas rau hauv lub koob yees duab, thiab txij li thaum lub zog tsis txuam tsis tau, qhov no ua rau cov nyhuv nyuab nyuab heev thaum naam muab xa mus yees duab tsis muaj kev hloov.
Los ntawm kev rhuav tshem cov duab, thaum ib zaj yeeb yaj kiab tso rau duab (seb DVD, VHS, los yog lwm hom ntawv), tus ncej thaij duab "stretched" los ntawm ib lub mis uas zoo dua ntais cov zauv zaj duab xis mus rau tus nqi yees duab.
Txawm li cas los xij, lo lus nug tseem tshuav li cas los tso saib qhov no rau ntawm TV.
Kuaj Scan thiab 3: 2 Pulldown
Yuav kom pom ib zaj yeeb yaj kiab hauv nws qhov tseeb tshaj plaws hauv lub xeev, nws yuav tsum tau qhia ntawm 24 thav ntawm ib ob rau ntawm ib qho kev sib tw lossis TV.
Yuav kom ua tau li no raws li qhov tseeb hauv NTSC-raws li, qhov chaw, xws li DVD player yuav tsum muaj 3: 2 lub txiaj ntsim ntawm cov nyom, rov qab qhov 3: 2 pulldown tus txheej txheem uas siv los muab cov yees duab rau DVD, thiab tso zis rau nws thawj 24 thav ntawv ib hom thib ob, thaum tseem ua tau raws li 30 nta ib qhov video thib ob tso saib ..
Qhov no yog ua tiav los ntawm ib tug neeg uas ua DVD uas muaj lub hom phiaj tshwj xeeb ntawm MPEG decoder, nrog rau kev xa mus rau qhov deinterlacer uas nyeem cov 3: 2 pulldown interlaced video teeb liab tawm ntawm DVD thiab rho tawm cov duab thaij tawm ntawm cov yeeb yaj kiab , kev soj ntsuam cov duab thaij, ua rau muaj qhov kho kom raug, thiab hloov cov duab tshiab no los ntawm kev siv video (Y, Pb, Pr) lossis HDMI txuas .
Yog hais tias koj tus neeg uas ua ntawv DVD muaj kev kuaj pom tsis muaj 3: 2, ces nws tseem yuav tsim cov duab smoother dua cov duab interlaced, raws li cov kev xaav scan DVD neeg uas ua ntawv yuav nyeem cov interlaced duab ntawm DVD thiab txheej txheem ib cov duab ntawm cov teeb liab thiab kis uas nyob rau lub TV lossis video projector.
Txawm li cas los xij, yog hais tias DVD Player muaj qhov sib ntxiv ntawm 3: 2 nrhiav kom tau nyiaj, tsis tas yuav koj cov yeeb yaj duab ua ib cov duab screwed scanned, tab sis koj yuav pom DVD zaj yeeb yaj kiab rau hauv lub xeev ze li qhov ua tau rau koj xav pom los ntawm tus qhov tseeb zaj duab xis projector, tshwj tsis yog tias nws yog tseem nyob rau hauv cov ntawv sau video.
Kuaj Scan thiab HDTV
Ntxiv nrog rau DVD, kev kuaj scan yog siv rau DTV, HDTV , Blu-Ray Disc, thiab TV broadcasting thiab.
Piv txwv, tus qauv txhais DTV yog tso tawm rau hauv 480p (tib yam ntxwv ua progressive scan DVD - 480 kab los yog pixel kab progressively scanned) thiab HDTV tau tshaj tawm ntawm 720p (720p kab los yog pixel kab progressively scanned) lossis 1080i (1.080 kab lossis pixel cov kab uas yog qhov sib tw ua ke ntawm 540 kab txhua) . Yuav kom tau txais cov teeb meem no, koj yuav tsum muaj HDTV nrog ib lub tshuab hluav taws xob built-in los yog HD tuner, HD Cable, lossis Satellite box.
Yam Koj Yuav Tsum Tau Txais Cov Ntawv Ntsuam Xyuas Luam Hlis
Yuav kom nkag siab txog kev luam scan, ob qhov kev tivthaiv, xws li DVD player, HD cable, lossis satellite lub thawv, thiab TV, video video, lossis video projector yuav tsum tau ua kom tiav qhov kev soj ntsuam (uas tag nrho yog yog yuav 2009 lossis tom qab ), thiab qhov khoom siv (DVD / Blu-Ray Disc player, Cable / Satellite Box), xav tau ib qho kev sib tw luam tawm video tso tawm, lossis DVI (Digital Video Interface) los yog HDMI (High Definition Multi Media Interface ) tso zis uas tso cai rau kev hloov ntawm cov txheej txheem thiab qib siab txhais tau cov duab scan rau ib lub TV zoo sib xws.
Nws yog ib qho tseem ceeb kom taw tes tias cov kev sib txuas ntawm Composite thiab S-Video tsis hloov cov duab thaij duab zuj zus. Tsis tas li ntawd, Yog tias koj nqai tuaj zuj zus mus rau qhov luam tawm ntawm cov luam tawm tsis tau cov duab scan TV, koj yuav tsis tau txais ib daim duab (qhov no tsuas yog siv rau feem ntau CRT TVs - tag nrho cov LCD, Ntshav, thiab OLED TVs yog cov kev kuaj kom tsis tiav).
Yuav kom pom cov kev kuaj loj nrog rov qab 3: 2 pulldown, cov DVD player los yog TV xav kom muaj 3: 2 lub txiaj ntsim ntawm tus xov tooj (tsis yog qhov teeb meem nrog txhua yam yuav 2009 lossis tom qab). Qhov xav tau yog rau cov neeg uas ua DVD uas muaj qhov 3: 2 lub txiaj ntsim ntawm cov xov tooj nrov thiab ua tau cov nuj nqi rov ua haujlwm nrawm, nrog rau cov kev luam scan muaj peev xwm saib cov duab li zaub los ntawm cov neeg uas ua DVD. Muaj cov ntawv xaiv zaub nyob hauv ob qho tib si soj luam theej duab DVD player thiab ib tus neeg ua tiav scan muaj peev xwm (HDTV) hauv TV uas yuav pab tau koj teeb tsa tau ib qho kev tawm tsam scan rau DVD player thiab TV lossis video projector.
Lub Kab Hauv Qab
Kuaj Scan yog ib qho ntawm cov ntsiab lus ntawm kev txhim kho cov TV thiab kev ua yeeb yam hauv tsev. Txij thaum nws pib thawj zaug, tej yam hloov zuj zus. DVD tam sim no coexists nrog Blu-duab tshav ntuj , thiab HDTV yog hloov mus rau 4K Ultra HD TV , thiab nrog qhov kev soj ntsuam ntawd tsis tau tsuas yog ua ib feem ntawm cov dluab tau tshwm nyob rau ntawm ib qho screen, tab sis kuj tau muab ib lub hauv paus ntxiv rau kev yees duab kev ua cov yees yim, xws li video upscaling .