Thaum lub teeb pom kev LED tshwm rau ntawm lub koob yees duab, qee zaum nws ua rau cov qauv tsis xav tau ntawm rippling bands lossis nthwv dej thoob plaws hauv daim duab-ib qho khoom cuav uas tuaj yeem cuam tshuam lossis txawm siv tsis tau hauv cov ntsiab lus tshaj tawm thiab ua yeeb yaj kiab. Cov qauv kev cuam tshuam no yog hu ua moiré effect, thiab nws yog qhov kev sib tw ua haujlwm rov qab rau txhua tus siv cov ntxaij vab tshaus LED hauv ib puag ncig uas muaj cov koob yees duab tam sim no: TV studios, theem tsim virtual, kev tshaj tawm hauv xov tooj cua, thiab kev tshaj tawm txog kev lag luam.
Kab lus no piav qhia txog qhov tshwm sim ntawm cov nyhuv moiré, cov khoom tsis pom kev uas cuam tshuam rau nws, thiab cov kauj ruam ua tau zoo uas cov tswv lag luam thiab cov kws tsim khoom tuaj yeem ua los txo lossis tshem tawm.
Dab tsi ua rau Moiré nyhuv?
Cov nyhuv moiré tshwm sim los ntawm kev sib cuam tshuam ntawm ob lub sijhawm ywj pheej. Ib qho LED zaub yog ua rau ntawm ib daim phiaj tsis tu ncua ntawm pixels, txhua lub teeb emitting ntawm lub suab taag. Lub koob yees duab sensor zoo ib yam li cov qauv- nws cov photosites (pixels) tau teeb tsa nyob rau hauv kab thiab txhua kab ntawm qhov chaw ruaj khov, tswj hwm los ntawm kev daws teeb meem sensor thiab lub lens siv.
Thaum ob daim phiaj no tau yees duab ntawm qee qhov deb, kaum sab xis, lossis zoom qib, lawv qhov sib txawv tsim ib qho kev cuam tshuam cuam tshuam. Qhov tshwm sim yog ib txoj hlua khi, nkhaus, lossis cov pob txha pob txha uas tsis muaj nyob hauv lub cev. Cov nyhuv yuav tshwm sim ntau dua thaum lub spatial zaus ntawm LED pixel grid ze ze rau qhov sib npaug ntawm lub koob yees duab sensor.
Cov kev hloov pauv tseem ceeb yog:
- Pixel suab ntawm LED zaub- pitches finer txo qhov muaj feem cuam tshuam nrog kev daws teeb meem ntawm lub koob yees duab, tab sis tsis txhob tshem tawm tag nrho.
- Lub koob yees duab sensor daws teeb meem thiab loj- siab dua- daws teeb meem sensors qauv nthuav dav ntxiv, uas tuaj yeem ua kom nrov npe nyob ze ntawm Nyquist zaus.
- Lens focal ntev thiab aperture- ntev focal ntev compresses lub pixel grid, nce qhov ceev ntawm LED pixels nyob rau hauv lub captured ncej; wider aperture softens daim phiaj los ntawm qhov tob - ntawm - teb plooj.
- Lub koob yees duab-rau- npo nrug thiab lub kaum sab xis- kev kho ib qho tuaj yeem hloov qhov kev sib raug zoo ntawm ob lub spatial zaus thiab hloov lossis tshem tawm cov qauv moiré.
- Refresh tus nqi ntawm LED zaub- thaum cov zaub refresh tus nqi tsis synchronized nrog lub koob yees duab shutter ceev los yog ncej tus nqi, kab rov tav banding (scan kab) yuav tshwm sim ntxiv rau moiré.
Tso saib -Side Factors to Consider
Thaum xaiv lossis teeb tsa LED zaub rau lub koob yees duab- ntsib cov ntawv thov, cov kev txwv hauv qab no cuam tshuam ncaj qha rau kev pheej hmoo moiré:
1. Pixel suab
Lub suab pixel zoo dua txhais tau tias ntau pixels hauv ib cheeb tsam. Thaum LED pixel daim phiaj yog qhov ntom ntom dua li lub koob yees duab lens tuaj yeem daws tau ntawm qhov ntev focal ntev, daim phiaj ua optically "tsis pom," thiab moiré tsis tuaj yeem tsim. Rau studio thiab virtual ntau lawm daim ntaub ntawv, panels nrog ib tug pixel suab hauv qab 2.5 hli feem ntau nyiam. Txawm li cas los xij, xaiv lub suab zoo dua kom tsis txhob muaj moiré yog kev sib pauv hloov pauv - qhov me me pixel pitches nqa siab dua ib - vaj huam sib luag tus nqi, thiab qhov tob tob ntawm qhov chaw los ntawm qhov dav apertures siv hauv virtual ntau lawm tuaj yeem cuam tshuam qhov plooj kom zoo dua ntawm aperture nqaim.
2. Tus nqi refresh
LED cov lus siv hauv cov ntsiab lus tshaj tawm yuav tsum ua haujlwm ntawm tus nqi tshiab uas siab txaus kom tsis txhob cuam tshuam nrog lub koob yees duab kaw. Ib qho kev hloov tshiab ntawm 3,840 Hz lossis siab dua yog feem ntau pom zoo rau flicker - ntes pub dawb ntawm tus qauv tus nqi (24, 25, 30, 50, 60 fps). Cov nqi qis dua tuaj yeem ua rau pom cov kab tsaus nti hauv cov duab uas tau ntes thaum lub koob yees duab kaw nrawm dua li cov duab scan lub voj voog.
3. Vaj Huam Sib Luag Flatness thiab Seam Alignment
Lub cev seams nruab nrab ntawm cov khoom siv LED tsim ib lub sijhawm thib ob. Yog hais tias cov txee tsis raug raws nraim-tshwj xeeb tshaj yog nyob rau hauv ntau yam loj- vaj huam sib luag teeb tsa- cov kab sib txuas ua ke tuaj yeem cuam tshuam nrog lub koob yees duab sensor los ua kom qis dua - zaus moiré qauv ywj siab ntawm pixel suab.
Lub koob yees duab-Sab thiab kev txo qis ua haujlwm
Hais txog moiré tsis tshua muaj kev txwv rau kev xaiv kho vajtse ib leeg. Ntawm - teeb tsa thiab kev hloov kho ua haujlwm ua lub luag haujlwm tseem ceeb sib npaug:
Kho lub koob yees duab lub kaum sab xis thiab txoj hauj lwm
Tig lub koob yees duab lossis phab ntsa LED los ntawm 1-3 degrees txawm tias qhov sib piv ntawm lawv qhov kev sib dhos ua ke tuaj yeem cuam tshuam cov theem kev sib raug zoo ntawm ob daim phiaj. Qhov no yog ib qho ntawm cov kev hloov kho yooj yim tshaj plaws thiab tam sim no muaj.
Hloov qhov Focal Length los yog Distance
Zooming nyob rau hauv los yog tawm hloov tus naj npawb ntawm LED pixels mapped rau lub sensor, hloov cov kev sib cuam tshuam ntawm spatial frequencies. Tsiv lub koob yees duab los ze dua lossis deb dua ua tiav cov txiaj ntsig sib piv. Ib qho kev hloov me me ntawm ob peb feem pua hauv kev zoom lossis kev hloov pauv me me feem ntau txaus.
Siv Diffusion lossis Low-Contrast Lim
Lens cov ntxaij lim dej uas qhia me ntsis diffusion soften cov ciam teb nyuaj ntawm txhua LED pixel raws li ntes los ntawm lub sensor, zoo txo qhov spatial zaus ntawm daim phiaj los ntawm lub koob yees duab qhov kev xav. Txoj kev no yog siv nyob rau hauv virtual ntau lawm thiab studio ib puag ncig uas qhov zoo nkauj tso cai rau nws.
Match Shutter Angle rau Refresh Rate
Rau kev ntes cov yeeb yaj kiab, teeb tsa lub koob yees duab kaw lub kaum ntse ntse kom ua raws li cov duab lub voj voog tshiab tiv thaiv cov kab scan ntawm LED vaj huam sib luag los ntawm kev ntes ib nrab - voj voog. Ntawm 3,840 Hz nrog 180℃kaw, qhov no yog ncaj nraim ntawm feem ntau tus qauv tus nqi. Ntawm cov nqi qis dua, nrhiav lub kaum ntse ntse sib xws yuav tsum tau suav.
Thov Hauv -Lub Koob Yees Duab Anti-Aliasing lossis Post-Kev Ua Haujlwm
Qee lub koob yees duab tshuab tso cai rau software tiv thaiv -aliasing thaum ntes. Hauv kev tshaj tawm -kev tsim khoom, lub hom phiaj zaus- sau npe lim tuaj yeem txo cov khoom cuav moiré hauv cov duab khaws cia, txawm tias nws zoo dua los daws qhov teeb meem ntawm qhov chaw.
Cov ntsiab lus
Cov nyhuv moiré nyob rau hauv LED zaub daim ntawv thov yog ib tug kwv yees qhov tshwm sim ntawm ob tug overlapping periodic qauv. Nws qhov hnyav yog nyob ntawm kev sib raug zoo ntawm pixel suab, lub koob yees duab sensor daws teeb meem, teeb tsa lub lens, thiab saib geometry. Kev txo qis ua ke ua ke cov kev xaiv kho vajtse- zoo pixel suab, siab refresh npaum li cas, meej vaj huam sib luag alignment -nrog rau - teeb tsa kev kho xws li lub koob yees duab lub kaum ntse ntse, focal ntev, thiab shutter chaw. Kev nkag siab txog cov kev sib cuam tshuam no pab cov neeg ua haujlwm tuaj txog ntawm qhov kev teeb tsa ua haujlwm tau zoo rau feem ntau tshaj tawm thiab cov xwm txheej tshwm sim yam tsis tas yuav tsum tau sim - thiab - kev daws teeb meem yuam kev rau hnub tsim khoom.