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Dawb Tshuav Ntawm Kev Ua Si

Dawb Tshuav Ntawm Kev Ua Si

Nov 16, 2017

  

Cov kob tswj xim thiab kev tsis ua haujlwm ntawm lub tshav dav hlau yog qhov tseem ceeb ntawm cov yeeb yam ntawm LED, thiab tseem yog ib qho qauv tseem ceeb los ntsuas qhov xim ncaj ncees. Yog li, xim liab, xim ntsuab thiab xiav xim ntawm LED cov vijtsam yuav tsum tau muab kho kom dawb. Nws yuav tsum hais tias 3 lub ntsiab xim yog tseem ntshiab dawb [10] nyob tib theem grey.


Tsis tas siv cov xim gamut correction system LED zaub, tsuas yog xim liab, ntsuab, xiav 3 thawj xim LED tshuav nyiaj yuav ua tau [11-12]. Qhov kev tshuav dawb hauv cov txheej txheem kev ntsuas kev ua si, ntxiv rau qhov tseeb ntawm cov hauj lwm dawb, yuav tsum tau xav txog seb qhov luminous siv ntawm LED tuaj yeem ua raws li kev cai ntawm gamut kho, ie, mis (10), thiab tsis txhob tso khoom tshiab vim txaus peev xwm tsis txaus.


Hauv daim ntawv no, txoj kev sib koom tes xim (0.313,0.329) ntawm D65 standard light source yog suav tias yog lub hom phiaj ntawm cov xim av xim dawb. Yog li ntawd, tsuas yog lub hom phiaj uas ci ntsa iab ntawm Yaim tom qab dawb tshuav, thiab lub hom phiaj peb qhov txiaj ntsig Xaim thiab Zaim tau txais.


Hom (11) piav qhia txog txheej txheem ntawm kev tshuav dawb, xim kho tom qab tau txais tom qab xim liab, ntsuab thiab xiav xim ntawm M, N, tsis txhob muab peb qhov txiaj ntsig tau tsim rau dawb m, N, peb hnia nqi L rau cov dawb sib npaug coefficients ntawm 3 thawj xim, txhua xim yog siv los kho qhov siv thaum kawg, tib qhov gray qib tib xim ntawm LED teeb rau lub synthesis ntawm dawb ntshiab lub teeb, xim coordinates ntawm (0.313, 0.329).

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Hauv cov mis (12), qhov ntau npaum li cas yog Yaim, Xaim thiab Zaim, uas tuaj yeem tau los ntawm cov xim formula. Obviously, txawv Yaim qhov nqi xam ntau hom m, N, L. Yuav kom muaj lub siab zoo ntawm cov duab LED, ntau dua tus nqi ntawm Yaim, qhov zoo dua qhov ci ci ntawm lub tiaj dawb, thiab qhov ci ntawm LED liab (10 ) yog ntxiv qhia raws li LED:

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Hauv formula (13), thaum mkr1 + nkg1 + lkb1> 1, lub teeb liab ci teeb liab tsis tuaj yeem ua tau raws li qhov siab tshaj plaws ntawm "white field", LED cov zaub tsis thooj liab tiv thaiv tsis txaus yuav tshwm nyob rau hauv lub siab tshaj plaws "dawb teb" coj LED teeb pom kev zoo thiab xim pixels yuav txawv nrog lub cev LED coj pixel, txoj cai yawm zaub zoo.


Yog li ntawd, rau cov liab, ntsuab, xiav LED ntawm txhua cov duab pixel hauv cov duab tso tawm, yuav muaj kev tiv thaiv kev txwv (14). Thaum lub mis (14) txaus siab, kho qhov kev ntsuas thiab kev tshuav dawb yeej xam tau ib txhij.

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Yuav kom tau raws li hom (14), yuav tsum xaiv qhov tsim nyog Yaim tus nqi yog qhov nyuaj rau kev ncaj qha kev suav, qhov tseem ceeb tshaj plaws ntawm algorithm los ntawm bisearch algorithm, Y = YR + YG + YB, ntawm Yaim tus nqi ntawm bisearch ntawm 0 ~ Y, yuav ntxiv rau Yaim mus rau (12) yog xam, thiab hom pixels los txiav txim (14) qhia tag nrho cov hom (14), kom tau raws li tus nqi siab tshaj plaws ntawm Yaim tus nqi yog cov txiaj ntsig dawb thaum lub hom phiaj uas ci ntsa iab.


Rau tom qab ntawm lub rooj sablaj 1, thaum Yaim = 0.875X (YR + YG + YB), tom qab kho qhov kev ua lej, lub tshav pob xim dawb ua haujlwm ua ntej cov nyiaj tshuav dawb yog hauv W1 cov ntsiab lus hauv daim duab 4, thiab tom qab dawb tshuav, yuav hloov mus rau W2, thaum lub sij hawm dawb qhov nyiaj phiaj xim xim hauj lwm yog (0.313,0.329),


Raws li daim duab, qhov sib txawv ntawm cov xim xim ntawm cov duab pixel thiab lub hom phiaj xim xim tsawg tshaj 0.003 [3],

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Qhov no algorithm tuaj yeem ua kom tiav cov nyiaj tshuav dawb zoo heev. Raws li pom hauv daim duab 4, "dawb teb" coordinates yog txiav txim siab, thiab ua ntej peb thawj xim hauj lwm tom qab kho lus nrog LED, tag nrho cov pixels ntawm cov xim gamut yuav sib tshuam, qhov xim ntawm tag nrho cov pixels ntawm txhua xim LED yuav tso saib yuav txiav txim siab, thiaj li ua tiav kev tswj ntawm cov xim LED xim.


Thaum lub txiaj ntsig dawb tseem ceeb yog Yaim, qhov kev hloov kho qhov sib txawv rau qhov pixel tam sim no muaj peev xwm npaj tau ua (15):


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Lub sij hawm no, LED pom pixel ntawm liab, ntsuab, xiav LED grey qib I1, I2, I3, tom qab kho qhov kev ntsuas, qhov tso zis ntawm qhov tseeb grey siab yog:

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xaus


Zauv ntawm LED cov xim tso xim yog tsim muaj, thiab cov kev hloov ntawm gamut correlation yog siv los txhim kho qhov inconsistency ntawm LED tso xim gamut. Tsis tas li ntawd, cov txheej txheem ua los ntawm cov kev ua tsis raws cai los ntawm kev kho nyob rau hauv cov txiaj ntsig dawb yog sib tham ntxiv.


Cov kev ntsuam xyuas pom tias tom qab cov xim kho, LED teeb pom kev pom pixel ci thiab xim xim ntxiv, xim xim hauj lwm ntawm txhua cov pixel pixel thiab cov xim "dawb" xim muaj kev sib raug zoo ntawm cov phiaj xim kho, xim xim yuav ua tau tiav 0.005 yuam kev, "dawb "xim sib koom ua ke 0.003 qhov sib txawv ntawm qhov sib txawv yog qhov tsawg dua 3% LED, tuaj yeem txhim kho cov nyhuv ntawm cov npo saib.