Taw qhia
Koj puas tau thaij duab sab hauv tsev thiab pom cov txiv kab ntxwv tint? Los yog ib qho sab nraud nrog lub ntsej muag xiav? Cov teeb pom kev sib txawv - cov qhov muag teeb sov sov, lub hnub txias txias, cov raj fluorescent ntsuab - hloov xim ntawm txhua yam. Peb ob lub qhov muag cia li them nyiaj, yog li daim ntawv dawb zoo li dawb nyob txhua qhov chaw. Cov koob yees duab, txawm li cas los xij, xav tau kev pab. Qhov ntawd yog qhov twgauto white balance (AWB)los nyob rau hauv. Hauv ibkoob yees duab module, AWB txheeb xyuas qhov xwm txheej thiab kho cov xim kom lawv zoo li ntuj. Kab lus no piav qhia tias AWB ua haujlwm li cas, vim li cas nws thiaj li txawvkoob yees duab modulehom, thiab dab tsi los nrhiav.
White Balance yog dab tsi?
Dawb tshuav tshem tawm cov xim cam kom cov khoom uas pom dawb rau tib neeg lub qhov muag kuj yog xim dawb hauv daim duab. Lub teeb xim yog ntsuas hauv Kelvin (K) - tus lej qis yog sov (txiv kab ntxwv), cov lej siab txias (xiav). Lub koob yees duab yuav tsum paub cov xim kub ntawm lub teeb kom rov tsim cov xim kom raug.
Nws pib dawb tshuav nyiaj li cascia li kuaj pom lub teeb ci thiab siv qhov kev kho kom raug.
Yuav Ua Li Cas Auto White Balance Ua Haujlwm
AWB algorithm:
Tshawb pom lub teeb ci- los ntawm qhov nruab nrab pixel xim (qhov kev xav ntawm lub ntiaj teb grey) lossis nrhiav cov pixels ci ntsa iab uas yuav tsum yog dawb.
Siv cov txiaj ntsig- kho liab thiab xiav channel siv; ntsuab channel feem ntau yog sab laug raws li siv.
Zoo-tunes- siv lub rooj saib rau cov teeb pom kev sib xyaw (piv txwv li, fluorescent + qhov rais teeb).
Hauv ibcmos koob yees duab module, AWB feem ntau yog siv rau hauv cov duab teeb liab processor (ISP), xws li hauv hardware (on-sensor) lossis software (ntawm tus tswv CPU).
Why AWB Matters
No AWB, ahd koob yees duab moduleyuav tsim cov xim tsis muaj tseeb - phab ntsa dawb yuav zoo li liab hauv qab lub teeb fluorescent lossis daj hauv qab incandescent. AWB guarantees:
Cov xim sib xws ntawm cov teeb pom kev sib txawv.
Tsawg phau ntawv kho tom qab.
Txhim khu kev pom hauv computer (kev tshawb nrhiav pom tias yuav muaj xim nruab nrab).
AWB in Different Camera Module Types
- HD Lub Koob Yees Duab Module- Ib yamhd koob yees duab module(1080p) siv hauv webcams lossis endoscopes tau tsim-hauv AWB hauv nws ISP. Nws ua haujlwm zoo rau feem ntau sab hauv tsev thiab sab nraum zoov scenes, tab sis tej zaum yuav tawm tsam nyob rau hauv lub teeb xim muaj zog (xws li, liab ua haujlwm ua yeeb yam teeb).
- CMOS Lub Koob Yees Duab Module- Feem ntaucmos koob yees duab modulesensors tuaj nrog ISP uas suav nrog AWB. Rau cov kev cai embedded systems, koj tuaj yeem tua hardware AWB thiab siv koj tus kheej software algorithm yog tias koj xav tau kev tuav tshwj xeeb (xws li, kev kho mob cov duab qhov tseeb xim yog qhov tseem ceeb).
- Flexible Camera Module – A hloov tau lub koob yees duab module(piv txwv li, rau borescopes lossis endoscopes) feem ntau ua haujlwm hauv qhov nqaim, tsaus nti nrog teeb pom kev hauv LED. LEDs muaj qhov kub thiab txias (feem ntau yog nruab hnub los yog txias dawb). Hauv cov xwm txheej zoo li no, qhov nyiaj tshuav dawb ruaj (pre-set rau LED xim) yuav txhim khu kev ntseeg ntau dua li AWB, vim tias lub koob yees duab tsuas pom cov khoom hauv qab ib lub teeb ci. Txawm li cas los xij, ntau qhov hloov pauv hloov pauv tseem suav nrog AWB rau ntau yam.
- USB Lub Koob Yees Duab Module – A USB Lub Koob Yees Duab Moduletom qab UVC (USB Video Class) feem ntau nthuav tawm AWB tswj los ntawm kev ua haujlwm. Koj tuaj yeem pab lossis lov tes taw tsis siv neeg dawb tshuav nyiaj li cas hauv software. Cov modules no nrov rau kev siv plug-and-play.
- Raspberry Module Lub Koob Yees Duab-Qhovraspberry module koob yees duab(Official Raspberry Pi Camera Module) siv lub tsev qiv ntawv libcamera. Nws tso cai rau AWB los ntawm lub neej ntawd, tab sis koj tuaj yeem teeb tsa qhov kub thiab txias los yog lov tes taw AWB rau kev tswj hwm phau ntawv - muaj txiaj ntsig zoo rau kev yees duab astrophotography lossis tshuab pom qhov twg xav tau cov xim sib xws-rau-thav duab.
Limitations of AWM
Txawm AWB zoo tuaj yeem ua tsis tau:
- Scenes tsis muaj xim nruab nrab- lub paj liab sau tag nrho cov thav duab yuav ua tsis tau zoo: lub algorithm sim ua kom liab "nruab nrab", tig nws grey.
- Mixed teeb pom kev zoo- nruab hnub ci los ntawm lub qhov rais ntxiv rau cov teeb sov sab hauv tsev; lub koob yees duab yuav tsum xaiv qhov kev sib haum xeeb.
- Tsaus heev scenes- Tsawg teeb liab-rau-nrov piv ua rau kev kwv yees xim tsis tuaj yeem ntseeg tau.
Xaiv lub koob yees duab Module nrog Zoo AWB
- Nrhiav tus neeg siv kev hloov kho- lub peev xwm kaw AWB lossis teeb tsa xim kub yog qhov tseem ceeb hauv lub teeb ci tsis tu ncua.
- Tshawb xyuas ISP specs- siab zoohd koob yees duab moduleCov khoom lag luam los ntawm cov tuam txhab muaj npe nrov (xws li Sincere) siv AWB algorithms siab heev nrog cov xim kub saib-up rooj.
- Kuaj hauv qab koj lub teeb pom kev zoo- ntes cov duab piv txwv nyob rau hauv tib lub sijhawm koj lub koob yees duab yuav ntsib.
Sincere's Camera Modules
Ntawm Sincere, peb tsimkoob yees duab modulekhoom nrog txhim khu kev qha pib dawb tshuav nyiaj li cas:
- Cmos koob yees duab module- Hardware AWB with fine-tuning options.
- HD koob yees duab module- 1080p thiab 4K modules nrog cov xim ruaj khov.
- Flexible koob yees duab module- Xaiv qhov nyiaj tshuav dawb ruaj khov lossis AWB.
- USB Lub Koob Yees Duab Module- UVC ua raws, AWB tswj los ntawm cov qauv APIs.
- Raspberry module koob yees duab- MIPI-tshaj modules nrog libcamera AWB.
Cov ntsiab lus
Nws pib dawb tshuav nyiaj li casyog ib qho tseem ceeb feature rau txhua yamkoob yees duab moduleuas ua haujlwm nyob rau hauv lub teeb sib txawv. Nws cia li kho cov xim kom cov xim dawb saib dawb thiab scenes zoo li ntuj. Thaumhd koob yees duab modulethiabUSB Lub Koob Yees Duab Modulepab kiag li lawm muaj zoo default AWB, tej zaum koj yuav xav tau phau ntawv tswj rau cov hauj lwm tshwj xeeb. Ahloov tau lub koob yees duab modulenrog built-in LEDs yuav ua hauj lwm zoo dua nrog ruaj dawb tshuav nyiaj li cas. Rau embedded tej yaam num siv araspberry module koob yees duab, libcamera muab rau koj ob qho tib si tsis siv neeg thiab phau ntawv xaiv. Kev nkag siab AWB pab koj xaiv txoj caicmos koob yees duab modulerau qhov tseeb, zoo ib yam xim.
Hu rau Sincere los tham txog kojkoob yees duab modulethiabauto white balancekev xav tau.
