Phase Detection Autofocus yog dab tsi PDAF ua haujlwm li cas
Phase Detection Autofocus yog dab tsi PDAF ua haujlwm li cas

Phase Detection Autofocus, PD Autofocus hauv Smartphones, Drawbacks ntawm PDAF, Yuav Ua Li Cas PDAF (Phase Detection Autofocus) ua haujlwm, PDAF yog dab tsi -

Cov koob yees duab yog qhov tseem ceeb ua nrog cov sensors, tswj qhov system, thiab lub cev muaj zog. Autofocus tuaj rau hauv daim duab los daws qhov teeb meem pom qhov muag tsis pom tshwm sim los ntawm kev ntsuas focal tsis raug. Autofocus thev naus laus zis kho cov duab tsom tsis zoo los ntawm kev ntseeg siab ntawm cov sensors kom pom qhov tseeb.

Ntau qhov kev tsim kho tom qab, Autofocus tau paub qhov txawv ntawm kev ua haujlwm, tsis muaj zog, thiab hybrid AF (Autofocus) sensors. Phase detective Autofocus (PDAF) tau tsim los ntawm kev ua haujlwm siab Autofocus sensor.

Raws li kev siv AF nquag siv, infrared lossis ultrasound nthwv dej los ntsuas qhov kev ncua deb ntawm qhov kev kawm, qhov kev ua haujlwm siab Autofocus siv cov theem tshawb pom, qhov sib txawv sensors, lossis ob qho tib si. Txawm li cas los xij, ob peb tus siv lub teeb infrared thaum tsis muaj lub teeb txaus.

Feem ntau ntawm niaj hnub smartphones thiab DSLRs koob yees duab tau nruab nrog cov thev naus laus zis no thiab ntseeg ntau dua lossis tsawg dua li cov thev naus laus zis ceev tshaj plaws uas ntsuas cov khoom hauv kev tsom.

Cia saib seb PDAF technology ua haujlwm li cas!

PDAF (Phase Detection Autofocus) ua haujlwm li cas?

Nrog rau kev hloov pauv hauv kev yees duab thev naus laus zis, cov tswv yim tshiab tsis muaj qhov kawg uas ua rau cov neeg tsis ntseeg siab. Yog tias ib tus yuav tsum nkag siab yooj yim dua li cas PDAF ua haujlwm, cia peb khawb rau hauv DSLR thev naus laus zis.

  • Cov koob yees duab tau nruab nrog ob daim iav thiab ob lub microlenses.
  • Thawj daim iav yog daim iav loj reflex thiab qhov thib ob yog daim iav me me.
  • Lub teeb ntes tau los ntawm sab nraud ntawm ob lub microlenses nkag mus rau hauv daim iav loj, uas yog tom qab ntawd cuam tshuam rau ntawm daim iav thib ob.
  • PDAF sensors tuaj rau hauv kev ua si tom qab lub teeb dhau los ntawm daim iav thib ob.
  • Lub teeb los ntawm daim iav thib ob yog coj mus rau PDAF sensor, uas coj nws mus rau pawg ntawm cov sensors.
  • Feem ntau, ob lub sensors raug ntsia rau ib qho AF point. Cov duab los ntawm cov sensors yog tom qab ntsuas los ntawm lub koob yees duab.
  • Yog tias cov duab tau txais tsis zoo ib yam, PDAF sensors qhia lub lens ntawm lub koob yees duab los kho kom haum.
  • Kom txog rau thaum lub teeb pom kev zoo raug teeb tsa, cov txheej txheem no tau rov ua ob peb zaug.
  • Sai li qhov ua kom pom tseeb yog ua tiav, AF system lees paub qhov ntawd thiab xa kev lees paub tias cov khoom taug qab yog nyob rau hauv tsom.

Autofocus teeb meem tshwm sim yog tias qhov kev ncua deb ntawm lub lens mount thiab lub koob yees duab sensor thiab qhov kev ncua deb ntawm lub lens mount thiab sensors tsis zoo ib yam. Txawm hais tias qhov kev piav qhia rau qhov no yog ntev, tag nrho cov no tshwm sim nyob rau hauv ib feem ntawm ib tug thib ob thiab yog li no suav hais tias yog tus ceev tshaj technology.

PDAF hauv Smartphones

Txawm hais tias cov txheej txheem PDAF tau siv dav hauv DSLRs, ntau lub xov tooj smartphones tau siv cov haujlwm no hauv lawv lub xov tooj smartphones.

Nws yuav siv sij hawm ib ncig ntawm 0.3 vib nas this los sib piv cov duab dhau los ntawm lub lens. Hmoov tsis zoo, smartphones tsis tuaj yeem nruab nrog ob lub PDAF sensors. Li no nws los nrog ib yam dab tsi hu ua 'Photodiodes'.

Lub photodiodes yog npog kom tso cai rau lub teeb los ntawm ib sab ntawm lub lens muab lub smartphone ob daim duab los sib piv thiab ua kom pom tseeb. Yog tias cov duab tau txais tsis nyob rau hauv kev ua kom pom tseeb ces cov sensors pab lub lens los hloov qhov tsim nyog.

Drawbacks ntawm PDAF:

  • Qhov teeb meem ntawm kev sib raug zoo ntawm lub sensor yog ib qho teeb meem loj yog tias cov tuam txhab lag luam tsis tau teeb tsa PDAF software txij li cov sensors yog tom qab ntawd ib lub koob yees duab cov lus qhia kom hloov qhov tsim nyog.
  • Teeb pom kev tsis zoo tej zaum yuav tsis tso cai rau PDAF sensors tsom cov duab kom raug.
  • Lub sij hawm-siv thaum sim kom lub lens kom pom tseeb siv dav apertures.

Tag nrho hauv ib qho, PDAF ua haujlwm zoo kawg nkaus thaum sim ntes cov ntsiab lus hauv kev txav raws li nws nrawm heev. Tso cai rau ntes portraits thiab tseem lub neej photography nyob rau hauv ib tug zoo kawg li txoj kev. Zuag qhia tag nrho, Phase nrhiav AF yog nrawm dua thiab muaj tseeb dua li qhov sib piv AF ib txwm muaj.

Nrog rau kev yees duab smartphones trending raws li kev nyiam tshiab, ntau tus neeg tab tom mus rau cov xov tooj uas tuaj nrog PDAF sensors.