Dab tsi yog aFisheye Lens?A fisheye lens yog hom koob yees duab lo ntsiab muag uas tsim los tsim kom pom qhov dav ntawm ib qho chaw, nrog rau qhov muaj zog heev thiab pom kev sib txawv. Fisheye lo ntsiab muag tuaj yeem ntes qhov dav dav ntawm qhov pom, feem ntau mus txog 180 degrees lossis ntau dua, uas tso cai rau tus kws yees duab ntes thaj chaw loj heev ntawm qhov chaw hauv ib qho kev txhaj tshuaj.

Lub lens fisheye

Fisheye lo ntsiab muag muaj npe tom qab lawv qhov txawv txav tsis zoo, uas tsim cov duab ncig lossis lub thoob-zoo li tus duab uas tuaj yeem ua rau exaggerated thiab stylized. Cov nyhuv distortion yog tshwm sim los ntawm txoj kev uas lub lens refracts lub teeb thaum nws dhau los ntawm cov iav nkhaus ntawm lub lens. Cov nyhuv no tuaj yeem siv tau zoo los ntawm cov kws yees duab los tsim cov duab tshwj xeeb thiab muaj zog, tab sis nws kuj tuaj yeem muaj kev txwv yog tias xav tau cov duab zoo nkauj dua.

Fisheye lo ntsiab muag tuaj nyob rau hauv ntau yam sib txawv, nrog rau cov tsom iav qhov muag, cov lo ntsiab muag-lub voj voog fisheye lo ntsiab muag, thiab cov lo ntsiab muag full-frame fisheye. Txhua hom fisheye lo ntsiab muag no muaj nws tus yam ntxwv tshwj xeeb thiab tsim nyog rau ntau hom kev yees duab.

Tsis zoo li rectilinear lo ntsiab muag,fisheye lo ntsiab muagtsis yog tag nrho cov yam ntxwv ntawm focal ntev thiab aperture ib leeg. Lub kaum sab xis ntawm kev pom, daim duab kab, hom phiaj xwm, thiab qhov ntsuas ntsuas qhov sib txawv ntawm nws tus kheej ntawm cov no.

Hom kev siv hom

Circular fisheye lo ntsiab muag

Thawj hom fisheye lo ntsiab muag tsim tau yog "lub voj voog" lo ntsiab muag uas tuaj yeem tsim cov duab ncig nrog 180-degree qhov pom. Lawv muaj qhov ntev focal ntev heev, feem ntau yog li ntawm 7mm mus rau 10mm, uas ua rau lawv tuaj yeem ntes qhov pom dav dav ntawm qhov chaw.

Lub voj voog fisheye lens

Circular fisheye lo ntsiab muag yog tsim los tsim cov duab ncig ntawm lub koob yees duab sensor lossis zaj duab xis dav hlau. Qhov no txhais tau hais tias cov duab uas tau tshwm sim muaj ib puag ncig nrog cov ciam teb dub nyob ib puag ncig thaj chaw ncig, tsim kom muaj qhov tshwj xeeb "fishbowl" nyhuv. Cov ces kaum ntawm ib daim duab ncig fisheye yuav dub tag. Qhov no blackness yog txawv los ntawm maj mam vignetting ntawm rectilinear lo ntsiab muag thiab teem rau sai sai. Daim duab ncig tuaj yeem siv los tsim kev nthuav dav thiab muaj tswv yim sib xyaw. Cov no muaj 180 ° ntsug, kab rov tav thiab kab pheeb ces kaum ntawm qhov pom. Tab sis nws kuj tuaj yeem yog qhov txwv yog tias tus kws yees duab xav tau qhov sib npaug ntawm qhov sib piv.

Lub voj voogfisheye lo ntsiab muagfeem ntau yog siv rau hauv kev yees duab muaj tswv yim thiab kos duab, xws li hauv kev yees duab kos duab, kev yees duab paub daws teeb, thiab kev yees duab ntaus kis las. Lawv kuj tuaj yeem siv rau kev tshawb fawb thiab kev siv tshuab uas yuav tsum tau pom dav dav, xws li hauv astronomy lossis microscopy.

Diagonal fisheye lo ntsiab muag (aka full-frame lossis rectangular)

Raws li fisheye lo ntsiab muag tau txais koob meej nyob rau hauv kev yees duab dav dav, cov tuam txhab koob yees duab tau pib tsim cov lo ntsiab muag fisheye nrog lub voj voog loj loj kom npog tag nrho cov duab plaub. Lawv hu ua kab pheeb ces kaum, lossis qee zaum "rectangular" lossis "full-frame", fisheyes.

Diagonal fisheye lo ntsiab muag yog hom fisheye lo ntsiab muag uas tuaj yeem tsim lub ntsej muag dav dav ntawm ib qho chaw nrog kab pheeb ces kaum ntawm qhov pom ntawm 180 txog 190 degrees, thaum lub kaum sab xis thiab ntsug ntawm qhov pom yuav me dua. Cov lo ntsiab muag no tsim qhov kev xav tsis zoo thiab tsis txaus ntseeg, tab sis tsis zoo li lub ntsej muag lub ntsej muag, lawv sau tag nrho cov duab plaub ntawm lub koob yees duab sensor lossis zaj duab xis dav hlau. Txhawm rau kom tau txais cov txiaj ntsig zoo ib yam ntawm cov koob yees duab digital nrog cov ntsuas me me, yuav tsum muaj qhov ntev focal ntev.

Cov nyhuv distortion ntawm kab pheeb ces kaumfisheye lenstsim kom muaj qhov tshwj xeeb thiab ua kom zoo nkauj uas tuaj yeem siv tswv yim los ntawm cov kws yees duab los ntes cov duab zoo nkauj thiab ntxim nyiam. Qhov kev xav tsis thoob tuaj yeem tsim qhov kev nkag siab ntawm qhov tob thiab txav mus rau hauv ib qho chaw, thiab tuaj yeem siv los tsim cov ntsiab lus tsis txaus ntseeg thiab surreal.

Diagonal fisheye lens

Portrait los yog cropped-lub voj voog fisheye lo ntsiab muag

Cropped-lub voj voogfisheye lo ntsiab muagyog lwm hom fisheye lo ntsiab muag uas muaj, ntxiv rau lub voj voos thiab lub ntsej muag lub ntsej muag uas kuv tau hais dhau los. Ib qho nruab nrab ntawm ib kab pheeb ces kaum thiab lub voj voog fisheye muaj cov duab ncig zoo rau qhov dav ntawm zaj duab xis hom es tsis yog qhov siab. Yog li ntawd, ntawm txhua hom yeeb yaj kiab uas tsis yog square, daim duab ncig yuav raug txiav rau saum thiab hauv qab, tab sis tseem qhia cov npoo dub ntawm sab laug thiab sab xis. Hom ntawv no hu ua "portrait" fisheye.

Cropped-circle fisheye lens

Cov lo ntsiab muag no feem ntau muaj qhov ntev ntawm ib ncig ntawm 10-13mm thiab qhov pom ntawm kwv yees li 180 degrees ntawm lub koob yees duab qoob loo-sensor.

Cropped-circle fisheye lo ntsiab muag yog ib qho kev xaiv pheej yig dua piv rau cov lo ntsiab muag tag nrho ntawm lub ntsej muag, thiab lawv muab qhov kev pom tshwj xeeb nrog cov nyhuv cuam tshuam.

Miniature fisheye lo ntsiab muag

Cov koob yees duab me me, tshwj xeeb tshaj yog thaum siv los ua lub koob yees duab kev ruaj ntseg, feem ntau zoo li muaj lub ntsej muag ntsej muag kom pom kev zoo tshaj plaws. Cov lo ntsiab muag me me, xws li M12 fisheye lo ntsiab muag thiab M8 fisheye lo ntsiab muag, yog tsim los rau cov qauv me me sensors imagers feem ntau siv hauv cov koob yees duab kev ruaj ntseg.Ntau cov duab sensor hom ntau thiab tsawg siv suav nrog 1⁄4″, 1⁄3″, thiab 1⁄2″ . Nyob ntawm thaj chaw nquag ntawm cov duab sensor, tib lub lens tuaj yeem tsim cov duab ncig ntawm cov duab loj dua (xws li 1⁄2″), thiab tag nrho cov duab ntawm ib qho me me (xws li 1⁄4″).

Cov duab piv txwv ntes tau los ntawm CHANCCTV's M12fisheye lo ntsiab muag:

Cov duab piv txwv ntes tau los ntawm CHANCCTV's M12 fisheye lo ntsiab muag-01

Cov duab piv txwv ntes tau los ntawm CHANCCTV's M12 fisheye lo ntsiab muag-02

Cov duab piv txwv ntes tau los ntawm CHANCCTV's M12 fisheye lo ntsiab muag-03