Kev nthuav tawm cov duab digital feem ntau suav nrog kev cuam tshuam-ib txheej txheem uas ua rau kom qhov loj ntawm pixels hauv ib daim duab.
Qee lub koob yees duab digital-feem ntau taw tes-thiab-tua lub koob yees duab thiab xov tooj-siv interpolation los tsim digital zoom. Qhov no tso cai rau koj tsom mus rau cov ntsiab lus tshaj qhov siab tshaj plaws uas tso cai los ntawm lub koob yees duab lub lens. Cov kev pab cuam duab duab xws li Adobe Photoshop kuj siv kev cuam tshuam hauv kev tsim kho tom qab tsim khoom.
Feem ntau, muaj plaub hom kev cuam tshuam: ze tshaj plaws-neeg zej zog, bilinear, bicubic, thiab fractal. Paub me ntsis txog txhua tus tuaj yeem pab koj tau txais txiaj ntsig zoo tshaj plaws ntawm koj cov duab.
Digital zoom yog software-based thiab ntiav qee hom kev cuam tshuam. Hauv qhov sib piv, kho qhov muag zoom cia siab rau qhov tseeb, lub cev lub lens kom nthuav tawm cov duab nyob deb. Optical zoom ua kom pom tseeb, zoo dua cov duab zoo dua li digital zoom. Yog tias koj siv ib qho ntawm cov koob yees duab no, txav mus ze rau qhov kev kawm yuav ua rau koj tau txais kev txhaj tshuaj zoo dua li siv lub zoom digital.
Kev nce tus duab qhov loj yog feem ntau tsis pom zoo. Interpolation ntxiv cov ntaub ntawv rau cov duab qub, uas tuaj yeem qhia qhov tsis pom tseeb, cov khoom cuav, pixelation, thiab lwm yam teeb meem uas tuaj yeem ua rau cov duab tsis zoo.
Nearest-Neighbor Interpolation
Nyob ze-neeg zej zog interpolation feem ntau yog siv hauv-lub koob yees duab los tshuaj xyuas koj cov kev txhaj tshuaj thiab nthuav lawv kom koj pom cov ntsiab lus. Nws tsuas ua rau cov pixels loj dua, thiab cov xim ntawm lub pixel tshiab yog tib yam li qhov ze tshaj qub pixels. Nws tsis haum rau cov duab loj rau luam tawm vim nws tuaj yeem tsim cov jaggies-tseem hu ua pixelation.
kab hauv qab
Bilinear interpolation siv cov ntaub ntawv los ntawm tus thawj pixel, thiab plaub ntawm pixels uas kov nws, los txiav txim rau xim ntawm pixel tshiab. Nws tsim cov txiaj ntsig zoo, tab sis nws txo qis qhov zoo. Cov duab nthuav dav li no tuaj yeem ua qhov muag plooj.
Bicubic Interpolation
Bicubic interpolation yog qhov zoo tshaj plaws ntawm pawg. Nws tso siab rau cov ntaub ntawv los ntawm thawj pixel thiab 16 ib puag ncig pixels los tsim cov xim ntawm pixel tshiab.
Bicubic interpolation yog qhov siab dua li ob txoj hauv kev, thiab nws tuaj yeem tsim cov duab zoo. Bicubic interpolation muaj ob qhov sib txawv los pab koj kho koj cov duab: "smother" thiab "sharper."
Txawm tias qhov no yog ib qho ntawm cov kev xaiv zoo tshaj plaws, qhov loj dhau ntawm qhov dhia loj tuaj yeem txo cov duab zoo.
Fractal Interpolation
Tseem siv rau cov ntawv luam loj heev, cov qauv fractal interpolation los ntawm ntau pixels dua li bicubic interpolation. Nws tsim cov npoo ntse dua thiab tsis pom qhov muag tab sis xav tau cov software tshwj xeeb-qib kev khiav haujlwm. Cov tshuab luam ntawv tshaj lij feem ntau siv fractal interpolation.
