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Analysis of Remote Sensing Image Super Resolution using Fluid Lenses

by Pejman Rasti

Institution: Tartu University
Year: 2017
Keywords: kaugseire; pildittlus; signaalittlus; kujutise anals; ltsed; vedelltsed; remote sensing; image processing; signal processing; image analysis; lenses
Posted: 02/01/2018
Record ID: 2153937
Full text PDF: http://hdl.handle.net/10062/55917


Abstract

Kesolevas doktorits uuriti nii riist- kui ka tarkvaralisi lahendusi piltide ttlemiseks. Riistvaralise poole pealt pakuti lahenduseks uudset vedelltse, milles on dielektrilisest elastomeerist kihilise tituriga membraan otse optilisel teljel. Doktorit kigus arendati vlja kaks prototpi kahe erineva dielektrilisest elastomeerist kihilise tituriga, mille aktiivne ala oli hel juhul 40 ja teisel 20 mm. Ltse t vastas elastomeeri deformatsiooni mehaanikale ja suhtelistele muutustele fookuskauguses. Muutuste demonstreerimiseks meniskis ja ltse fookuskauguse mtmiseks kasutati laserkiirt. Katseandmetest selgub, et muutuste tekitamiseks on vajalik pinge vahemikus 50 kuni 750 volti. Tarkvaralise poole pealt pakuti uut satelliitpiltide parandamise ssteemi. Pakutud ssteem jagas mrase sisendpildi DT-CWT laineteisenduse abil mitmeteks sagedusalamribadeks. Prast mra eemaldamist LA-BSF funktsiooni abil suurendati pildi resolutsiooni DWT-ga ja krgsagedusliku alamriba piltide interpoleerimisega. Interpoleerimise faktor algsele pildile oli pool sellest, mida kasutati krgsagedusliku alamriba piltide interpoleerimisel ning superresolutsiooniga pilt rekonstrueeriti IDWT abil. Kesolevas doktorits pakuti tarkvaraliseks lahenduseks uudset snastiku baasil ttavat super-resolutsiooni (SR) meetodit, milles luuakse paarid suure resolutsiooniga (HR) ja madala resolut-siooniga (LR) piltidest. Kigepealt jagati vastava snastiku loomiseks HR ja LR paarid omakorda osadeks. Esialgse HR kujutise saamiseks LR sisendpildist kombineeriti HR osi. HR osad valiti snastikust nii, et neile vastavad LR osad oleksid vimalikult lhedased sisendiks olevale LR pildile. Iga valitud HR osa heledust korrigeeriti, et vhendada krvuti asuvate osade heleduse erinevusi superresolutsiooniga pildil. Plokkide efekti vhendamiseks arvutati saadud SR pildi keskmine ning bikuupinterpolatsiooni pilt. Lisaks pakuti kesolevas doktorits vlja kernelid, mille tulemusel on vimalik saadud SR pilte teravamaks muuta. Pakutud kernelite thususe testamiseks kasutati [83] ja [50] poolt pakutud resolutsiooni parandamise meetodeid. Superresolutsiooniga pilt saadi iga kerneli tehtud HR pildi kombineerimise teel alpha blendingu meetodit kasutades. Pakutud meetodeid ja kerneleid vrreldi erinevate tavaliste ja kaasaegsete meetoditega. Kvantita-tiivsetest katseandmetest ja saadud piltide kvaliteedi visuaalsest hindamisest selgus, et pakutud meetodid on tavaliste kaasaegsete meetoditega vrreldes paremad.; In this thesis, a study of both hardware and software solutions for image enhancement has been done. On the hardware side, a new liquid lens design with a DESA membrane located directly in the optical path has been demonstrated. Two prototypes with two different DESA, which have a 40 and 20 mm active area in diameter, were developed. The lens performance was consistent with the mechanics of elastomer deformation and relative focal length changes. A laser beam was used to show the change in the meniscus and to measure the focalAdvisors/Committee Members: Anbarjafari, Gholamreza, juhendaja (advisor), Keifer, Rudolf, juhendaja (advisor).

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