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Publikationer från KTH
Bachelor thesis . 2024
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Multiview Varieties of rolling Shutter Cameras

Authors: Berghofer, Emily;

Multiview Varieties of rolling Shutter Cameras

Abstract

Denna studie undersöker så kallade rolling-shutter-kameror och hur bilder tagna av dessa kameror när de är i rörelse kan användas i 3D-rekonstruktion. Till skillnad från den mer förekommande hålkameramodellen, som tar hela bilden på en gång, tar en rolling-shutter-kamera en bild genom att skanna varje pixelrad individuellt. Detta innebär att fotografier tagna medan kameran eller motivet rör på sig blir skeva. Dessa skeva bilder utgör i sin tur ett problem i 3D-rekonstruktion eftersom det komplicerar processen att hitta punkter i de olika bilderna som avbildar samma 3D-punkt. I denna uppsats studerar vi scenariot där två rolling-shutter-kameror rör sig med konstant hastighet längs oberoende riktningvektorer samtidigt som de fotograferar samma objekt, positionerat mellan dem. Vi beräknar funktionen som mappar punkter i det projektiva 3-rummet till deras motsvarande punkter i det projektiva 2-rummet för vardera av de två bilderna. Zariski-slutningen av denna funktion är de två kamerornas multivyvarieteter. Multivyvarieteterna definieras av ett polynom vars nollställe innehåller alla punktpar i de två bilderna som avbildar samma 3D-punkt. Slutligen studerar vi multivyvarieteterna vidare genom att titta på Newton-polytopen.

This study looks at the rolling shutter camera model and how pictures taken by moving cameras of this model can be used in 3D reconstruction. Unlike how the widely used pinhole camera model takes the entire picture in one go, a rolling shutter camera takes a picture by scanning each pixel line individually. This poses an issue when the cameras are moving as they photograph since the pictures will become skewed. These skewed images in turn pose a problem in the 3D reconstruction process as it complicates the process of finding points in the different pictures that depict the same 3D point. In this thesis, we study two rolling shutter cameras moving with constant speed along independent direction vectors as they photograph a subject in between them. We compute the function that maps points in the projective 3 space to their projective 2 space counterparts in each of the two pictures. The Zariski closure of this function is the multiview variety of the two cameras. The multiview variety is defined by a polynomial whose zero-locus contains all pairs of points in the two pictures that depict the same 3D point. Finally, we further study the multiview variety by looking at the Newton polytope.

Country
Sweden
Related Organizations
Keywords

Rolling Shutter Cameras, Matematik, Algebra, Computer Vision, Rolling-Shutter-Kameror, Algebraiskt Datorseende, Algebraic Vision, Datorseende, Mathematics

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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