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Audiovisual . 2015
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Audiovisual . 2015
License: CC BY NC
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Audiovisual . 2015
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Sylinterirekonstruktio

Authors: Åkerblom, Markku;

Sylinterirekonstruktio

Abstract

Kattava puurekonstruktio sylinterisovitukseen perustuen. Laserkeilaamalla kerätty pistepilvi segmentoidaan oksiin ja edelleen osasegmentteihin, jotka rekonstruoidaan yksitellen joukkona sylintereitä. Jokainen sylinteri sovitetaan pistepilven osasegmenttiin pienimmän neliösumman menetelmällä. Puun oksautumisrakenne eli topologia siirtyy segmentoinnista osaksi kattavaa sylinterimallia, jota kutsumme termillä quantitative structure model (QSM). Segmenttitasolla prosessi alkaa segmentin juuresta, johon lisätään "pistekerroksia", kunnes osasegmentin haluttu pituus--leveys-suhde saavutetaan. Alkuarvot pienimmän neliösumman iteratiiviselle sovitukselle löydetään hyödyntämällä geometrista analyysia osasegmentin muodostamaan pistepilveen. Jos sovitus ei suppene tai jos pistepilvidata on liian harvaa, voi mallin sylinterien väliin jäädä liian suuria välejä. Välit voidaan paikata jälkikäsittelyvaiheessa, jossa analysoidaan tyhjän tilan määrää peräkkäisten sylinterien sekä vanhempi--lapsisylinterien välissä. Kun yksittäisen segmentin rekonstruktio on valmis, käytetään heuristiikkaa estämään esimerkiksi liian suuret erot peräkkäisten sylinterien säteissä. Lisätietoja sylinterirekontruktiosta löytyy englanniksi tutkimusryhmän kotisivulta tai esim. open access -artikkelista "Fast Automatic Precision Tree Models from Terrestrial Laser Scanner Data" (http://www.mdpi.com/2072-4292/5/2/491). Tämän animaation on tuottanut Inversio-ongelmien tutkimusryhmä Tampereen teknillisen yliopiston Matematiikan laitoksella (http://math.tut.fi/inversegroup). Animaatio on tehty Blender-sovelluksella (http://www.blender.org). Musiikki: "Welcome to the Show" by Kevin MacLeod (http://incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/ Ääniefektit: FreeSound.org (https://www.freesound.org/) "SFX DTMF 01.wav" by Oddworld "MonsterSearch.mp3" by goony124 "sf3-sfx-menu-validate.wav" by broumbroum "tiza.mp3" by richymel "Sweep FX" by Goup_1 "Gun scope zoom in" by satanicupsman "Transition Whoosh 5a" by Speedenza "SynthPing" by DigiSample "error 2.aiff" by lluiset7 "sf3-sfx-menu-select.wav" by broumbroum Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/

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Keywords

inversio-ongelma, sovellettu matematiikka, puurekonstruktio, laserskannaus, pintarekonstruktio

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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).
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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.
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