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Author:Svan, Lauri Pellervo
Title:A stochastic optimization method for pose interpretation from sketches
Stokastinen optimointimenetelmä hahmon asennon tulkintaan piirroksista
Publication type:Master's thesis
Publication year:2010
Pages:[9] + 86      Language:   eng
Department/School:Informaatio- ja luonnontieteiden tiedekunta
Main subject:Vuorovaikutteinen digitaalinen media   (T-111)
Supervisor:Takala, Tapio
Instructor:Takala, Tapio
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto     | Archive
Keywords:stochastic methods
particle filter
sketch-based interaction
stokastiset menetelmät
partikkelifiltteri
luonnosteluun perustuva interaktio
Abstract (eng): This thesis evaluates a method for stochastic optimization method for pose interpretation from sketches.
The method consists of a stochastic search function, combined with a weighting method.
For search function, particle filtering is applied.
For weighting function, rendered contours of a 3D model are compared to sketch using Hausdorff distance.

The thesis starts with a short review of the existing state of practice in sketching and computer animation, followed by a similar evaluation of methods for articulated model tracking.
The areas of particle filtering and 3D contour generation are reviewed thoroughly.
The thesis represents a research setting, where two 3D models are evaluated in six different poses with best-case and real life case scenarios.

The results indicate that the method works well with best-case scenarios, but may fail in real life scenarios, when the sketch is partial or contains extraneous strokes.
Abstract (fin): Tutkielma arvioi menetelmää, joka tulkitsee hahmon asennon piirroksen pohjalta käyttäen stokastista optimointimenetelmää.
Menetelmä soveltaa optimointi- ja hakumenetelmänä partikkelifiltteriä, jonka kustannusfunktiona käytetään Hausdorffin etäisyyttä viivapiirroksen ja projisoidun 3D-kappaleen ääriviivojen välillä.

Tutkielma alkaa johdannolla aiempaan tutkimukseen, jossa kuvataan luonnosteluun perustuvan interaktion ja artikuloitujen mallien seurannan tutkimuksen nykytila.
Näitä seuraa syvällinen katsaus partikkelifilttereihin ja 3D-kappaleiden ääriviivojen piirtoon.
Tutkielma kuvaa koeasetelman, jossa 3D-malleja verrataan piirroksiin kuudessa eri asennossa koeasetelmassa suotuisien ja tosielämän tilanteiden välillä.

Tulokset osoittavat, että menetelmä toimii hyvin, jos koeasetelma on suotuisa, mutta se ei sovellu tosielämän asetelmaan.
Tosielämän asetelmissa viivapiirroksista puuttuu viivoja tai niissä on ylimääräisiä viivoja, joiden ansioista menetelmä päätyy huonoon lopputulokseen.
ED:2010-09-01
INSSI record number: 40371
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