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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

LDD: Learned Detector and Descriptor of Points for Visual Odometry

Aksjonova, Jevgenija January 2018 (has links)
Simultaneous localization and mapping is an important problem in robotics that can be solved using visual odometry -- the process of estimating ego-motion from subsequent camera images. In turn, visual odometry systems rely on point matching between different frames. This work presents a novel method for matching key-points by applying neural networks to point detection and description. Traditionally, point detectors are used in order to select good key-points (like corners) and then these key-points are matched using features extracted with descriptors. However, in this work a descriptor is trained to match points densely and then a detector is trained to predict, which points are more likely to be matched with the descriptor. This information is further used for selection of good key-points. The results of this project show that this approach can lead to more accurate results compared to model-based methods. / Samtidig lokalisering och kartläggning är ett viktigt problem inom robotik som kan lösas med hjälp av visuell odometri -- processen att uppskatta självrörelse från efterföljande kamerabilder. Visuella odometrisystem förlitar sig i sin tur på punktmatchningar mellan olika bildrutor. Detta arbete presenterar en ny metod för matchning av nyckelpunkter genom att applicera neurala nätverk för detektion av punkter och deskriptorer. Traditionellt sett används punktdetektorer för att välja ut bra nyckelpunkter (som hörn) och sedan används dessa nyckelpunkter för att matcha särdrag. I detta arbete tränas istället en deskriptor att matcha punkterna. Sedan tränas en detektor till att förutspå vilka punker som är mest troliga att matchas korrekt med deskriptorn. Denna information används sedan för att välja ut bra nyckelpunkter. Resultatet av projektet visar att det kan leda till mer precisa resultat jämfört med andra modellbaserade metoder.
2

Využití obecně orientovaných snímků v geoinformatice / Generally oriented images in geoinformatics

Káňa, David January 2013 (has links)
This thesis deals with methods and algorithms used in computer vision for fully automatic reconstruction of exterior orientation in ordered and unordered sets of images captured by digital calibrated cameras without prior informations about camera positions or scene structure. Existing methods for key points detection, matching and relative orientation of images are described. Methods and strategies for merging submodels into global reconstruction including complex bundle adjustment are proposed. This thesis also adresses issues of direct and indirect georeferencing of images and orthophoto production problems. An outline related to technology of the capturing images by multiple camera systems is given and possible usage of oblique images is described, especially technology of the automatic 3D models texturing and measurements in one image using restrictive geometric conditions.
3

Examining the Effects of Key Point Detector and Descriptors on 3D Visual SLAM

Murphy, Timothy Charles 27 April 2016 (has links)
No description available.
4

Rekonstrukce 3D modelu prostředí a lokalizace kamery / 3D Model Reconstruction and Camera Localization

Vahalík, Tomáš January 2014 (has links)
This thesis focuses on reconstruction of 3D environment model from a set of photographs followed by camera localization. It describes basic principles and techniques used to create environmental models and techniques for camera pose estimation from 2D camera points to 3D model points. It also examines the influence of parameters on the quality of reconstruction and the possibilities of localization. It compares the quality of the descriptors in the process of creation of the model and based on localization it allows to implement augmented reality.
5

Pořizování vysoce kvalitních snímků rovinných povrchů chytrým telefonem / Capturing Very High Quality Images of Planar Surfaces by a Smartphone

Masaryk, Adam January 2021 (has links)
The aim of this thesis is to create a mobile application for Android, which allows users to create high-quality photos of planar objects. User can create multiple photographs of a selected planar object. These photographs are then aligned and combined into one final image. Various shortcomings that can be present in the photographs are filtered.
6

Pose Classification of Horse Behavior in Video : A deep learning approach for classifying equine poses based on 2D keypoints / Pose-klassificering av Hästbeteende i Video : En djupinlärningsmetod för klassificering av hästposer baserat på 2D-nyckelpunkter

Söderström, Michaela January 2021 (has links)
This thesis investigates whether Computer Vision can be a useful tool in interpreting the behaviors of monitored horses. In recent years, research in the field of Computer Vision has primarily focused on people, where pose estimation and action recognition are popular research areas. The thesis presents a pose classification network, where input features are described by estimated 2D key- points of horse body parts. The network output classifies three poses: ’Head above the wither’, ’Head aligned with the wither’ and ’Head below the wither’. The 2D reconstructions of keypoints are obtained using DeepLabCut applied to raw video surveillance data of a single horse. The estimated keypoints are then fed into a Multi-layer preceptron, which is trained to classify the mentioned classes. The network shows promising results with good performance. We found label noise when we spot-checked random samples of predicted poses and comparing them to the ground truth, as some of the labeled data consisted of false ground truth samples. Despite this fact, the conclusion is that satisfactory results are achieved with our method. Particularly, the keypoint estimates were sufficient enough for these poses for the model to succeed to classify a hold-out set of poses. / Uppsatsen undersöker främst om datorseende kan vara ett användbart verktyg för att tolka beteendet hos övervakade hästar. Under de senaste åren har forskning inom datorseende främst fokuserat på människor, där pose-estimering och händelseigenkänning är populära forskningsområden. Denna avhandling presenterar ett poseklassificeringsnätverk där indata beskrivs av uppskattade 2Dnyckelpunkter (eller så kallade intressepunkter) för hästkroppsdelar. Nätverket klassificerar tre poser: ’Huvud ovanför manken’, ’Huvud i linje med manken’ och ’Huvudet nedanför manken’. 2D-rekonstruktioner av nyckelpunkter erhålls med hjälp av DeepLabCut, applicerad på rå videoövervakningsdata för en häst. De uppskattade nyckelpunkterna matas sedan in i ett flerskikts- preceptron, som tränas för att klassificera de nämnda klasserna. Nätverket visar lovande resultat med bra prestanda. Vi hittade brus i etiketterna vid slumpmässiga stickprover av förutspådda poser som jämfördes med sanna etiketter där några etiketter bestod av falska sanna etiketter. Trots detta är slutsatsen att tillfredsställande resultat uppnås med vår metod. Speciellt var de estimerade nyckelpunkterna tillräckliga för dessa poser för att nätverket skulle lyckas med att klassificera ett separat dataset av samma osedda poser.

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