Essays about: "Inverse projection"

Found 5 essays containing the words Inverse projection.

1. 1. Limited angle reconstruction for 2D CT based on machine learning

   University essay from KTH/Skolan för teknikvetenskap (SCI)

   Author : Eric Oldgren; Knut Salomonsson; [2023]
   Keywords : CT; computed tomography; limited angle; machine learning; limited data; ill posed problem; inverse problem;

   Abstract : The aim of this report is to study how machine learning can be used to reconstruct 2 dimensional computed tomography images from limited angle data. This could be used in a variety of applications where either the space or timeavailable for the CT scan limits the acquired data.In this study, three different types of models are considered. READ MORE

3. 2. Towards topology-aware Variational Auto-Encoders : from InvMap-VAE to Witness Simplicial VAE

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Aniss Aiman Medbouhi; [2022]
   Keywords : Variational Auto-Encoder; Nonlinear dimensionality reduction; Generative model; Inverse projection; Computational topology; Algorithmic topology; Topological Data Analysis; Data visualisation; Unsupervised representation learning; Topological machine learning; Betti number; Simplicial complex; Witness complex; Simplicial map; Simplicial regularization.; Variations autokodare; Ickelinjär dimensionalitetsreducering; Generativ modell; Invers projektion; Beräkningstopologi; Algoritmisk topologi; Topologisk Data Analys; Datavisualisering; Oövervakat representationsinlärning; Topologisk maskininlärning; Betti-nummer; Simplicielt komplex; Vittneskomplex; Simpliciel avbildning; Simpliciel regularisering.;

   Abstract : Variational Auto-Encoders (VAEs) are one of the most famous deep generative models. After showing that standard VAEs may not preserve the topology, that is the shape of the data, between the input and the latent space, we tried to modify them so that the topology is preserved. READ MORE

4. 3. Image Reconstruction Techniques using Kaiser Window in 2D CT Imaging

   University essay from Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

   Author : Md Monowarul Islam; Muftadi Ullah Arpon; [2020]
   Keywords : CT Imaging; Parallel-Beam Projection; 2D FFT; Radon Transform; Filters; Window Functions; Kaiser window; Inverse Fourier Transform; FBP.;

   Abstract : The traditional Computed Tomography (CT) is based on the Radon Transform and its inversion. The Radon transform uses parallel beam geometry and its inversion is based on the Fourier slice theorem. READ MORE

5. 4. Periodic Motion Extraction Using Harmonic Regression and Structural Parameterization

   University essay from KTH/Skolan för datavetenskap och kommunikation (CSC)

   Author : Magnus Raunio; [2014]
   Keywords : ;

   Abstract : The work of this thesis focuses on how to construct a smooth and periodic motion from motion capture data of a motion with a periodic structure, such as walk cycles. To identify periodic structures in the motion capture data we rely on previously developed methods from algebraic topology to project each frame of the motion capture data onto a circle. READ MORE

6. 5. Visual Servoing Based on Learned Inverse Kinematics

   University essay from Institutionen för systemteknik

   Author : Fredrik Larsson; [2007]
   Keywords : Visual servoing; machine learning; lwpr;

   Abstract : Initially an analytical closed-form inverse kinematics solution for a 5 DOF robotic arm was developed and implemented. This analytical solution proved not to meet the accuracy required for the shape sorting puzzle setup used in the COSPAL (COgnitiveSystems using Perception-Action Learning) project [2]. READ MORE