Search Results for author: Nikolaos Zioulis

Found 25 papers, 13 papers with code

BundleMoCap: Efficient, Robust and Smooth Motion Capture from Sparse Multiview Videos

no code implementations21 Nov 2023 Georgios Albanis, Nikolaos Zioulis, Kostas Kolomvatsos

It solves the motion capture task in a single stage, eliminating the need for temporal smoothness objectives while still delivering smooth motions.

3D human pose and shape estimation Markerless Motion Capture

Noise-in, Bias-out: Balanced and Real-time MoCap Solving

no code implementations25 Sep 2023 Georgios Albanis, Nikolaos Zioulis, Spyridon Thermos, Anargyros Chatzitofis, Kostas Kolomvatsos

By relying on a unified representation, we show that training such a model is not bound to high-end MoCap training data acquisition, and exploit the advances in marker-less MoCap to acquire the necessary data.

Representation Learning

KBody: Towards general, robust, and aligned monocular whole-body estimation

no code implementations23 Apr 2023 Nikolaos Zioulis, James F. O'Brien

It follows a predict-and-optimize approach, relying on data-driven model estimates for the constraints that will be used to solve for the body's parameters.

Hybrid Skip: A Biologically Inspired Skip Connection for the UNet Architecture

no code implementations11 Jul 2022 Nikolaos Zioulis, Georgios Albanis, Petros Drakoulis, Federico Alvarez, Dimitrios Zarpalas, Petros Daras

In this work we introduce a biologically inspired long-range skip connection for the UNet architecture that relies on the perceptual illusion of hybrid images, being images that simultaneously encode two images.

Depth Estimation

A Low-Cost & Real-Time Motion Capture System

no code implementations CVPR 2022 Anargyros Chatzitofis, Georgios Albanis, Nikolaos Zioulis, Spyridon Thermos

Traditional marker-based motion capture requires excessive and specialized equipment, hindering accessibility and wider adoption.

Denoising

Towards Full-to-Empty Room Generation with Structure-Aware Feature Encoding and Soft Semantic Region-Adaptive Normalization

no code implementations10 Dec 2021 Vasileios Gkitsas, Nikolaos Zioulis, Vladimiros Sterzentsenko, Alexandros Doumanoglou, Dimitrios Zarpalas

In order to acquire photo-realistic and structural consistent background, existing deep learning methods either employ image inpainting approaches or incorporate the learning of the scene layout as an individual task and leverage it later in a not fully differentiable semantic region-adaptive normalization module.

Depth Estimation Image Inpainting

On Coordinate Decoding for Keypoint Estimation Tasks

no code implementations19 Oct 2021 Anargyros Chatzitofis, Nikolaos Zioulis, Georgios Nikolaos Albanis, Dimitrios Zarpalas, Petros Daras

A series of 2D (and 3D) keypoint estimation tasks are built upon heatmap coordinate representation, i. e. a probability map that allows for learnable and spatially aware encoding and decoding of keypoint coordinates on grids, even allowing for sub-pixel coordinate accuracy.

Keypoint Estimation

Serverless Streaming for Emerging Media: Towards 5G Network-Driven Cost Optimization

no code implementations9 Feb 2021 Konstantinos Konstantoudakis, David Breitgand, Alexandros Doumanoglou, Nikolaos Zioulis, Avi Weit, Kyriaki Christaki, Petros Drakoulis, Emmanouil Christakis, Dimitrios Zarpalas, Petros Daras

Immersive 3D media is an emerging type of media that captures, encodes and reconstructs the 3D appearance of people and objects, with applications in tele-presence, teleconference, entertainment, gaming and other fields.

Networking and Internet Architecture Multimedia

SHREC 2020 track: 6D Object Pose Estimation

no code implementations19 Oct 2020 Honglin Yuan, Remco C. Veltkamp, Georgios Albanis, Nikolaos Zioulis, Dimitrios Zarpalas, Petros Daras

From captured color and depth images, we use this simulator to generate a 3D dataset which has 400 photo-realistic synthesized color-and-depth image pairs with various view angles for training, and another 100 captured and synthetic images for testing.

6D Pose Estimation 6D Pose Estimation using RGB +3

DronePose: Photorealistic UAV-Assistant Dataset Synthesis for 3D Pose Estimation via a Smooth Silhouette Loss

2 code implementations20 Aug 2020 Georgios Albanis, Nikolaos Zioulis, Anastasios Dimou, Dimitrios Zarpalas, Petros Daras

In this context, the 3D localisation of the UAV assistant is an important task that can facilitate the exchange of spatial information between the user and the UAV.

3D Pose Estimation Drone Pose Estimation

Deep Lighting Environment Map Estimation from Spherical Panoramas

1 code implementation16 May 2020 Vasileios Gkitsas, Nikolaos Zioulis, Federico Alvarez, Dimitrios Zarpalas, Petros Daras

We approach this problem differently, exploiting the availability of surface geometry to employ image-based relighting as a data generator and supervision mechanism.

Lighting Estimation Mixed Reality

Deep Soft Procrustes for Markerless Volumetric Sensor Alignment

2 code implementations23 Mar 2020 Vladimiros Sterzentsenko, Alexandros Doumanoglou, Spyridon Thermos, Nikolaos Zioulis, Dimitrios Zarpalas, Petros Daras

This is accomplished by a soft, differentiable procrustes analysis that regularizes the segmentation and achieves higher extrinsic calibration performance in expanded sensor placement configurations, while being unrestricted by the number of sensors of the volumetric capture system.

Pose Estimation

Restyling Data: Application to Unsupervised Domain Adaptation

no code implementations24 Sep 2019 Vasileios Gkitsas, Antonis Karakottas, Nikolaos Zioulis, Dimitrios Zarpalas, Petros Daras

Machine learning is driven by data, yet while their availability is constantly increasing, training data require laborious, time consuming and error-prone labelling or ground truth acquisition, which in some cases is very difficult or even impossible.

Style Transfer Synthetic Data Generation +1

Spherical View Synthesis for Self-Supervised 360 Depth Estimation

2 code implementations17 Sep 2019 Nikolaos Zioulis, Antonis Karakottas, Dimitrios Zarpalas, Federico Alvarez, Petros Daras

This has led to the utilization of view synthesis as an indirect objective for learning depth estimation using efficient data acquisition procedures.

3D Depth Estimation

$360^o$ Surface Regression with a Hyper-Sphere Loss

2 code implementations16 Sep 2019 Antonis Karakottas, Nikolaos Zioulis, Stamatis Samaras, Dimitrios Ataloglou, Vasileios Gkitsas, Dimitrios Zarpalas, Petros Daras

We present a dataset of $360^o$ images of indoor spaces with their corresponding ground truth surface normal, and train a deep convolutional neural network (CNN) on the task of monocular 360 surface estimation.

regression Surface Normals Estimation

Self-Supervised Deep Depth Denoising

1 code implementation ICCV 2019 Vladimiros Sterzentsenko, Leonidas Saroglou, Anargyros Chatzitofis, Spyridon Thermos, Nikolaos Zioulis, Alexandros Doumanoglou, Dimitrios Zarpalas, Petros Daras

Specifically, the proposed autoencoder exploits multiple views of the same scene from different points of view in order to learn to suppress noise in a self-supervised end-to-end manner using depth and color information during training, yet only depth during inference.

3D Reconstruction Denoising

OmniDepth: Dense Depth Estimation for Indoors Spherical Panoramas

1 code implementation ECCV 2018 Nikolaos Zioulis, Antonis Karakottas, Dimitrios Zarpalas, Petros Daras

Recent work on depth estimation up to now has only focused on projective images ignoring 360 content which is now increasingly and more easily produced.

Monocular Depth Estimation

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