Search Results for author: Christos Bergeles

Found 13 papers, 9 papers with code

Multi-scale and Cross-scale Contrastive Learning for Semantic Segmentation

1 code implementation25 Mar 2022 Theodoros Pissas, Claudio S. Ravasio, Lyndon Da Cruz, Christos Bergeles

We apply contrastive learning to enhance the discriminative power of the multi-scale features extracted by semantic segmentation networks.

Contrastive Learning Semantic Segmentation

Oflib: Facilitating Operations with and on Optical Flow Fields in Python

2 code implementations11 Oct 2022 Claudio Ravasio, Lyndon Da Cruz, Christos Bergeles

We present a robust theoretical framework for the characterisation and manipulation of optical flow, i. e 2D vector fields, in the context of their use in motion estimation algorithms and beyond.

Motion Estimation Optical Flow Estimation

Deep Homography Estimation in Dynamic Surgical Scenes for Laparoscopic Camera Motion Extraction

2 code implementations30 Sep 2021 Martin Huber, Sébastien Ourselin, Christos Bergeles, Tom Vercauteren

We perform an extensive evaluation of state-of-the-art (SOTA) Deep Neural Networks (DNNs) across multiple compute regimes, finding our method transfers from our camera motion free da Vinci surgery dataset to videos of laparoscopic interventions, outperforming classical homography estimation approaches in both, precision by 41%, and runtime on a CPU by 43%.

Homography Estimation Imitation Learning +1

Homography-based Visual Servoing with Remote Center of Motion for Semi-autonomous Robotic Endoscope Manipulation

1 code implementation25 Oct 2021 Martin Huber, John Bason Mitchell, Ross Henry, Sébastien Ourselin, Tom Vercauteren, Christos Bergeles

Our approach allows a surgeon to build a graph of desired views, from which, once built, views can be manually selected and automatically servoed to irrespective of robot-patient frame transformation changes.

Image Registration

Deep Homography Prediction for Endoscopic Camera Motion Imitation Learning

1 code implementation24 Jul 2023 Martin Huber, Sebastien Ourselin, Christos Bergeles, Tom Vercauteren

In this work, we investigate laparoscopic camera motion automation through imitation learning from retrospective videos of laparoscopic interventions.

Image Registration Imitation Learning

ROS-PyBullet Interface: A Framework for Reliable Contact Simulation and Human-Robot Interaction

no code implementations13 Oct 2022 Christopher E. Mower, Theodoros Stouraitis, João Moura, Christian Rauch, Lei Yan, Nazanin Zamani Behabadi, Michael Gienger, Tom Vercauteren, Christos Bergeles, Sethu Vijayakumar

However, there is a lack of software connecting reliable contact simulation with the larger robotics ecosystem (i. e. ROS, Orocos), for a more seamless application of novel approaches, found in the literature, to existing robotic hardware.

ArcSin: Adaptive ranged cosine Similarity injected noise for Language-Driven Visual Tasks

no code implementations27 Feb 2024 Yang Liu, Xiaomin Yu, Gongyu Zhang, Christos Bergeles, Prokar Dasgupta, Alejandro Granados, Sebastien Ourselin

We train models for these tasks in a zero-shot cross-modal transfer setting, a domain where the previous state-of-the-art method relied on the fixed scale noise injection, often compromising the semantic content of the original modality embedding.

Domain Generalization Image Captioning +3

RetiGen: A Framework for Generalized Retinal Diagnosis Using Multi-View Fundus Images

no code implementations22 Mar 2024 Ze Chen, Gongyu Zhang, Jiayu Huo, Joan Nunez do Rio, Charalampos Komninos, Yang Liu, Rachel Sparks, Sebastien Ourselin, Christos Bergeles, Timothy Jackson

This study introduces a novel framework for enhancing domain generalization in medical imaging, specifically focusing on utilizing unlabelled multi-view colour fundus photographs.

Domain Generalization Test-time Adaptation

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