Search Results for author: Marius Leordeanu

Found 42 papers, 9 papers with code

Multiple Random Masking Autoencoder Ensembles for Robust Multimodal Semi-supervised Learning

no code implementations12 Feb 2024 Alexandru-Raul Todoran, Marius Leordeanu

There is an increasing number of real-world problems in computer vision and machine learning requiring to take into consideration multiple interpretation layers (modalities or views) of the world and learn how they relate to each other.

Maia: A Real-time Non-Verbal Chat for Human-AI Interaction

no code implementations9 Feb 2024 Dragos Costea, Alina Marcu, Cristina Lazar, Marius Leordeanu

Our goal is to track and analyze facial expressions, and other non-verbal cues in real-time, and use this information to build models that can predict and understand human behavior.

Retrieval

JEDI: Joint Expert Distillation in a Semi-Supervised Multi-Dataset Student-Teacher Scenario for Video Action Recognition

no code implementations9 Aug 2023 Lucian Bicsi, Bogdan Alexe, Radu Tudor Ionescu, Marius Leordeanu

We propose JEDI, a multi-dataset semi-supervised learning method, which efficiently combines knowledge from multiple experts, learned on different datasets, to train and improve the performance of individual, per dataset, student models.

Action Recognition Temporal Action Localization

Self-supervised novel 2D view synthesis of large-scale scenes with efficient multi-scale voxel carving

no code implementations26 Jun 2023 Alexandra Budisteanu, Dragos Costea, Alina Marcu, Marius Leordeanu

First, we manage to stay anchored in the real 3D world, by introducing an efficient multi-scale voxel carving method, which is able to accommodate significant noises in pose, depth, and illumination variations, while being able to reconstruct the view of the world from drastically different poses at test time.

Novel View Synthesis

GEST: the Graph of Events in Space and Time as a Common Representation between Vision and Language

no code implementations22 May 2023 Mihai Masala, Nicolae Cudlenco, Traian Rebedea, Marius Leordeanu

GEST alows us to measure the similarity between texts and videos in a semantic and fully explainable way, through graph matching.

Graph Matching Text Generation

Learning a Fast 3D Spectral Approach to Object Segmentation and Tracking over Space and Time

no code implementations15 Dec 2022 Elena Burceanu, Marius Leordeanu

Our motivation for a spectral space-time clustering approach, unique in video semantic segmentation literature, is that such clustering is dedicated to preserving object consistency over time, which we evaluate using our novel segmentation consistency measure.

Clustering Graph Clustering +7

TEACHTEXT: CrossModal Generalized Distillation for Text-Video Retrieval

1 code implementation ICCV 2021 Ioana Croitoru, Simion-Vlad Bogolin, Marius Leordeanu, Hailin Jin, Andrew Zisserman, Samuel Albanie, Yang Liu

In recent years, considerable progress on the task of text-video retrieval has been achieved by leveraging large-scale pretraining on visual and audio datasets to construct powerful video encoders.

Retrieval Video Retrieval

Self-Supervised Learning in Multi-Task Graphs through Iterative Consensus Shift

1 code implementation26 Mar 2021 Emanuela Haller, Elena Burceanu, Marius Leordeanu

The human ability to synchronize the feedback from all their senses inspired recent works in multi-task and multi-modal learning.

Multi-Task Learning Self-Supervised Learning +1

Iterative Knowledge Exchange Between Deep Learning and Space-Time Spectral Clustering for Unsupervised Segmentation in Videos

no code implementations13 Dec 2020 Emanuela Haller, Adina Magda Florea, Marius Leordeanu

A novel spectral space-time clustering process on the graph produces unsupervised segmentation masks passed to the network as pseudo-labels.

Clustering Object +3

Semantics through Time: Semi-supervised Segmentation of Aerial Videos with Iterative Label Propagation

2 code implementations2 Oct 2020 Alina Marcu, Vlad Licaret, Dragos Costea, Marius Leordeanu

Motivated by the lack of a large video aerial dataset, we also introduce Ruralscapes, a new dataset with high resolution (4K) images and manually-annotated dense labels every 50 frames - the largest of its kind, to the best of our knowledge.

4k Clustering +2

Semi-Supervised Learning for Multi-Task Scene Understanding by Neural Graph Consensus

3 code implementations2 Oct 2020 Marius Leordeanu, Mihai Pirvu, Dragos Costea, Alina Marcu, Emil Slusanschi, Rahul Sukthankar

The unsupervised learning process is repeated over several generations, in which each edge becomes a "student" and also part of different ensemble "teachers" for training other students.

Scene Understanding Semantic Segmentation

Discovering Dynamic Salient Regions for Spatio-Temporal Graph Neural Networks

1 code implementation NeurIPS 2021 Iulia Duta, Andrei Nicolicioiu, Marius Leordeanu

Graph Neural Networks are perfectly suited to capture latent interactions between various entities in the spatio-temporal domain (e. g. videos).

Inductive Bias Object +1

A regime switching on Covid19 analysis and prediction in Romania

no code implementations27 Jul 2020 Marian Petrica, Radu D. Stochitoiu, Marius Leordeanu, Ionel Popescu

The second issue is that there were many factors which affected the evolution of the pandemic.

A self-supervised neural-analytic method to predict the evolution of COVID-19 in Romania

no code implementations23 Jun 2020 Radu D. Stochiţoiu, Marian Petrica, Traian Rebedea, Ionel Popescu, Marius Leordeanu

More specifically, we want to statistically estimate all the relevant parameters for the new coronavirus COVID-19, such as the reproduction number, fatality rate or length of infectiousness period, based on Romanian patients, as well as be able to predict future outcomes.

In Search of Life: Learning from Synthetic Data to Detect Vital Signs in Videos

no code implementations16 Apr 2020 Florin Condrea, Victor-Andrei Ivan, Marius Leordeanu

Moreover, our system, which is trained in a purely automatic manner and needs no human annotation, also learns to predict the respiration or heart intensity signal for each moment in time and to detect the region of interest that is most relevant for the given task, e. g. the nose area in the case of respiration.

Image Difficulty Curriculum for Generative Adversarial Networks (CuGAN)

1 code implementation20 Oct 2019 Petru Soviany, Claudiu Ardei, Radu Tudor Ionescu, Marius Leordeanu

All strategies are first based on ranking the training images by their difficulty scores, which are estimated by a state-of-the-art image difficulty predictor.

Image Generation Translation

Learning Navigation by Visual Localization and Trajectory Prediction

no code implementations7 Oct 2019 Iulia Paraicu, Marius Leordeanu

Our system learns to predict in real-time vehicle's current location and future trajectory, as a function of time, on a known map, given only the raw video stream and the intended destination.

Navigate Trajectory Prediction +1

Spacetime Graph Optimization for Video Object Segmentation

no code implementations7 Jul 2019 Emanuela Haller, Adina Magda Florea, Marius Leordeanu

While the actual matrix is not computed explicitly, the proposed algorithm efficiently computes, in a few iteration steps, the principal eigenvector that captures the segmentation of the main object in the video.

Clustering Object +6

A 3D Convolutional Approach to Spectral Object Segmentation in Space and Time

1 code implementation5 Jul 2019 Elena Burceanu, Marius Leordeanu

Our method is based on the power iteration for finding the principal eigenvector of a matrix, which we prove is equivalent to performing a specific set of 3D convolutions in the space-time feature volume.

Clustering graph partitioning +3

Recurrent Space-time Graph Neural Networks

1 code implementation NeurIPS 2019 Andrei Nicolicioiu, Iulia Duta, Marius Leordeanu

Our model is general and could learn to recognize a variety of high level spatio-temporal concepts and be applied to different learning tasks.

Ranked #58 on Action Recognition on Something-Something V1 (using extra training data)

Action Recognition Human-Object Interaction Detection +1

Unsupervised learning of foreground object detection

no code implementations14 Aug 2018 Ioana Croitoru, Simion-Vlad Bogolin, Marius Leordeanu

We train a student deep network to predict the output of a teacher pathway that performs unsupervised object discovery in videos or large image collections.

Image Segmentation Object +7

Mining for meaning: from vision to language through multiple networks consensus

no code implementations5 Jun 2018 Iulia Duta, Andrei Liviu Nicolicioiu, Simion-Vlad Bogolin, Marius Leordeanu

Here we propose an approach to describe videos in natural language by reaching a consensus among multiple encoder-decoder networks.

Learning a Robust Society of Tracking Parts using Co-occurrence Constraints

no code implementations5 Apr 2018 Elena Burceanu, Marius Leordeanu

We address this challenge by proposing a deep neural network composed of different parts, which functions as a society of tracking parts.

Object Tracking

A Multi-Stage Multi-Task Neural Network for Aerial Scene Interpretation and Geolocalization

no code implementations4 Apr 2018 Alina Marcu, Dragos Costea, Emil Slusanschi, Marius Leordeanu

The first stage of our network predicts pixelwise class labels, while the second stage provides a precise location using two branches.

Segmentation Semantic Segmentation

Learning a Robust Society of Tracking Parts

no code implementations26 May 2017 Elena Burceanu, Marius Leordeanu

They are classifiers that respond at different scales and locations.

Object Tracking

Unsupervised object segmentation in video by efficient selection of highly probable positive features

no code implementations ICCV 2017 Emanuela Haller, Marius Leordeanu

We also present theoretical properties of our unsupervised learning method, that under some mild constraints is guaranteed to learn a correct discriminative classifier even in the unsupervised case.

Object Semantic Segmentation +1

Unsupervised learning from video to detect foreground objects in single images

no code implementations ICCV 2017 Ioana Croitoru, Simion-Vlad Bogolin, Marius Leordeanu

Our approach is different from the published literature that performs unsupervised discovery in videos or in collections of images at test time.

Object Discovery

Aerial image geolocalization from recognition and matching of roads and intersections

no code implementations26 May 2016 Dragos Costea, Marius Leordeanu

We offer a complete pipeline for geolocalization, from the detection of roads and intersections, to the identification of the enclosing geographic region by matching detected intersections to previously learned manually labeled ones, followed by accurate geometric alignment between the detected roads and the manually labeled maps.

Dual Local-Global Contextual Pathways for Recognition in Aerial Imagery

no code implementations18 May 2016 Alina Marcu, Marius Leordeanu

Our model learns to combine local object appearance as well as information from the larger scene at the same time and in a complementary way, such that together they form a powerful classifier.

Object Recognition Road Segmentation +1

Features in Concert: Discriminative Feature Selection meets Unsupervised Clustering

no code implementations27 Nov 2014 Marius Leordeanu, Alexandra Radu, Rahul Sukthankar

Feature selection is an essential problem in computer vision, important for category learning and recognition.

Clustering feature selection

Thoughts on a Recursive Classifier Graph: a Multiclass Network for Deep Object Recognition

no code implementations2 Apr 2014 Marius Leordeanu, Rahul Sukthankar

In this manner we can learn and grow both a deep, complex graph of classifiers and a rich pool of features at different levels of abstraction and interpretation.

Object Recognition

An Integer Projected Fixed Point Method for Graph Matching and MAP Inference

no code implementations NeurIPS 2009 Marius Leordeanu, Martial Hebert, Rahul Sukthankar

When applied to MAP inference, the algorithm is a parallel extension of Iterated Conditional Modes (ICM) with climbing and convergence properties that make it a compelling alternative to the sequential ICM.

Graph Matching

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