Search Results for author: Christos Koutlis

Found 16 papers, 10 papers with code

Leveraging Representations from Intermediate Encoder-blocks for Synthetic Image Detection

no code implementations29 Feb 2024 Christos Koutlis, Symeon Papadopoulos

The recently developed and publicly available synthetic image generation methods and services make it possible to create extremely realistic imagery on demand, raising great risks for the integrity and safety of online information.

Image Generation Synthetic Image Detection

RED-DOT: Multimodal Fact-checking via Relevant Evidence Detection

1 code implementation16 Nov 2023 Stefanos-Iordanis Papadopoulos, Christos Koutlis, Symeon Papadopoulos, Panagiotis C. Petrantonakis

Online misinformation is often multimodal in nature, i. e., it is caused by misleading associations between texts and accompanying images.

Fact Checking Misinformation +1

FairBranch: Fairness Conflict Correction on Task-group Branches for Fair Multi-Task Learning

1 code implementation20 Oct 2023 Arjun Roy, Christos Koutlis, Symeon Papadopoulos, Eirini Ntoutsi

The generalization capacity of Multi-Task Learning (MTL) becomes limited when unrelated tasks negatively impact each other by updating shared parameters with conflicting gradients, resulting in negative transfer and a reduction in MTL accuracy compared to single-task learning (STL).

Fairness Multi-Task Learning

Towards Fair Face Verification: An In-depth Analysis of Demographic Biases

no code implementations19 Jul 2023 Ioannis Sarridis, Christos Koutlis, Symeon Papadopoulos, Christos Diou

This paper presents an in-depth analysis, with a particular emphasis on the intersectionality of these demographic factors.

Face Recognition Face Verification +2

FLAC: Fairness-Aware Representation Learning by Suppressing Attribute-Class Associations

1 code implementation27 Apr 2023 Ioannis Sarridis, Christos Koutlis, Symeon Papadopoulos, Christos Diou

To overcome these limitations, this work introduces FLAC, a methodology that minimizes mutual information between the features extracted by the model and a protected attribute, without the use of attribute labels.

Age/Bias-conflicting Age/Unbiased +13

VERITE: A Robust Benchmark for Multimodal Misinformation Detection Accounting for Unimodal Bias

2 code implementations27 Apr 2023 Stefanos-Iordanis Papadopoulos, Christos Koutlis, Symeon Papadopoulos, Panagiotis C. Petrantonakis

Multimedia content has become ubiquitous on social media platforms, leading to the rise of multimodal misinformation (MM) and the urgent need for effective strategies to detect and prevent its spread.

Misinformation

Synthetic Misinformers: Generating and Combating Multimodal Misinformation

1 code implementation2 Mar 2023 Stefanos-Iordanis Papadopoulos, Christos Koutlis, Symeon Papadopoulos, Panagiotis C. Petrantonakis

To address this, we perform a comparative study on existing and new Synthetic Misinformers that involves (1) out-of-context (OOC) image-caption pairs, (2) cross-modal named entity inconsistency (NEI) as well as (3) hybrid approaches and we evaluate them against real-world misinformation; using the COSMOS benchmark.

Misinformation

Design-time Fashion Popularity Forecasting in VR Environments

no code implementations14 Dec 2022 Stefanos-Iordanis Papadopoulos, Christos Koutlis, Anastasios Papazoglou-Chalikias, Symeon Papadopoulos, Spiros Nikolopoulos

To this end, we develop a computer vision pipeline fine tuned on fashion imagery in order to extract relevant visual features along with the category and attributes of the garment.

Image Classification Popularity Forecasting +1

Leveraging Large-scale Multimedia Datasets to Refine Content Moderation Models

no code implementations1 Dec 2022 Ioannis Sarridis, Christos Koutlis, Olga Papadopoulou, Symeon Papadopoulos

The sheer volume of online user-generated content has rendered content moderation technologies essential in order to protect digital platform audiences from content that may cause anxiety, worry, or concern.

VICTOR: Visual Incompatibility Detection with Transformers and Fashion-specific contrastive pre-training

1 code implementation27 Jul 2022 Stefanos-Iordanis Papadopoulos, Christos Koutlis, Symeon Papadopoulos, Ioannis Kompatsiaris

For fashion outfits to be considered aesthetically pleasing, the garments that constitute them need to be compatible in terms of visual aspects, such as style, category and color.

Binary Classification Recommendation Systems

MemeTector: Enforcing deep focus for meme detection

1 code implementation26 May 2022 Christos Koutlis, Manos Schinas, Symeon Papadopoulos

To this end, we propose a methodology, called Visual Part Utilization, that utilizes the visual part of image memes as instances of the regular image class and the initial image memes as instances of the image meme class to force the model to concentrate on the critical parts that characterize an image meme.

InDistill: Information flow-preserving knowledge distillation for model compression

1 code implementation20 May 2022 Ioannis Sarridis, Christos Koutlis, Giorgos Kordopatis-Zilos, Ioannis Kompatsiaris, Symeon Papadopoulos

In this paper we introduce InDistill, a model compression approach that combines knowledge distillation and channel pruning in a unified framework for the transfer of the critical information flow paths from a heavyweight teacher to a lightweight student.

Knowledge Distillation Model Compression

Multimodal Quasi-AutoRegression: Forecasting the visual popularity of new fashion products

no code implementations8 Apr 2022 Stefanos I. Papadopoulos, Christos Koutlis, Symeon Papadopoulos, Ioannis Kompatsiaris

We employ the product's target attributes time series as a proxy of temporal popularity patterns, mitigating the lack of historical data, while exogenous time series help capture trends among interrelated attributes.

Image Captioning Image Classification +4

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