Search Results for author: Jenni Raitoharju

Found 44 papers, 12 papers with code

On Feature Diversity in Energy-based Models

no code implementations ICLR Workshop EBM 2021 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

Energy-based learning is a powerful learning paradigm that encapsulates various discriminative and generative approaches.

Generalization Bounds regression

WLD-Reg: A Data-dependent Within-layer Diversity Regularizer

no code implementations3 Jan 2023 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

At each optimization step, neurons at a given layer receive feedback from neurons belonging to higher layers of the hierarchy.

1st Workshop on Maritime Computer Vision (MaCVi) 2023: Challenge Results

no code implementations24 Nov 2022 Benjamin Kiefer, Matej Kristan, Janez Perš, Lojze Žust, Fabio Poiesi, Fabio Augusto de Alcantara Andrade, Alexandre Bernardino, Matthew Dawkins, Jenni Raitoharju, Yitong Quan, Adem Atmaca, Timon Höfer, Qiming Zhang, Yufei Xu, Jing Zhang, DaCheng Tao, Lars Sommer, Raphael Spraul, Hangyue Zhao, Hongpu Zhang, Yanyun Zhao, Jan Lukas Augustin, Eui-ik Jeon, Impyeong Lee, Luca Zedda, Andrea Loddo, Cecilia Di Ruberto, Sagar Verma, Siddharth Gupta, Shishir Muralidhara, Niharika Hegde, Daitao Xing, Nikolaos Evangeliou, Anthony Tzes, Vojtěch Bartl, Jakub Špaňhel, Adam Herout, Neelanjan Bhowmik, Toby P. Breckon, Shivanand Kundargi, Tejas Anvekar, Chaitra Desai, Ramesh Ashok Tabib, Uma Mudengudi, Arpita Vats, Yang song, Delong Liu, Yonglin Li, Shuman Li, Chenhao Tan, Long Lan, Vladimir Somers, Christophe De Vleeschouwer, Alexandre Alahi, Hsiang-Wei Huang, Cheng-Yen Yang, Jenq-Neng Hwang, Pyong-Kun Kim, Kwangju Kim, Kyoungoh Lee, Shuai Jiang, Haiwen Li, Zheng Ziqiang, Tuan-Anh Vu, Hai Nguyen-Truong, Sai-Kit Yeung, Zhuang Jia, Sophia Yang, Chih-Chung Hsu, Xiu-Yu Hou, Yu-An Jhang, Simon Yang, Mau-Tsuen Yang

The 1$^{\text{st}}$ Workshop on Maritime Computer Vision (MaCVi) 2023 focused on maritime computer vision for Unmanned Aerial Vehicles (UAV) and Unmanned Surface Vehicle (USV), and organized several subchallenges in this domain: (i) UAV-based Maritime Object Detection, (ii) UAV-based Maritime Object Tracking, (iii) USV-based Maritime Obstacle Segmentation and (iv) USV-based Maritime Obstacle Detection.

Object object-detection +2

Computer Vision on X-ray Data in Industrial Production and Security Applications: A Comprehensive Survey

no code implementations10 Nov 2022 Mehdi Rafiei, Jenni Raitoharju, Alexandros Iosifidis

X-ray imaging technology has been used for decades in clinical tasks to reveal the internal condition of different organs, and in recent years, it has become more common in other areas such as industry, security, and geography.

Anomaly Detection

Habitat classification from satellite observations with sparse annotations

no code implementations26 Sep 2022 Mikko Impiö, Pekka Härmä, Anna Tammilehto, Saku Anttila, Jenni Raitoharju

Therefore, full segmentation maps are expensive to produce, and training data is often sparse, point-like, and limited to areas accessible by foot.

Classification Land Cover Classification +2

Efficient CNN with uncorrelated Bag of Features pooling

no code implementations22 Sep 2022 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

In this paper, we propose an approach that builds on top of BoF pooling to boost its efficiency by ensuring that the items of the learned dictionary are non-redundant.

Generalized Reference Kernel for One-class Classification

1 code implementation1 May 2022 Jenni Raitoharju, Alexandros Iosifidis

Focusing on small-scale one-class classification, our analysis and experimental results show that the new formulation provides approaches to regularize, adjust the rank, and incorporate additional information into the kernel itself, leading to improved one-class classification accuracy.

Classification One-Class Classification

Automatic Image Content Extraction: Operationalizing Machine Learning in Humanistic Photographic Studies of Large Visual Archives

no code implementations5 Apr 2022 Anssi Männistö, Mert Seker, Alexandros Iosifidis, Jenni Raitoharju

Applying machine learning tools to digitized image archives has a potential to revolutionize quantitative research of visual studies in humanities and social sciences.

BIG-bench Machine Learning

Non-Linear Spectral Dimensionality Reduction Under Uncertainty

no code implementations9 Feb 2022 Firas Laakom, Jenni Raitoharju, Nikolaos Passalis, Alexandros Iosifidis, Moncef Gabbouj

In this paper, we consider the problem of non-linear dimensionality reduction under uncertainty, both from a theoretical and algorithmic perspectives.

Dimensionality Reduction

Reducing Redundancy in the Bottleneck Representation of the Autoencoders

no code implementations9 Feb 2022 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

We tested our approach across different tasks: dimensionality reduction using three different dataset, image compression using the MNIST dataset, and image denoising using fashion MNIST.

Dimensionality Reduction Image Compression +1

Robust channel-wise illumination estimation

1 code implementation10 Nov 2021 Firas Laakom, Jenni Raitoharju, Jarno Nikkanen, Alexandros Iosifidis, Moncef Gabbouj

We test this approach on the proposed method and show that it can indeed be used to avoid several extreme error cases and, thus, improves the practicality of the proposed technique.

Color Constancy

Learning to ignore: rethinking attention in CNNs

1 code implementation10 Nov 2021 Firas Laakom, Kateryna Chumachenko, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

Based on this idea, we propose to reformulate the attention mechanism in CNNs to learn to ignore instead of learning to attend.

Improving Neural Network Generalization via Promoting Within-Layer Diversity

no code implementations29 Sep 2021 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

Neural networks are composed of multiple layers arranged in a hierarchical structure jointly trained with a gradient-based optimization, where the errors are back-propagated from the last layer back to the first one.

Automatic Main Character Recognition for Photographic Studies

no code implementations16 Jun 2021 Mert Seker, Anssi Männistö, Alexandros Iosifidis, Jenni Raitoharju

Identifying the main character in images plays an important role in traditional photographic studies and media analysis, but the task is performed manually and can be slow and laborious.

Binary Classification Pose Estimation

Learning distinct features helps, provably

no code implementations10 Jun 2021 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

We study the diversity of the features learned by a two-layer neural network trained with the least squares loss.

Generalization Bounds

Automatic Social Distance Estimation From Images: Performance Evaluation, Test Benchmark, and Algorithm

1 code implementation11 Mar 2021 Mert Seker, Anssi Männistö, Alexandros Iosifidis, Jenni Raitoharju

The World Health Organization (WHO) has provided guidelines on how to reduce the spread of the virus and one of the most important measures is social distancing.

Human Detection object-detection +2

Ensembling object detectors for image and video data analysis

no code implementations9 Feb 2021 Kateryna Chumachenko, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

In this paper, we propose a method for ensembling the outputs of multiple object detectors for improving detection performance and precision of bounding boxes on image data.

Object object-detection +1

ON NEURAL NETWORK GENERALIZATION VIA PROMOTING WITHIN-LAYER ACTIVATION DIVERSITY

no code implementations1 Jan 2021 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

During the last decade, neural networks have been intensively used to tackle various problems and they have often led to state-of-the-art results.

Graph Embedding with Data Uncertainty

no code implementations1 Sep 2020 Firas Laakom, Jenni Raitoharju, Nikolaos Passalis, Alexandros Iosifidis, Moncef Gabbouj

spectral-based subspace learning is a common data preprocessing step in many machine learning pipelines.

Graph Embedding

Probabilistic Color Constancy

no code implementations6 May 2020 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Uygar Tuna, Jarno Nikkanen, Moncef Gabbouj

In this paper, we propose a novel unsupervised color constancy method, called Probabilistic Color Constancy (PCC).

Color Constancy

Saliency-based Weighted Multi-label Linear Discriminant Analysis

no code implementations8 Apr 2020 Lei Xu, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

The proposed method is based on a probabilistic model for defining the weights of individual samples in a weighted multi-label LDA approach.

Classification General Classification +1

Not all domains are equally complex: Adaptive Multi-Domain Learning

no code implementations25 Mar 2020 Ali Senhaji, Jenni Raitoharju, Moncef Gabbouj, Alexandros Iosifidis

The most common approach in multi-domain learning is to form a domain agnostic model, the parameters of which are shared among all domains, and learn a small number of extra domain-specific parameters for each individual new domain.

Ellipsoidal Subspace Support Vector Data Description

1 code implementation20 Mar 2020 Fahad Sohrab, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

In this paper, we propose a novel method for transforming data into a low-dimensional space optimized for one-class classification.

General Classification One-Class Classification

Boosting rare benthic macroinvertebrates taxa identification with one-class classification

no code implementations12 Feb 2020 Fahad Sohrab, Jenni Raitoharju

One-class classification models are traditionally trained with much fewer samples and they can provide a mechanism to indicate samples potentially belonging to the rare classes for human inspection.

Classification General Classification +1

Incremental Fast Subclass Discriminant Analysis

no code implementations11 Feb 2020 Kateryna Chumachenko, Jenni Raitoharju, Moncef Gabbouj, Alexandros Iosifidis

This paper proposes an incremental solution to Fast Subclass Discriminant Analysis (fastSDA).

Neural Architecture Search by Estimation of Network Structure Distributions

no code implementations19 Aug 2019 Anton Muravev, Jenni Raitoharju, Moncef Gabbouj

Our matrix of probabilities is equivalent to the population of models, but allows for discovery of structural irregularities, while being simple to interpret and analyze.

Neural Architecture Search

Null Space Analysis for Class-Specific Discriminant Learning

no code implementations13 Aug 2019 Jenni Raitoharju, Alexandros Iosifidis

In this paper, we carry out null space analysis for Class-Specific Discriminant Analysis (CSDA) and formulate a number of solutions based on the analysis.

Dimensionality Reduction

Reversible Privacy Preservation using Multi-level Encryption and Compressive Sensing

no code implementations20 Jun 2019 Mehmet Yamac, Mete Ahishali, Nikolaos Passalis, Jenni Raitoharju, Bulent Sankur, Moncef Gabbouj

Security monitoring via ubiquitous cameras and their more extended in intelligent buildings stand to gain from advances in signal processing and machine learning.

Compressive Sensing De-identification +1

Bag of Color Features For Color Constancy

1 code implementation11 Jun 2019 Firas Laakom, Nikolaos Passalis, Jenni Raitoharju, Jarno Nikkanen, Anastasios Tefas, Alexandros Iosifidis, Moncef Gabbouj

To further improve the illumination estimation accuracy, we propose a novel attention mechanism for the BoCF model with two variants based on self-attention.

Color Constancy

Color Constancy Convolutional Autoencoder

no code implementations4 Jun 2019 Firas Laakom, Jenni Raitoharju, Alexandros Iosifidis, Jarno Nikkanen, Moncef Gabbouj

In this paper, we study the importance of pre-training for the generalization capability in the color constancy problem.

Color Constancy Unsupervised Pre-training

Speed-up and multi-view extensions to Subclass Discriminant Analysis

1 code implementation2 May 2019 Kateryna Chumachenko, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

We show that by exploiting the structure of the between-class Laplacian matrix, the eigendecomposition step can be substituted with a much faster process.

Graph Embedding regression

Machine Learning Based Analysis of Finnish World War II Photographers

1 code implementation22 Apr 2019 Kateryna Chumachenko, Anssi Männistö, Alexandros Iosifidis, Jenni Raitoharju

In this paper, we demonstrate the benefits of using state-of-the-art machine learning methods in the analysis of historical photo archives.

BIG-bench Machine Learning

Multimodal Subspace Support Vector Data Description

1 code implementation16 Apr 2019 Fahad Sohrab, Jenni Raitoharju, Alexandros Iosifidis, Moncef Gabbouj

In this paper, we propose a novel method for projecting data from multiple modalities to a new subspace optimized for one-class classification.

General Classification One-Class Classification

Subspace Support Vector Data Description

1 code implementation12 Feb 2018 Fahad Sohrab, Jenni Raitoharju, Moncef Gabbouj, Alexandros Iosifidis

The method iteratively optimizes the data mapping along with data description in order to define a compact class representation in a low-dimensional feature space.

Classification General Classification +1

Human experts vs. machines in taxa recognition

no code implementations23 Aug 2017 Johanna Ärje, Jenni Raitoharju, Alexandros Iosifidis, Ville Tirronen, Kristian Meissner, Moncef Gabbouj, Serkan Kiranyaz, Salme Kärkkäinen

Contrary to previous findings in the literature, we find that for machines following a typical flat classification approach commonly used in machine learning performs better than forcing machines to adopt a hierarchical, local per parent node approach used by human taxonomic experts ($\overline{CE}=13. 8\%$).

BIG-bench Machine Learning General Classification +1

Limited Random Walk Algorithm for Big Graph Data Clustering

no code implementations21 Jun 2016 Honglei Zhang, Jenni Raitoharju, Serkan Kiranyaz, Moncef Gabbouj

Graph clustering is an important technique to understand the relationships between the vertices in a big graph.

Social and Information Networks Physics and Society

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