Search Results for author: Dimosthenis Karatzas

Found 60 papers, 27 papers with code

Multimodal Transformer for Comics Text-Cloze

no code implementations6 Mar 2024 Emanuele Vivoli, Joan Lafuente Baeza, Ernest Valveny Llobet, Dimosthenis Karatzas

This work explores a closure task in comics, a medium where visual and textual elements are intricately intertwined.

Language Modelling Large Language Model +1

Privacy-Aware Document Visual Question Answering

no code implementations15 Dec 2023 Rubèn Tito, Khanh Nguyen, Marlon Tobaben, Raouf Kerkouche, Mohamed Ali Souibgui, Kangsoo Jung, Lei Kang, Ernest Valveny, Antti Honkela, Mario Fritz, Dimosthenis Karatzas

We employ a federated learning scheme, that reflects the real-life distribution of documents in different businesses, and we explore the use case where the ID of the invoice issuer is the sensitive information to be protected.

document understanding Federated Learning +3

STEP -- Towards Structured Scene-Text Spotting

1 code implementation5 Sep 2023 Sergi Garcia-Bordils, Dimosthenis Karatzas, Marçal Rusiñol

We introduce the structured scene-text spotting task, which requires a scene-text OCR system to spot text in the wild according to a query regular expression.

Optical Character Recognition (OCR) Scene Text Detection +2

Understanding Video Scenes through Text: Insights from Text-based Video Question Answering

no code implementations4 Sep 2023 Soumya Jahagirdar, Minesh Mathew, Dimosthenis Karatzas, C. V. Jawahar

Researchers have extensively studied the field of vision and language, discovering that both visual and textual content is crucial for understanding scenes effectively.

Domain Adaptation Question Answering +1

Reading Between the Lanes: Text VideoQA on the Road

no code implementations8 Jul 2023 George Tom, Minesh Mathew, Sergi Garcia, Dimosthenis Karatzas, C. V. Jawahar

Text and signs around roads provide crucial information for drivers, vital for safe navigation and situational awareness.

Question Answering Scene Text Recognition +1

ICDAR 2023 Competition on Reading the Seal Title

no code implementations24 Apr 2023 Wenwen Yu, MingYu Liu, Mingrui Chen, Ning Lu, Yinlong Wen, Yuliang Liu, Dimosthenis Karatzas, Xiang Bai

To promote research in this area, we organized ICDAR 2023 competition on reading the seal title (ReST), which included two tasks: seal title text detection (Task 1) and end-to-end seal title recognition (Task 2).

Optical Character Recognition (OCR) Task 2 +1

ICDAR 2023 Video Text Reading Competition for Dense and Small Text

no code implementations10 Apr 2023 Weijia Wu, Yuzhong Zhao, Zhuang Li, Jiahong Li, Mike Zheng Shou, Umapada Pal, Dimosthenis Karatzas, Xiang Bai

In this competition report, we establish a video text reading benchmark, DSText, which focuses on dense and small text reading challenges in the video with various scenarios.

Task 2 Text Detection +2

DocILE Benchmark for Document Information Localization and Extraction

1 code implementation11 Feb 2023 Štěpán Šimsa, Milan Šulc, Michal Uřičář, Yash Patel, Ahmed Hamdi, Matěj Kocián, Matyáš Skalický, Jiří Matas, Antoine Doucet, Mickaël Coustaty, Dimosthenis Karatzas

This paper introduces the DocILE benchmark with the largest dataset of business documents for the tasks of Key Information Localization and Extraction and Line Item Recognition.

Key Information Extraction Unsupervised Pre-training

Hierarchical multimodal transformers for Multi-Page DocVQA

1 code implementation7 Dec 2022 Rubèn Tito, Dimosthenis Karatzas, Ernest Valveny

The proposed method is based on a hierarchical transformer architecture where the encoder summarizes the most relevant information of every page and then, the decoder takes this summarized information to generate the final answer.

Question Answering Visual Question Answering

Watching the News: Towards VideoQA Models that can Read

no code implementations10 Nov 2022 Soumya Jahagirdar, Minesh Mathew, Dimosthenis Karatzas, C. V. Jawahar

We demonstrate the limitations of current Scene Text VQA and VideoQA methods and propose ways to incorporate scene text information into VideoQA methods.

Question Answering Video Question Answering +1

Show, Interpret and Tell: Entity-aware Contextualised Image Captioning in Wikipedia

no code implementations21 Sep 2022 Khanh Nguyen, Ali Furkan Biten, Andres Mafla, Lluis Gomez, Dimosthenis Karatzas

Particularly, a similar Wikimedia image can be used to illustrate different articles, and the produced caption needs to be adapted to a specific context, therefore allowing us to explore the limits of a model to adjust captions to different contextual information.

Image Captioning

MUST-VQA: MUltilingual Scene-text VQA

no code implementations14 Sep 2022 Emanuele Vivoli, Ali Furkan Biten, Andres Mafla, Dimosthenis Karatzas, Lluis Gomez

In this paper, we present a framework for Multilingual Scene Text Visual Question Answering that deals with new languages in a zero-shot fashion.

Question Answering Visual Question Answering

Text-DIAE: A Self-Supervised Degradation Invariant Autoencoders for Text Recognition and Document Enhancement

1 code implementation9 Mar 2022 Mohamed Ali Souibgui, Sanket Biswas, Andres Mafla, Ali Furkan Biten, Alicia Fornés, Yousri Kessentini, Josep Lladós, Lluis Gomez, Dimosthenis Karatzas

In this paper, we propose a Text-Degradation Invariant Auto Encoder (Text-DIAE), a self-supervised model designed to tackle two tasks, text recognition (handwritten or scene-text) and document image enhancement.

Document Enhancement Scene Text Recognition

Is An Image Worth Five Sentences? A New Look into Semantics for Image-Text Matching

no code implementations6 Oct 2021 Ali Furkan Biten, Andres Mafla, Lluis Gomez, Dimosthenis Karatzas

In this work, we propose two metrics that evaluate the degree of semantic relevance of retrieved items, independently of their annotated binary relevance.

Image Captioning Image-text matching +2

Let there be a clock on the beach: Reducing Object Hallucination in Image Captioning

1 code implementation4 Oct 2021 Ali Furkan Biten, Lluis Gomez, Dimosthenis Karatzas

Explaining an image with missing or non-existent objects is known as object bias (hallucination) in image captioning.

Hallucination Image Captioning +1

One-shot Compositional Data Generation for Low Resource Handwritten Text Recognition

no code implementations11 May 2021 Mohamed Ali Souibgui, Ali Furkan Biten, Sounak Dey, Alicia Fornés, Yousri Kessentini, Lluis Gomez, Dimosthenis Karatzas, Josep Lladós

Low resource Handwritten Text Recognition (HTR) is a hard problem due to the scarce annotated data and the very limited linguistic information (dictionaries and language models).

Handwritten Text Recognition HTR

Document Collection Visual Question Answering

no code implementations27 Apr 2021 Rubèn Tito, Dimosthenis Karatzas, Ernest Valveny

Current tasks and methods in Document Understanding aims to process documents as single elements.

document understanding Question Answering +1

InfographicVQA

no code implementations26 Apr 2021 Minesh Mathew, Viraj Bagal, Rubèn Pérez Tito, Dimosthenis Karatzas, Ernest Valveny, C. V Jawahar

Infographics are documents designed to effectively communicate information using a combination of textual, graphical and visual elements.

Question Answering Visual Question Answering

ICDAR2019 Competition on Scanned Receipt OCR and Information Extraction

1 code implementation18 Mar 2021 Zheng Huang, Kai Chen, Jianhua He, Xiang Bai, Dimosthenis Karatzas, Shjian Lu, C. V. Jawahar

In this competition, we set up three tasks, namely, Scanned Receipt Text Localisation (Task 1), Scanned Receipt OCR (Task 2) and Key Information Extraction from Scanned Receipts (Task 3).

Key Information Extraction Optical Character Recognition (OCR) +1

StacMR: Scene-Text Aware Cross-Modal Retrieval

1 code implementation8 Dec 2020 Andrés Mafla, Rafael Sampaio de Rezende, Lluís Gómez, Diane Larlus, Dimosthenis Karatzas

Then, armed with this dataset, we describe several approaches which leverage scene text, including a better scene-text aware cross-modal retrieval method which uses specialized representations for text from the captions and text from the visual scene, and reconcile them in a common embedding space.

Cross-Modal Retrieval Information Retrieval +1

Multi-Modal Reasoning Graph for Scene-Text Based Fine-Grained Image Classification and Retrieval

1 code implementation21 Sep 2020 Andres Mafla, Sounak Dey, Ali Furkan Biten, Lluis Gomez, Dimosthenis Karatzas

Scene text instances found in natural images carry explicit semantic information that can provide important cues to solve a wide array of computer vision problems.

Fine-Grained Image Classification General Classification +2

Document Visual Question Answering Challenge 2020

no code implementations20 Aug 2020 Minesh Mathew, Ruben Tito, Dimosthenis Karatzas, R. Manmatha, C. V. Jawahar

For the task 1 a new dataset is introduced comprising 50, 000 questions-answer(s) pairs defined over 12, 767 document images.

Question Answering Retrieval +2

Text Recognition -- Real World Data and Where to Find Them

no code implementations6 Jul 2020 Klára Janoušková, Jiri Matas, Lluis Gomez, Dimosthenis Karatzas

We present a method for exploiting weakly annotated images to improve text extraction pipelines.

Multimodal grid features and cell pointers for Scene Text Visual Question Answering

no code implementations1 Jun 2020 Lluís Gómez, Ali Furkan Biten, Rubèn Tito, Andrés Mafla, Marçal Rusiñol, Ernest Valveny, Dimosthenis Karatzas

This paper presents a new model for the task of scene text visual question answering, in which questions about a given image can only be answered by reading and understanding scene text that is present in it.

Question Answering Visual Question Answering

Exploring Hate Speech Detection in Multimodal Publications

1 code implementation9 Oct 2019 Raul Gomez, Jaume Gibert, Lluis Gomez, Dimosthenis Karatzas

In this work we target the problem of hate speech detection in multimodal publications formed by a text and an image.

Hate Speech Detection

ICDAR2019 Robust Reading Challenge on Arbitrary-Shaped Text (RRC-ArT)

1 code implementation16 Sep 2019 Chee-Kheng Chng, Yuliang Liu, Yipeng Sun, Chun Chet Ng, Canjie Luo, Zihan Ni, ChuanMing Fang, Shuaitao Zhang, Junyu Han, Errui Ding, Jingtuo Liu, Dimosthenis Karatzas, Chee Seng Chan, Lianwen Jin

This paper reports the ICDAR2019 Robust Reading Challenge on Arbitrary-Shaped Text (RRC-ArT) that consists of three major challenges: i) scene text detection, ii) scene text recognition, and iii) scene text spotting.

Scene Text Detection Scene Text Recognition +2

ICDAR 2019 Competition on Scene Text Visual Question Answering

no code implementations30 Jun 2019 Ali Furkan Biten, Rubèn Tito, Andres Mafla, Lluis Gomez, Marçal Rusiñol, Minesh Mathew, C. V. Jawahar, Ernest Valveny, Dimosthenis Karatzas

ST-VQA introduces an important aspect that is not addressed by any Visual Question Answering system up to date, namely the incorporation of scene text to answer questions asked about an image.

Question Answering Visual Question Answering

Selective Style Transfer for Text

1 code implementation4 Jun 2019 Raul Gomez, Ali Furkan Biten, Lluis Gomez, Jaume Gibert, Marçal Rusiñol, Dimosthenis Karatzas

This paper explores the possibilities of image style transfer applied to text maintaining the original transcriptions.

Data Augmentation Scene Text Detection +2

Good News, Everyone! Context driven entity-aware captioning for news images

1 code implementation CVPR 2019 Ali Furkan Biten, Lluis Gomez, Marçal Rusiñol, Dimosthenis Karatzas

We propose a novel captioning method that is able to leverage contextual information provided by the text of news articles associated with an image.

Descriptive Image Captioning

Self-Supervised Visual Representations for Cross-Modal Retrieval

no code implementations31 Jan 2019 Yash Patel, Lluis Gomez, Marçal Rusiñol, Dimosthenis Karatzas, C. V. Jawahar

Cross-modal retrieval methods have been significantly improved in last years with the use of deep neural networks and large-scale annotated datasets such as ImageNet and Places.

Cross-Modal Retrieval Image Classification +3

Self-Supervised Learning from Web Data for Multimodal Retrieval

1 code implementation7 Jan 2019 Raul Gomez, Lluis Gomez, Jaume Gibert, Dimosthenis Karatzas

In this work we propose to exploit this free available data to learn a multimodal image and text embedding, aiming to leverage the semantic knowledge learnt in the text domain and transfer it to a visual model for semantic image retrieval.

Image Retrieval Retrieval +1

Soft-PHOC Descriptor for End-to-End Word Spotting in Egocentric Scene Images

1 code implementation4 Sep 2018 Dena Bazazian, Dimosthenis Karatzas, Andrew D. Bagdanov

In this paper we propose a technique to create and exploit an intermediate representation of images based on text attributes which are character probability maps.

Attribute Dynamic Time Warping +1

Single Shot Scene Text Retrieval

3 code implementations ECCV 2018 Lluís Gómez, Andrés Mafla, Marçal Rusiñol, Dimosthenis Karatzas

In this way, the text based image retrieval task can be casted as a simple nearest neighbor search of the query text representation over the outputs of the CNN over the entire image database.

Image Retrieval Retrieval +2

Learning from #Barcelona Instagram data what Locals and Tourists post about its Neighbourhoods

1 code implementation20 Aug 2018 Raul Gomez, Lluis Gomez, Jaume Gibert, Dimosthenis Karatzas

We perform a language separate treatment of the data and show that it can be extrapolated to a tourists and locals separate analysis, and that tourism is reflected in Social Media at a neighborhood level.

Learning to Learn from Web Data through Deep Semantic Embeddings

1 code implementation20 Aug 2018 Raul Gomez, Lluis Gomez, Jaume Gibert, Dimosthenis Karatzas

In this paper we propose to learn a multimodal image and text embedding from Web and Social Media data, aiming to leverage the semantic knowledge learnt in the text domain and transfer it to a visual model for semantic image retrieval.

Image Retrieval Retrieval

TextTopicNet - Self-Supervised Learning of Visual Features Through Embedding Images on Semantic Text Spaces

1 code implementation4 Jul 2018 Yash Patel, Lluis Gomez, Raul Gomez, Marçal Rusiñol, Dimosthenis Karatzas, C. V. Jawahar

We show that adequate visual features can be learned efficiently by training a CNN to predict the semantic textual context in which a particular image is more probable to appear as an illustration.

Image Classification object-detection +3

The Robust Reading Competition Annotation and Evaluation Platform

no code implementations18 Oct 2017 Dimosthenis Karatzas, Lluis Gómez, Anguelos Nicolaou, Marçal Rusiñol

The ICDAR Robust Reading Competition (RRC), initiated in 2003 and re-established in 2011, has become a de-facto evaluation standard for robust reading systems and algorithms.

Management

Self-supervised learning of visual features through embedding images into text topic spaces

no code implementations CVPR 2017 Lluis Gomez, Yash Patel, Marçal Rusiñol, Dimosthenis Karatzas, C. V. Jawahar

End-to-end training from scratch of current deep architectures for new computer vision problems would require Imagenet-scale datasets, and this is not always possible.

Image Classification object-detection +3

Improving Text Proposals for Scene Images with Fully Convolutional Networks

1 code implementation16 Feb 2017 Dena Bazazian, Raul Gomez, Anguelos Nicolaou, Lluis Gomez, Dimosthenis Karatzas, Andrew D. Bagdanov

Text Proposals have emerged as a class-dependent version of object proposals - efficient approaches to reduce the search space of possible text object locations in an image.

Object Scene Text Recognition

TextProposals: a Text-specific Selective Search Algorithm for Word Spotting in the Wild

1 code implementation10 Apr 2016 Lluis Gomez-Bigorda, Dimosthenis Karatzas

Motivated by the success of powerful while expensive techniques to recognize words in a holistic way, object proposals techniques emerge as an alternative to the traditional text detectors.

Object

Improving patch-based scene text script identification with ensembles of conjoined networks

1 code implementation24 Feb 2016 Lluis Gomez, Anguelos Nicolaou, Dimosthenis Karatzas

Instead of resizing input images to a fixed aspect ratio as in the typical use of holistic CNN classifiers, we propose here a patch-based classification framework in order to preserve discriminative parts of the image that are characteristic of its class.

General Classification Optical Character Recognition (OCR)

A fine-grained approach to scene text script identification

no code implementations24 Feb 2016 Lluis Gomez, Dimosthenis Karatzas

Although widely studied for document images and handwritten documents, it remains an almost unexplored territory for scene text images.

Scene Text Recognition Text Detection

Visual Script and Language Identification

no code implementations8 Jan 2016 Anguelos Nicolaou, Andrew Bagdanov, Lluis Gomez-Bigorda, Dimosthenis Karatzas

In this paper we introduce a script identification method based on hand-crafted texture features and an artificial neural network.

Language Identification

Object Proposals for Text Extraction in the Wild

1 code implementation8 Sep 2015 Lluis Gomez, Dimosthenis Karatzas

The use of Object Proposals techniques in the scene text understanding field is innovative.

Object

Sparse Radial Sampling LBP for Writer Identification

no code implementations23 Apr 2015 Anguelos Nicolaou, Andrew D. Bagdanov, Marcus Liwicki, Dimosthenis Karatzas

In this paper we present the use of Sparse Radial Sampling Local Binary Patterns, a variant of Local Binary Patterns (LBP) for text-as-texture classification.

Binarization General Classification +1

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