Scientific publications

Multimodal Emotion Recognition in Conversations via Class-Wise Adaptive Modality Fusion and Affective Geometry

Oriol Marín, Roger Marí, Gloria Haro, Rafael Redondo

ECCV Workshops (Affective & Behavior Analysis in-the-wild - 11th ABAW) 2026

A multimodal emotion recognition model relying on video, speech, and text in conversations that proposes a class-wise adaptive modality fusion, and a valence-arousal prior for affective transitions.

Synthetic chest CT volume generated with the LAND model

Anatomically Guided Latent Diffusion for High-Resolution 3D Chest CT Synthesis

Anna Oliveras, Roger Marí, Rafael Redondo, Oriol Guardià, Cynthia I. Ugwu, Ana Tost, Bhalaji Nagarajan, Carolina Migliorelli, Vicent Ribas, Petia Radeva

Scientific Reports 2026

LAND is a latent diffusion model for synthetic chest CTs conditioned on lung and nodule masks. Its generated volumes improve downstream nodule segmentation and classification.

MExECON multi-view clothed-human reconstruction

MExECON: Multi-View Extended Explicit Clothed Humans Optimized via Normal Integration

Fulden Ece Uğur, Rafael Redondo, Albert Barreiro, Stefan Hristov, Roger Marí

VISAPP 2026

MExECON reconstructs clothed human avatars from sparse RGB images. It extends the single-view ECON method to an arbitrary number of viewpoints, improving geometry and pose estimation without retraining.

ShinyNeRF rendering of an anisotropic reflective object

ShinyNeRF: Digitizing Anisotropic Appearance in Neural Radiance Fields

Albert Barreiro, Roger Marí, Rafael Redondo, Gloria Haro, Carles Bosch

ISPRS Archives 2026

ShinyNeRF advances NeRF-based digitization of specular surfaces by modeling isotropic and anisotropic reflections with interpretable material and geometric parameters, enabling anisotropic material editing.

🏆 Best Paper Award - 2026 ISPRS / CIPA 3D-ARCH Workshop

Aerial images generated from semantic maps with latent diffusion

Latent Diffusion Approaches for Conditional Generation of Aerial Imagery: A Study

Roger Marí, Rafael Redondo

Image Processing On Line (IPOL) 2025

This study evaluates the fidelity and realism of RGB aerial images generated by several latent-diffusion architectures conditioned on semantic maps.

Comparison of neural radiance field renderings of specular objects

Specularity in NeRFs: A Comparative Study of Ref-NeRF and NRFF

Albert Barreiro, Roger Marí, Rafael Redondo, Gloria Haro, Carles Bosch, David Berga

Image Processing On Line (IPOL) 2025

A comparative evaluation of Ref-NeRF and NRFF for modeling specular surfaces, measuring the fidelity and realism of both neural-rendering approaches on synthetic scenes.

Synthetic lung nodules generated in chest CT scans

Characterization of Synthetic Lung Nodules in Conditional Latent Diffusion of Chest CT Scans

Roger Marí, Paula Subías-Beltrán, Carla Pitarch, Mar Galofré, Rafael Redondo

Artificial Intelligence Research and Development 2024

A conditional latent diffusion model generates 2D chest CT images from bounding-box masks and nodule attribute embeddings. The study examines control over lung-nodule placement and characteristics.

Listen and Move: Improving GANs Coherency in Agnostic Sound-to-Video Generation

Rafael Redondo

ICCV Workshops (AV4D) 2023

A sound-to-video generative adversarial model that improves image quality and temporal coherence through multi-route audio conditioning, extended recurrent audio analysis, and causal recurrent video prediction.

Extended Labeled Faces in-the-Wild (ELFW): Augmenting Classes for Face Segmentation

Rafael Redondo, Jaume Gibert

arXiv 2020

ELFW extends Labeled Faces in-the-Wild with refined masks, additional faces, and new face-related categories, using synthetic augmentation to improve semantic face segmentation.

AI in the Media and Creative Industries

Giuseppe Amato, Malte Behrmann, Frédéric Bimbot, Baptiste Caramiaux, Fabrizio Falchi, Ander Garcia, Joost Geurts, Jaume Gibert, Guillaume Gravier, Hadmut Holken, Hartmut Koenitz, Sylvain Lefebvre, Antoine Liutkus, Fabien Lotte, Andrew Perkis, Rafael Redondo, Enrico Turrin, Thierry Viéville, Emmanuel Vincent

Artificial Intelligence in the Media and Creative Industries 2019

A white paper surveying the opportunities, limitations, and research challenges of artificial intelligence across media production and the creative industries.

Psychophysiological Methods for Quality of Experience Research in Virtual Reality Systems and Applications

Miguel Barreda-Ángeles, Rafael Redondo-Tejedor, Alexandre Pereda-Baños

MMTC Communications - Frontiers 2018

An overview of psychophysiological measurements for evaluating quality of experience in virtual-reality systems and applications.

Automated Pollen Identification Using Microscopic Imaging and Texture Analysis

J. Víctor Marcos, Rodrigo Nava, Gabriel Cristóbal, Rafael Redondo, Boris Escalante-Ramírez, Gloria Bueno, Oscar Deniz, Ana González-Porto, Carmen Pardo, François Chung, Tomás Rodríguez

Micron 2015

An automated pollen-identification pipeline combining bright-field microscopy, image segmentation, texture descriptors, and supervised classification.

Pollen Segmentation and Feature Evaluation for Automatic Classification in Bright-Field Microscopy

Rafael Redondo, Gloria Bueno, François Chung, Rodrigo Nava, J. Víctor Marcos, Gabriel Cristóbal, Tomás Rodríguez, Ana González-Porto, Carmen Pardo, Oscar Déniz, Boris Escalante-Ramírez

Computers and Electronics in Agriculture 2015

A comparison of pollen-grain segmentation strategies and image features for automatic classification from bright-field microscopy.

Quality Evaluation of Microscopy and Scanned Histological Images for Diagnostic Purposes

Rafael Redondo, Gloria Bueno, Gabriel Cristóbal, J. Vidal, Oscar Deniz, Marcial García-Rojo, Carles Murillo, F. Relea, Jesús González

Micron 2012

A study of image-quality assessment for microscope and whole-slide histology images intended for reliable diagnostic use.

Autofocus Evaluation for Brightfield Microscopy Pathology

Rafael Redondo, Gloria Bueno, J. C. Valdiviezo, Rodrigo Nava, Gabriel Cristóbal, Oscar Deniz, Marcial García-Rojo, J. Salido, M. M. Fernández, J. Vidal, Boris Escalante-Ramírez

Journal of Biomedical Optics 2012

A comparative assessment of focus measures for automatic bright-field microscopy in digital pathology applications.

Comparative Evaluation of Autofocus Algorithms for a Real-Time System for Automatic Detection of Mycobacterium Tuberculosis

J. M. Mateos-Pérez, Rafael Redondo, Rodrigo Nava, J. C. Valdiviezo, Gabriel Cristóbal, Boris Escalante-Ramírez, M. Ruíz-Serrano, J. Pascau, M. Desco

Cytometry Part A 2012

A real-time microscopy study comparing autofocus algorithms for automated detection of Mycobacterium tuberculosis.

Evaluation of Autofocus Measures for Microscopy Images of Biopsy and Cytology

Rafael Redondo, Gloria Bueno, J. C. Valdiviezo, Rodrigo Nava, Gabriel Cristóbal, Marcial García-Rojo, Oscar Deniz, Boris Escalante-Ramírez

22nd Congress of the International Commission for Optics 2011

A comparison of focus measures for automatically selecting sharp biopsy and cytology microscopy images.

Multifocus Image Fusion Using the Log-Gabor Transform and a Multisize Windows Technique

Rafael Redondo, Filip Šroubek, Sylvain Fischer, Gabriel Cristóbal

Information Fusion 2009

A multifocus fusion method that combines log-Gabor multiresolution analysis with adaptive window sizes to select salient focused regions. It extends the effective depth of field.

Image Denoising and Quality Assessment Through the Rényi Entropy

Salvador Gabarda, Rafael Redondo, Elena Gil, Gabriel Cristóbal

Mathematics for Signal and Information Processing 2009

An image-denoising and quality-assessment approach based on Rényi entropy and directional space-frequency representations.

A 2D Wigner Distribution-Based Multisize Windows Technique for Image Fusion

Rafael Redondo, Sylvain Fischer, Filip Šroubek, Gabriel Cristóbal

Journal of Visual Communication and Image Representation 2008

An image-fusion scheme using a two-dimensional Wigner distribution as a saliency measure with adaptive multisize windows.

Self-Invertible 2D Log-Gabor Wavelets

Sylvain Fischer, Filip Šroubek, Laurent Perrinet, Rafael Redondo, Gabriel Cristóbal

International Journal of Computer Vision (IJCV) 2007

A self-invertible two-dimensional log-Gabor wavelet transform designed to retain the orientation selectivity and bandwidth properties of log-Gabor filters.

Iterated Tensor Voting and Curvature Improvement

Sylvain Fischer, Pierre Bayerl, Heiko Neumann, Rafael Redondo, Gabriel Cristóbal

Signal Processing 2007

An iterative tensor-voting formulation that improves local curvature estimation and the perceptual organization of image structures.

Sparse Approximation of Images Inspired from the Functional Architecture of the Primary Visual Areas

Sylvain Fischer, Rafael Redondo, Laurent Perrinet, Gabriel Cristóbal

EURASIP Journal on Advances in Signal Processing 2007

A biologically inspired sparse image representation using overcomplete log-Gabor features and local competition mechanisms modeled after primary visual cortex.

New Contributions on Image Fusion and Compression Based on Space-Frequency Representations

Rafael Redondo-Tejedor

PhD Thesis, Universidad Politécnica de Madrid 2007

My doctoral thesis on space-frequency image representations, with contributions to multiresolution image fusion, sparse coding, and image compression.

Sparse Overcomplete Gabor Wavelet Representation Based on Local Competitions

Sylvain Fischer, Gabriel Cristóbal, Rafael Redondo

IEEE Transactions on Image Processing 2006

A sparse coding method for overcomplete Gabor wavelets based on local inhibitory and facilitatory competitions between coefficients.

Sparse Edge Coding Using Overcomplete Gabor Wavelets

Sylvain Fischer, Gabriel Cristóbal, Rafael Redondo

IEEE International Conference on Image Processing (ICIP) 2005

A computationally efficient sparse edge-coding algorithm for overcomplete Gabor wavelets that preserves perceptually important contours.

Multifocus Fusion with Oriented Windows

Filip Šroubek, Salvador Gabarda, Rafael Redondo, Sylvain Fischer, Gabriel Cristóbal

SPIE Bioengineered and Bioinspired Systems II 2005

A multifocus image-fusion method using oriented analysis windows to improve focused-region selection near directional structures, indirectly producing depth estimation and extending the effective depth of field

Sparse Gabor Wavelets by Local Operations

Sylvain Fischer, Rafael Redondo, Laurent Perrinet, Gabriel Cristóbal

SPIE Bioengineered and Bioinspired Systems II 2005

A biologically motivated approach to sparse Gabor representations using local interactions between neighboring wavelet coefficients.

Multifocus Fusion with Multisize Windows

Rafael Redondo, Filip Šroubek, Sylvain Fischer, Gabriel Cristóbal

SPIE Applications of Digital Image Processing XXVIII 2005

A multifocus fusion technique that adapts the analysis-window size to local image content when selecting the sharpest source regions. It indirectly produces depth estimation and extends the effective depth of field.

Modeling of Simple Cells Through a Sparse Overcomplete Gabor Wavelet Representation Based on Local Inhibition and Facilitation

Rafael Redondo, Sylvain Fischer, Laurent Perrinet, Gabriel Cristóbal

Perception 2005

A model of visual-cortex simple cells based on overcomplete Gabor wavelets and local inhibitory and facilitatory interactions.

Are Iterations and Curvature Useful for Tensor Voting?

Sylvain Fischer, Pierre Bayerl, Heiko Neumann, Gabriel Cristóbal, Rafael Redondo

European Conference on Computer Vision (ECCV) 2004

An investigation of iterative refinement and curvature information in tensor voting for perceptual grouping and structure inference.

Automatic Screening and Multifocus Fusion Methods for Diatom Identification

Manuel Forero, Filip Šroubek, Jan Flusser, Rafael Redondo, Gabriel Cristóbal

SPIE Applications of Digital Image Processing XXVII 2004

Automated screening and multifocus image-fusion methods designed to support microscopic diatom identification.

Volumetric Image Fusion Using the Pseudo-Wigner Distribution

Salvador Gabarda, Gabriel Cristóbal, Sylvain Fischer, Rafael Redondo, Lorenzo Galleani, Leon Cohen

SPIE Applications of Digital Image Processing XXVII 2004

A volumetric image-fusion technique that uses pseudo-Wigner space-frequency distributions to identify and combine salient information.

Texture Segmentation and Analysis for Tissue Characterization

Rafael Redondo, Sylvain Fischer, Gabriel Cristóbal, Manuel Forero, Andrés Santos, J. Hormigo, Salvador Gabarda

SPIE Advanced Signal Processing Algorithms, Architectures, and Implementations XIV 2004

Local spectral texture analysis and segmentation methods applied to the characterization of biological tissue imagery.

Compression of Volumetric Data Sets Using Motion-Compensated Temporal Filtering

Rafael Redondo, J. Barbarien, Adrian Munteanu, Gabriel Cristóbal, Peter Schelkens

SPIE Wavelet Applications in Industrial Processing II 2004

A compression method for volumetric image sequences using motion-compensated temporal filtering to exploit redundancy between frames.

Diatom Screening and Classification by Shape Analysis

Manuel Forero-Vargas, Rafael Redondo, Gabriel Cristóbal

International Workshop on Visual Content Processing and Representation 2003

A shape-analysis pipeline for screening and classifying microscopic diatoms from segmented contours.

Texture Segmentation and Analysis Using Local Spectral Methods

Gabriel Cristóbal, Sylvain Fischer, Manuel Forero-Vargas, Rafael Redondo, J. Hormigo

VII Int. Symp. on Signal Processing and Its Applications (ISSPA) 2003

Local space-frequency methods for texture segmentation and analysis, including applications to structured and biological imagery.

Lossless Chain Coder for Gray Edge Images

Rafael Redondo, Gabriel Cristóbal

IEEE International Conference on Image Processing (ICIP) 2003

A lossless chain-coding representation for grayscale edge images that preserves both contour geometry and gray-level information.

JPEG2000 Matlab Toolbox (J2MT) Version 1.0.

Rafael Redondo, Gabriel Cristóbal

ISO/IEC/JTC1/ SC29/WG1 2002

A Matlab toolbox for implementing JPEG2000 compression algorithms.