Netherlands Institute for Conservation, Art and Science

NICAS Colloquium

05Apr2018 12:00 - 13:00


The next edition of the NICAS Colloquium takes place on Thursday, 5 April 2018, from 12:00 to 13:00 in conference room B of the Atelier Building (Hobbemastraat 22, Amsterdam).


The chair of this colloquium will be Ineke Joosten (RCE).


The following presentations are scheduled for this edition of the NICAS Colloquium:

Gjorgji Strezoski

Baselines for the artistic domain

Baselines are the starting point of any quantitative research. Having baselines implies having data to generate the baselines for,
and having data leads to data exploration which leads to interesting qualitative findings. In this talk I will present baselines for the
artistic domain with a new benchmark dataset featuring over 2.5 million images with rich structured metadata dubbed OmniArt.
Currently, it is the largest structured artistic dataset in the world and it contains annotations for dozens of attribute types and
features semantic context information through concepts, IconClass labels, color information, and (limited) object level bounding
boxes. We establish and present baseline scores on multiple tasks like artist attribution, creation period estimation, type, style,
and school prediction. For additional types of analyses, we explore the color spaces of art through different types, identify faces,
people and objects in artworks, generate average artworks and evaluate a transfer learning object recognition pipeline.

Gjorgji Strezoski obtained his Master's degrees in Computer Science and Software Engineering in Skopje, Macedonia in 2016. In
November 2016 he started his PhD at the University of Amsterdam as a researcher in the NICAS VISTORY project. Currently,
he is developing deep multi-task multi-modal methods for artistic data analysis. His research interests include Computer Vision,
Visual Analytics, Machine Learning, Artificial Intelligence and Information Visualization.

Louise Chassouant

Determining carboxylic acid (COOH) concentration in model paint systems

From a chemical point of view, oil paintings are not static objects: their compositions slowly change over time and significant
alterations can sometimes be observed. The drying process of oil paintings involves the oxidation of the side chains of oil and, at
the same time, the hydrolysis of the binder. During the polymerization carboxylic acids groups are formed, which can react with
metal ions released from the pigment. The fresh paint is dried through a cascade of complex reactions, giving rise to a highly
cross-linked polymer network. The resulting metal carboxylates can be converted into crystalline metal soaps, which have been
linked to various cases of paint degradation. Pigmented model systems were used to overcome the heterogeneous complexity of
real paintings and greatly highlighted the effect of COOH concentration on the formation of amorphous zinc carboxylates,
crystalline zinc soaps and the contribution of hydrolysis during the drying of the paint.

Louise Chassouant recently obtained her Master’s degree in Molecular Chemistry from EPFL (Lausanne, Switzerland) after doing
her Master thesis research project at HIMS (UvA), where she focused on the influence of carboxylic acid concentration on metal
soap formation in oil paintings.

NICAS Colloquium

More information about the NICAS Colloquium can be found here.



Thursday, 22 March 2018


12:00 – 13:00 hrs


Conference Room B, Atelier Building
Hobbemastraat 22, Amsterdam

Published by  NICAS