Tesis doctoral de Robert Benavente Vidal
Colour is an important visual cue widely used in computer vision in the last years. Most of the methods developed so far aim to extract low-level colour features from images and such information do not have a direct link to the high-level semantics that humans use. The lack of this direct link, known as the semantic gap, is even more significant for some applications such as image retrieval where users require systems able to support queries in natural language or, at least, in a high-level language. Hence, the main goal of this thesis is to make a further step in the way of reducing the semantic gap in the task of giving names to colours in images. the main contribution of this thesis is a parametric colour-naming model for images. The problem is framed on the fuzzy set theory where each one of the 11 basic colour categories (white, black, red, green, yellow, blue, brown, purple, pink, orange, and grey) is characterized by a membership function. since the goal of such a model is to obtain the same name assignments as a human observer would provide, a set of human judgements is needed as starting point for the modelling process. To obtain such a data set we propose a methodology for fuzzy psychophysical experiments and a set of fuzzy judgements are obtained. The methodology and the results are validated by computing some usual statistics which are compared to previous experiments to show the equivalence of the results obtained with the new methodology and the ones from former experiments. The data set obtained has been made available online on the internet for the research community. the analysis of the results from the experiment allows defining the properties that the membership functions should fulfil. Several functions are proposed and evaluated to achieve the final triple sigmoid with elliptical centre (tse) model which provides good fitting to the learning data and a categorization of the munsell colour space which is consistent with previous works. The res
Datos académicos de la tesis doctoral «A parametric model for computational colour naming«
- Título de la tesis: A parametric model for computational colour naming
- Autor: Robert Benavente Vidal
- Universidad: Autónoma de barcelona
- Fecha de lectura de la tesis: 29/06/2007
Dirección y tribunal
- Director de la tesis
- Vanrell I Martorell María
- Tribunal
- Presidente del tribunal: Juan jose Villanueva pipaón
- Van de weijer joost (vocal)
- m. Lammens johan (vocal)
- rodrigo Martínez béjar (vocal)