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Author	A.Gonzalez; Robert Benavente; Olivier Penacchio; Javier Vazquez; Maria Vanrell; C. Alejandro Parraga
Title	Coloresia: An Interactive Colour Perception Device for the Visually Impaired			Type	Book Chapter
Year	2013	Publication	Multimodal Interaction in Image and Video Applications	Abbreviated Journal
Volume	48	Issue		Pages	47-66
Keywords
Abstract	A significative percentage of the human population suffer from impairments in their capacity to distinguish or even see colours. For them, everyday tasks like navigating through a train or metro network map becomes demanding. We present a novel technique for extracting colour information from everyday natural stimuli and presenting it to visually impaired users as pleasant, non-invasive sound. This technique was implemented inside a Personal Digital Assistant (PDA) portable device. In this implementation, colour information is extracted from the input image and categorised according to how human observers segment the colour space. This information is subsequently converted into sound and sent to the user via speakers or headphones. In the original implementation, it is possible for the user to send its feedback to reconfigure the system, however several features such as these were not implemented because the current technology is limited.We are confident that the full implementation will be possible in the near future as PDA technology improves.
Address
Corporate Author				Thesis
Publisher	Springer Berlin Heidelberg	Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1868-4394	ISBN	978-3-642-35931-6	Medium
Area		Expedition		Conference
Notes	CIC; 600.052; 605.203			Approved	no
Call Number	Admin @ si @ GBP2013			Serial	2266
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Author	Agnes Borras; Francesc Tous; Josep Llados; Maria Vanrell
Title	High-Level Clothes Description Based on Color-Texture and Structural Features			Type	Book Chapter
Year	2003	Publication	Lecture Notes in Computer Science	Abbreviated Journal
Volume	2652	Issue		Pages	108–116
Keywords
Abstract	This work is a part of a surveillance system where content- based image retrieval is done in terms of people appearance. Given an image of a person, our work provides an automatic description of his clothing according to the colour, texture and structural composition of its garments. We present a two-stage process composed by image segmentation and a region-based interpretation. We segment an image by modelling it due to an attributed graph and applying a hybrid method that follows a split-and-merge strategy. We propose the interpretation of five cloth combinations that are modelled in a graph structure in terms of region features. The interpretation is viewed as a graph matching with an associated cost between the segmentation and the cloth models. Fi- nally, we have tested the process with a ground-truth of one hundred images.
Address	Springer-Verlag
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	DAG;CIC			Approved	no
Call Number	CAT @ cat @ BTL2003a			Serial	368
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Author	Agnes Borras; Francesc Tous; Josep Llados; Maria Vanrell
Title	High-Level Clothes Description Based on Colour-Texture and Structural Features			Type	Conference Article
Year	2003	Publication	1rst. Iberian Conference on Pattern Recognition and Image Analysis IbPRIA 2003	Abbreviated Journal
Volume		Issue		Pages
Keywords
Abstract
Address	Palma de Mallorca
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	DAG;CIC			Approved	no
Call Number	CAT @ cat @ BTL2003b			Serial	369
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Author	Aleksandr Setkov; Fabio Martinez Carillo; Michele Gouiffes; Christian Jacquemin; Maria Vanrell; Ramon Baldrich
Title	DAcImPro: A Novel Database of Acquired Image Projections and Its Application to Object Recognition			Type	Conference Article
Year	2015	Publication	Advances in Visual Computing. Proceedings of 11th International Symposium, ISVC 2015 Part II	Abbreviated Journal
Volume	9475	Issue		Pages	463-473
Keywords	Projector-camera systems; Feature descriptors; Object recognition
Abstract	Projector-camera systems are designed to improve the projection quality by comparing original images with their captured projections, which is usually complicated due to high photometric and geometric variations. Many research works address this problem using their own test data which makes it extremely difficult to compare different proposals. This paper has two main contributions. Firstly, we introduce a new database of acquired image projections (DAcImPro) that, covering photometric and geometric conditions and providing data for ground-truth computation, can serve to evaluate different algorithms in projector-camera systems. Secondly, a new object recognition scenario from acquired projections is presented, which could be of a great interest in such domains, as home video projections and public presentations. We show that the task is more challenging than the classical recognition problem and thus requires additional pre-processing, such as color compensation or projection area selection.
Address
Corporate Author				Thesis
Publisher	Springer International Publishing	Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title	LNCS
Series Volume		Series Issue		Edition
ISSN	0302-9743	ISBN	978-3-319-27862-9	Medium
Area		Expedition		Conference	ISVC
Notes	CIC			Approved	no
Call Number	Admin @ si @ SMG2015			Serial	2736
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Author	Anna Salvatella; Maria Vanrell
Title	Towards a texture representation database			Type	Report
Year	2002	Publication	CVC Technical Report #60	Abbreviated Journal
Volume		Issue		Pages
Keywords
Abstract
Address	CVC (UAB)
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	CAT @ cat @ SaV2002			Serial	526
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Author	Anna Salvatella; Maria Vanrell; Juan J. Villanueva
Title	Texture Description based on Subtexture Components, 3rd International Workshop on Texture Syntesis and Analysis			Type	Conference Article
Year	2003	Publication	3rd International Workshop on Texture Synthesis and Analysis,	Abbreviated Journal
Volume		Issue		Pages	77–82
Keywords
Abstract
Address	Nice
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN	1-904410-11-1	Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	CAT @ cat @ SVV2003			Serial	422
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Author	Anna Salvatella; Maria Vanrell; Ramon Baldrich
Title	Subtexture Components for Texture Description			Type	Miscellaneous
Year	2003	Publication	Lecture Notes in Computer Science, vol 2652, pp 884–892	Abbreviated Journal
Volume		Issue		Pages
Keywords
Abstract
Address	Springer-Verlag
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	CAT @ cat @ SVR2003			Serial	421
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Author	C. Alejandro Parraga; Javier Vazquez; Maria Vanrell
Title	A new cone activation-based natural images dataset			Type	Journal Article
Year	2009	Publication	Perception	Abbreviated Journal	PER
Volume	36	Issue		Pages	180
Keywords
Abstract	We generated a new dataset of digital natural images where each colour plane corresponds to the human LMS (long-, medium-, short-wavelength) cone activations. The images were chosen to represent five different visual environments (eg forest, seaside, mountain snow, urban, motorways) and were taken under natural illumination at different times of day. At the bottom-left corner of each picture there was a matte grey ball of approximately constant spectral reflectance (across the camera's response spectrum,) and nearly Lambertian reflective properties, which allows to compute (and remove, if necessary) the illuminant's colour and intensity. The camera (Sigma Foveon SD10) was calibrated by measuring its sensor's spectral responses using a set of 31 spectrally narrowband interference filters. This allowed conversion of the final camera-dependent RGB colour space into the Smith and Pokorny (1975) cone activation space by means of a polynomial transformation, optimised for a set of 1269 Munsell chip reflectances. This new method is an improvement over the usual 3 × 3 matrix transformation which is only accurate for spectrally-narrowband colours. The camera-to-LMS transformation can be recalculated to consider other non-human visual systems. The dataset is available to download from our website.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	CAT @ cat @ PVV2009			Serial	1193
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Author	C. Alejandro Parraga; Jordi Roca; Maria Vanrell
Title	Do Basic Colors Influence Chromatic Adaptation?			Type	Journal Article
Year	2011	Publication	Journal of Vision	Abbreviated Journal	VSS
Volume	11	Issue	11	Pages	85
Keywords
Abstract	Color constancy (the ability to perceive colors relatively stable under different illuminants) is the result of several mechanisms spread across different neural levels and responding to several visual scene cues. It is usually measured by estimating the perceived color of a grey patch under an illuminant change. In this work, we hypothesize whether chromatic adaptation (without a reference white or grey) could be driven by certain colors, specifically those corresponding to the universal color terms proposed by Berlin and Kay (1969). To this end we have developed a new psychophysical paradigm in which subjects adjust the color of a test patch (in CIELab space) to match their memory of the best example of a given color chosen from the universal terms list (grey, red, green, blue, yellow, purple, pink, orange and brown). The test patch is embedded inside a Mondrian image and presented on a calibrated CRT screen inside a dark cabin. All subjects were trained to “recall” their most exemplary colors reliably from memory and asked to always produce the same basic colors when required under several adaptation conditions. These include achromatic and colored Mondrian backgrounds, under a simulated D65 illuminant and several colored illuminants. A set of basic colors were measured for each subject under neutral conditions (achromatic background and D65 illuminant) and used as “reference” for the rest of the experiment. The colors adjusted by the subjects in each adaptation condition were compared to the reference colors under the corresponding illuminant and a “constancy index” was obtained for each of them. Our results show that for some colors the constancy index was better than for grey. The set of best adapted colors in each condition were common to a majority of subjects and were dependent on the chromaticity of the illuminant and the chromatic background considered.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1534-7362	ISBN		Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	Admin @ si @ PRV2011			Serial	1759
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Author	C. Alejandro Parraga; Olivier Penacchio; Maria Vanrell
Title	Retinal Filtering Matches Natural Image Statistics at Low Luminance Levels			Type	Journal Article
Year	2011	Publication	Perception	Abbreviated Journal	PER
Volume	40	Issue		Pages	96
Keywords
Abstract	The assumption that the retina’s main objective is to provide a minimum entropy representation to higher visual areas (ie efficient coding principle) allows to predict retinal filtering in space–time and colour (Atick, 1992 Network 3 213–251). This is achieved by considering the power spectra of natural images (which is proportional to 1/f2) and the suppression of retinal and image noise. However, most studies consider images within a limited range of lighting conditions (eg near noon) whereas the visual system’s spatial filtering depends on light intensity and the spatiochromatic properties of natural scenes depend of the time of the day. Here, we explore whether the dependence of visual spatial filtering on luminance match the changes in power spectrum of natural scenes at different times of the day. Using human cone-activation based naturalistic stimuli (from the Barcelona Calibrated Images Database), we show that for a range of luminance levels, the shape of the retinal CSF reflects the slope of the power spectrum at low spatial frequencies. Accordingly, the retina implements the filtering which best decorrelates the input signal at every luminance level. This result is in line with the body of work that places efficient coding as a guiding neural principle.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	Admin @ si @ PPV2011			Serial	1720
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Author	C. Alejandro Parraga; Ramon Baldrich; Maria Vanrell
Title	Accurate Mapping of Natural Scenes Radiance to Cone Activation Space: A New Image Dataset			Type	Conference Article
Year	2010	Publication	5th European Conference on Colour in Graphics, Imaging and Vision and 12th International Symposium on Multispectral Colour Science	Abbreviated Journal
Volume		Issue		Pages	50–57
Keywords
Abstract	The characterization of trichromatic cameras is usually done in terms of a device-independent color space, such as the CIE 1931 XYZ space. This is indeed convenient since it allows the testing of results against colorimetric measures. We have characterized our camera to represent human cone activation by mapping the camera sensor's (RGB) responses to human (LMS) through a polynomial transformation, which can be “customized” according to the types of scenes we want to represent. Here we present a method to test the accuracy of the camera measures and a study on how the choice of training reflectances for the polynomial may alter the results.
Address	Joensuu, Finland
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN	9781617388897	Medium
Area		Expedition		Conference	CGIV/MCS
Notes	CIC			Approved	no
Call Number	CAT @ cat @ PBV2010a			Serial	1322
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Author	C. Alejandro Parraga; Robert Benavente; Maria Vanrell
Title	Modeling Colour-Naming Space with Fuzzy Sets			Type	Journal
Year	2007	Publication	Perception 36:198–198, supp	Abbreviated Journal
Volume		Issue		Pages
Keywords
Abstract
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	CAT @ cat @ PBV2007			Serial	843
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Author	C. Alejandro Parraga; Robert Benavente; Maria Vanrell
Title	Towards a general model of colour categorization which considers context			Type	Journal Article
Year	2010	Publication	Perception. ECVP Abstract Supplement	Abbreviated Journal	PER
Volume	39	Issue		Pages	86
Keywords
Abstract	In two previous experiments [Parraga et al, 2009 J. of Im. Sci. and Tech 53(3) 031106; Benavente et al,2009 Perception 38 ECVP Supplement, 36] the boundaries of basic colour categories were measured. In the ﬁrst experiment, samples were presented in isolation (ie on a dark background) and boundaries were measured using a yes/no paradigm. In the second, subjects adjusted the chromaticity of a sample presented on a random Mondrian background to ﬁnd the boundary between pairs of adjacent colours. Results from these experiments showed signiﬁcant dierences but it was not possible to conclude whether this discrepancy was due to the absence/presence of a colourful background or to the dierences in the paradigms used. In this work, we settle this question by repeating the ﬁrst experiment (ie samples presented on a dark background) using the second paradigm. A comparison of results shows that although boundary locations are very similar, boundaries measured in context are signiﬁcantly dierent(more diuse) than those measured in isolation (conﬁrmed by a Student’s t-test analysis on the subject’s answers statistical distributions). In addition, we completed the mapping of colour name space by measuring the boundaries between chromatic colours and the achromatic centre. With these results we completed our parametric fuzzy-sets model of colour naming space.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference
Notes	CIC			Approved	no
Call Number	CAT @ cat @ PBV2010b			Serial	1326
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Author	C. Alejandro Parraga; Robert Benavente; Maria Vanrell; Ramon Baldrich
Title	Modelling Inter-Colour Regions of Colour Naming Space			Type	Conference Article
Year	2008	Publication	4th European Conference on Colour in Graphics, Imaging and Vision Proceedings	Abbreviated Journal
Volume		Issue		Pages	218–222
Keywords
Abstract
Address	Terrassa (Spain)
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	CGIV08
Notes	CAT;CIC			Approved	no
Call Number	CAT @ cat @ PBV2008			Serial	969
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