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Author | Xim Cerda-Company; Xavier Otazu; Nilai Sallent; C. Alejandro Parraga | ||||
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The effect of luminance differences on color assimilation | Type | Journal Article | ||
Year | 2018 | Publication | Journal of Vision | Abbreviated Journal | JV |
Volume | 18 | Issue | 11 | Pages | 10-10 |
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Abstract | The color appearance of a surface depends on the color of its surroundings (inducers). When the perceived color shifts towards that of the surroundings, the effect is called “color assimilation” and when it shifts away from the surroundings it is called “color contrast.” There is also evidence that the phenomenon depends on the spatial configuration of the inducer, e.g., uniform surrounds tend to induce color contrast and striped surrounds tend to induce color assimilation. However, previous work found that striped surrounds under certain conditions do not induce color assimilation but induce color contrast (or do not induce anything at all), suggesting that luminance differences and high spatial frequencies could be key factors in color assimilation. Here we present a new psychophysical study of color assimilation where we assessed the contribution of luminance differences (between the target and its surround) present in striped stimuli. Our results show that luminance differences are key factors in color assimilation for stimuli varying along the s axis of MacLeod-Boynton color space, but not for stimuli varying along the l axis. This asymmetry suggests that koniocellular neural mechanisms responsible for color assimilation only contribute when there is a luminance difference, supporting the idea that mutual-inhibition has a major role in color induction. | ||||
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Notes | NEUROBIT; 600.120; 600.128 | Approved | no | ||
Call Number | Admin @ si @ COS2018 | Serial | 3148 | ||
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Author | Graham D. Finlayson; Javier Vazquez; Fufu Fang | ||||
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The Discrete Cosine Maximum Ignorance Assumption | Type | Conference Article | ||
Year | 2021 | Publication | 29th Color and Imaging Conference | Abbreviated Journal | |
Volume | Issue | Pages | 13-18 | ||
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Abstract | the performance of colour correction algorithms are dependent on the reflectance sets used. Sometimes, when the testing reflectance set is changed the ranking of colour correction algorithms also changes. To remove dependence on dataset we can
make assumptions about the set of all possible reflectances. In the Maximum Ignorance with Positivity (MIP) assumption we assume that all reflectances with per wavelength values between 0 and 1 are equally likely. A weakness in the MIP is that it fails to take into account the correlation of reflectance functions between wavelengths (many of the assumed reflectances are, in reality, not possible). In this paper, we take the view that the maximum ignorance assumption has merit but, hitherto it has been calculated with respect to the wrong coordinate basis. Here, we propose the Discrete Cosine Maximum Ignorance assumption (DCMI), where all reflectances that have coordinates between max and min bounds in the Discrete Cosine Basis coordinate system are equally likely. Here, the correlation between wavelengths is encoded and this results in the set of all plausible reflectances ’looking like’ typical reflectances that occur in nature. This said the DCMI model is also a superset of all measured reflectance sets. Experiments show that, in colour correction, adopting the DCMI results in similar colour correction performance as using a particular reflectance set. |
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Address | Virtual; November 2021 | ||||
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Area | Expedition | Conference | CIC | ||
Notes | CIC | Approved | no | ||
Call Number | FVF2021 | Serial | 3596 | ||
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Author | Oriol Vicente; Alicia Fornes; Ramon Valdes | ||||
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The Digital Humanities Network of the UABCie: a smart structure of research and social transference for the digital humanities | Type | Conference Article | ||
Year | 2016 | Publication | Digital Humanities Centres: Experiences and Perspectives | Abbreviated Journal | |
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Address | Warsaw; Poland; December 2016 | ||||
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Area | Expedition | Conference | DHLABS | ||
Notes | DAG; 600.097 | Approved | no | ||
Call Number | Admin @ si @ VFV2016 | Serial | 2908 | ||
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Author | Joost Van de Weijer; Shida Beigpour | ||||
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The Dichromatic Reflection Model: Future Research Directions and Applications | Type | Conference Article | ||
Year | 2011 | Publication | International Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | dblp | ||||
Abstract | The dichromatic reflection model (DRM) predicts that color distributions form a parallelogram in color space, whose shape is defined by the body reflectance and the illuminant color. In this paper we resume the assumptions which led to the DRM and shortly recall two of its main applications domains: color image segmentation and photometric invariant feature computation. After having introduced the model we discuss several limitations of the theory, especially those which are raised once working on real-world uncalibrated images. In addition, we summerize recent extensions of the model which allow to handle more complicated light interactions. Finally, we suggest some future research directions which would further extend its applicability. | ||||
Address | Algarve, Portugal | ||||
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Publisher | SciTePress | Place of Publication | Editor | Mestetskiy, Leonid and Braz, José | |
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ISSN | ISBN | 978-989-8425-47-8 | Medium | ||
Area | Expedition | Conference | VISIGRAPP | ||
Notes | CIC | Approved | no | ||
Call Number | Admin @ si @ WeB2011 | Serial | 1778 | ||
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Author | Albert Gordo; Ernest Valveny | ||||
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The diagonal split: A pre-segmentation step for page layout analysis & classification | Type | Conference Article | ||
Year | 2009 | Publication | 4th Iberian Conference on Pattern Recognition and Image Analysis | Abbreviated Journal | |
Volume | 5524 | Issue | Pages | 290–297 | |
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Abstract | Document classification is an important task in all the processes related to document storage and retrieval. In the case of complex documents, structural features are needed to achieve a correct classification. Unfortunately, physical layout analysis is error prone. In this paper we present a pre-segmentation step based on a divide & conquer strategy that can be used to improve the page segmentation results, independently of the segmentation algorithm used. This pre-segmentation step is evaluated in classification and retrieval using the selective CRLA algorithm for layout segmentation together with a clustering based on the voronoi area diagram, and tested on two different databases, MARG and Girona Archives. | ||||
Address | Póvoa de Varzim, Portugal | ||||
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Publisher | Springer Berlin Heidelberg | 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 | 978-3-642-02171-8 | Medium | |
Area | Expedition | Conference | IbPRIA | ||
Notes | DAG | Approved | no | ||
Call Number | DAG @ dag @ Gov2009b | Serial | 1176 | ||
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Author | Xavier Otazu; Xim Cerda-Company | ||||
Title ![]() |
The contribution of luminance and chromatic channels to color assimilation | Type | Journal Article | ||
Year | 2022 | Publication | Journal of Vision | Abbreviated Journal | JOV |
Volume | 22(6) | Issue | 10 | Pages | 1-15 |
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Abstract | Color induction is the phenomenon where the physical and the perceived colors of an object differ owing to the color distribution and the spatial configuration of the surrounding objects. Previous works studying this phenomenon on the lsY MacLeod–Boynton color space, show that color assimilation is present only when the magnocellular pathway (i.e., the Y axis) is activated (i.e., when there are luminance differences). Concretely, the authors showed that the effect is mainly induced by the koniocellular pathway (s axis), but not by the parvocellular pathway (l axis), suggesting that when magnocellular pathway is activated it inhibits the koniocellular pathway. In the present work, we study whether parvo-, konio-, and magnocellular pathways may influence on each other through the color induction effect. Our results show that color assimilation does not depend on a chromatic–chromatic interaction, and that chromatic assimilation is driven by the interaction between luminance and chromatic channels (mainly the magno- and the koniocellular pathways). Our results also show that chromatic induction is greatly decreased when all three visual pathways are simultaneously activated, and that chromatic pathways could influence each other through the magnocellular (luminance) pathway. In addition, we observe that chromatic channels can influence the luminance channel, hence inducing a small brightness induction. All these results show that color induction is a highly complex process where interactions between the several visual pathways are yet unknown and should be studied in greater detail. | ||||
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Notes | Neurobit; 600.128; 600.120; 600.158 | Approved | no | ||
Call Number | Admin @ si @ OtC2022 | Serial | 3685 | ||
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Author | Agata Lapedriza; David Masip; Jordi Vitria | ||||
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The contribution of external features to face recognition | Type | Book Chapter | ||
Year | 2005 | Publication | Pattern Recognition and Image Analysis (IbPRIA 2005), LNCS 3523: 537–544 | Abbreviated Journal | |
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Address | Estoril (Portugal) | ||||
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Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LMV2005a | Serial | 546 | ||
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Author | A. Richichi; O. Fors; M.T. Merino; Xavier Otazu; J. Nuñez; A. Prades; U. Thiele; D. Perez-Ramirez; F.J. Montojo | ||||
Title ![]() |
The Calar Alto lunar occultation program: update and new results | Type | Journal | ||
Year | 2006 | Publication | Astronomy and Astrophysics (Section ’Stellar structure and evolution’), 445:1081–1088 | Abbreviated Journal | |
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Notes | CIC | Approved | no | ||
Call Number | CAT @ cat @ RFM2006a | Serial | 589 | ||
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Author | Aura Hernandez-Sabate; Debora Gil | ||||
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The Benefits of IVUS Dynamics for Retrieving Stable Models of Arteries | Type | Book Chapter | ||
Year | 2012 | Publication | Intravascular Ultrasound | Abbreviated Journal | |
Volume | Issue | Pages | 185-206 | ||
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Publisher | Intech | Place of Publication | Editor | Yasuhiro Honda | |
Language | English | Summary Language | english | Original Title | |
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ISSN | ISBN | 978-953-307-900-4 | Medium | ||
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Notes | IAM; ADAS | Approved | no | ||
Call Number | IAM @ iam @ HeG2012 | Serial | 1684 | ||
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Author | Joana Maria Pujadas-Mora; Alicia Fornes; Oriol Ramos Terrades; Josep Llados; Jialuo Chen; Miquel Valls-Figols; Anna Cabre | ||||
Title ![]() |
The Barcelona Historical Marriage Database and the Baix Llobregat Demographic Database. From Algorithms for Handwriting Recognition to Individual-Level Demographic and Socioeconomic Data | Type | Journal | ||
Year | 2022 | Publication | Historical Life Course Studies | Abbreviated Journal | HLCS |
Volume | 12 | Issue | Pages | 99-132 | |
Keywords | Individual demographic databases; Computer vision, Record linkage; Social mobility; Inequality; Migration; Word spotting; Handwriting recognition; Local censuses; Marriage Licences | ||||
Abstract | The Barcelona Historical Marriage Database (BHMD) gathers records of the more than 600,000 marriages celebrated in the Diocese of Barcelona and their taxation registered in Barcelona Cathedral's so-called Marriage Licenses Books for the long period 1451–1905 and the BALL Demographic Database brings together the individual information recorded in the population registers, censuses and fiscal censuses of the main municipalities of the county of Baix Llobregat (Barcelona). In this ongoing collection 263,786 individual observations have been assembled, dating from the period between 1828 and 1965 by December 2020. The two databases started as part of different interdisciplinary research projects at the crossroads of Historical Demography and Computer Vision. Their construction uses artificial intelligence and computer vision methods as Handwriting Recognition to reduce the time of execution. However, its current state still requires some human intervention which explains the implemented crowdsourcing and game sourcing experiences. Moreover, knowledge graph techniques have allowed the application of advanced record linkage to link the same individuals and families across time and space. Moreover, we will discuss the main research lines using both databases developed so far in historical demography. | ||||
Address | June 23, 2022 | ||||
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Notes | DAG; 600.121; 600.162; 602.230; 600.140 | Approved | no | ||
Call Number | Admin @ si @ PFR2022 | Serial | 3737 | ||
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Author | Joana Maria Pujadas-Mora; Alicia Fornes; Josep Llados; Gabriel Brea-Martinez; Miquel Valls-Figols | ||||
Title ![]() |
The Baix Llobregat (BALL) Demographic Database, between Historical Demography and Computer Vision (nineteenth–twentieth centuries | Type | Book Chapter | ||
Year | 2019 | Publication | Nominative Data in Demographic Research in the East and the West: monograph | Abbreviated Journal | |
Volume | Issue | Pages | 29-61 | ||
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Abstract | The Baix Llobregat (BALL) Demographic Database is an ongoing database project containing individual census data from the Catalan region of Baix Llobregat (Spain) during the nineteenth and twentieth centuries. The BALL Database is built within the project ‘NETWORKS: Technology and citizen innovation for building historical social networks to understand the demographic past’ directed by Alícia Fornés from the Center for Computer Vision and Joana Maria Pujadas-Mora from the Center for Demographic Studies, both at the Universitat Autònoma de Barcelona, funded by the Recercaixa program (2017–2019).
Its webpage is http://dag.cvc.uab.es/xarxes/.The aim of the project is to develop technologies facilitating massive digitalization of demographic sources, and more specifically the padrones (local censuses), in order to reconstruct historical ‘social’ networks employing computer vision technology. Such virtual networks can be created thanks to the linkage of nominative records compiled in the local censuses across time and space. Thus, digitized versions of individual and family lifespans are established, and individuals and families can be located spatially. |
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ISSN | ISBN | 978-5-7996-2656-3 | Medium | ||
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Notes | DAG; 600.121 | Approved | no | ||
Call Number | Admin @ si @ PFL2019 | Serial | 3351 | ||
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Author | Isabelle Guyon; Kristin Bennett; Gavin Cawley; Hugo Jair Escalante; Sergio Escalera | ||||
Title ![]() |
The AutoML challenge on codalab | Type | Conference Article | ||
Year | 2015 | Publication | IEEE International Joint Conference on Neural Networks IJCNN2015 | Abbreviated Journal | |
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Address | Killarney; Ireland; July 2015 | ||||
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Area | Expedition | Conference | IJCNN | ||
Notes | HuPBA;MILAB | Approved | no | ||
Call Number | Admin @ si @ GBC2015b | Serial | 2650 | ||
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Author | A. Martinez; Robert Benavente | ||||
Title ![]() |
The AR face database | Type | Report | ||
Year | 1998 | Publication | CVC Technical Report #24 | Abbreviated Journal | |
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Address | CVC (UAB) | ||||
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Notes | CIC | Approved | no | ||
Call Number | CAT @ cat @ MaB1998 | Serial | 534 | ||
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Author | T.Chauhan; E.Perales; Kaida Xiao; E.Hird ; Dimosthenis Karatzas; Sophie Wuerger | ||||
Title ![]() |
The achromatic locus: Effect of navigation direction in color space | Type | Journal Article | ||
Year | 2014 | Publication | Journal of Vision | Abbreviated Journal | VSS |
Volume | 14 (1) | Issue | 25 | Pages | 1-11 |
Keywords | achromatic; unique hues; color constancy; luminance; color space | ||||
Abstract | 5Y Impact Factor: 2.99 / 1st (Ophthalmology)
An achromatic stimulus is defined as a patch of light that is devoid of any hue. This is usually achieved by asking observers to adjust the stimulus such that it looks neither red nor green and at the same time neither yellow nor blue. Despite the theoretical and practical importance of the achromatic locus, little is known about the variability in these settings. The main purpose of the current study was to evaluate whether achromatic settings were dependent on the task of the observers, namely the navigation direction in color space. Observers could either adjust the test patch along the two chromatic axes in the CIE u*v* diagram or, alternatively, navigate along the unique-hue lines. Our main result is that the navigation method affects the reliability of these achromatic settings. Observers are able to make more reliable achromatic settings when adjusting the test patch along the directions defined by the four unique hues as opposed to navigating along the main axes in the commonly used CIE u*v* chromaticity plane. This result holds across different ambient viewing conditions (Dark, Daylight, Cool White Fluorescent) and different test luminance levels (5, 20, and 50 cd/m2). The reduced variability in the achromatic settings is consistent with the idea that internal color representations are more aligned with the unique-hue lines than the u* and v* axes. |
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Notes | DAG; 600.077 | Approved | no | ||
Call Number | Admin @ si @ CPX2014 | Serial | 2418 | ||
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Author | Josep Llados | ||||
Title ![]() |
The 5G of Document Intelligence | Type | Conference Article | ||
Year | 2021 | Publication | 3rd Workshop on Future of Document Analysis and Recognition | Abbreviated Journal | |
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Address | Lausanne; Suissa; September 2021 | ||||
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Area | Expedition | Conference | FDAR | ||
Notes | DAG | Approved | no | ||
Call Number | Admin @ si @ | Serial | 3677 | ||
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