| Records |
| Author |
Olivier Penacchio; C. Alejandro Parraga |
| Title |
What is the best criterion for an efficient design of retinal photoreceptor mosaics? |
Type |
Journal Article |
| Year |
2011 |
Publication  |
Perception |
Abbreviated Journal |
PER |
| Volume |
40 |
Issue |
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Pages |
197 |
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| Abstract |
The proportions of L, M and S photoreceptors in the primate retina are arguably determined by evolutionary pressure and the statistics of the visual environment. Two information theory-based approaches have been recently proposed for explaining the asymmetrical spatial densities of photoreceptors in humans. In the first approach Garrigan et al (2010 PLoS ONE 6 e1000677), a model for computing the information transmitted by cone arrays which considers the differential blurring produced by the long-wavelength accommodation of the eye’s lens is proposed. Their results explain the sparsity of S-cones but the optimum depends weakly on the L:M cone ratio. In the second approach (Penacchio et al, 2010 Perception 39 ECVP Supplement, 101), we show that human cone arrays make the visual representation scale-invariant, allowing the total entropy of the signal to be preserved while decreasing individual neurons’ entropy in further retinotopic representations. This criterion provides a thorough description of the distribution of L:M cone ratios and does not depend on differential blurring of the signal by the lens. Here, we investigate the similarities and differences of both approaches when applied to the same database. Our results support a 2-criteria optimization in the space of cone ratios whose components are arguably important and mostly unrelated.
[This work was partially funded by projects TIN2010-21771-C02-1 and Consolider-Ingenio 2010-CSD2007-00018 from the Spanish MICINN. CAP was funded by grant RYC-2007-00484] |
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CIC |
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no |
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Admin @ si @ PeP2011a |
Serial |
1719 |
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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 |
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Pages |
96 |
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| 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. |
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CIC |
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no |
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Admin @ si @ PPV2011 |
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1720 |
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| Author |
C. Alejandro Parraga |
| Title |
Colours and Colour Vision: An Introductory Survey |
Type |
Journal Article |
| Year |
2017 |
Publication |
Perception |
Abbreviated Journal |
PER |
| Volume |
46 |
Issue |
5 |
Pages |
640-641 |
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NEUROBIT; no menciona |
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no |
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Par2017 |
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3101 |
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| Author |
David Berga; Xavier Otazu; Xose R. Fernandez-Vidal; Victor Leboran; Xose M. Pardo |
| Title |
Generating Synthetic Images for Visual Attention Modeling |
Type |
Journal Article |
| Year |
2019 |
Publication |
Perception |
Abbreviated Journal |
PER |
| Volume |
48 |
Issue |
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Pages |
99 |
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NEUROBIT; no menciona |
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no |
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Admin @ si @ BOF2019 |
Serial |
3309 |
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| Author |
Domicele Jonauskaite; Lucia Camenzind; C. Alejandro Parraga; Cecile N Diouf; Mathieu Mercapide Ducommun; Lauriane Müller; Melanie Norberg; Christine Mohr |
| Title |
Colour-emotion associations in individuals with red-green colour blindness |
Type |
Journal Article |
| Year |
2021 |
Publication |
PeerJ |
Abbreviated Journal |
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| Volume |
9 |
Issue |
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Pages |
e11180 |
| Keywords |
Affect; Chromotherapy; Colour cognition; Colour vision deficiency; Cross-modal correspondences; Daltonism; Deuteranopia; Dichromatic; Emotion; Protanopia. |
| Abstract |
Colours and emotions are associated in languages and traditions. Some of us may convey sadness by saying feeling blue or by wearing black clothes at funerals. The first example is a conceptual experience of colour and the second example is an immediate perceptual experience of colour. To investigate whether one or the other type of experience more strongly drives colour-emotion associations, we tested 64 congenitally red-green colour-blind men and 66 non-colour-blind men. All participants associated 12 colours, presented as terms or patches, with 20 emotion concepts, and rated intensities of the associated emotions. We found that colour-blind and non-colour-blind men associated similar emotions with colours, irrespective of whether colours were conveyed via terms (r = .82) or patches (r = .80). The colour-emotion associations and the emotion intensities were not modulated by participants' severity of colour blindness. Hinting at some additional, although minor, role of actual colour perception, the consistencies in associations for colour terms and patches were higher in non-colour-blind than colour-blind men. Together, these results suggest that colour-emotion associations in adults do not require immediate perceptual colour experiences, as conceptual experiences are sufficient. |
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CIC; LAMP; 600.120; 600.128 |
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no |
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Admin @ si @ JCP2021 |
Serial |
3564 |
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| Author |
Zhen Xu; Sergio Escalera; Adrien Pavao; Magali Richard; Wei-Wei Tu; Quanming Yao; Huan Zhao; Isabelle Guyon |
| Title |
Codabench: Flexible, easy-to-use, and reproducible meta-benchmark platform |
Type |
Journal Article |
| Year |
2022 |
Publication |
Patterns |
Abbreviated Journal |
PATTERNS |
| Volume |
3 |
Issue |
7 |
Pages |
100543 |
| Keywords |
Machine learning; data science; benchmark platform; reproducibility; competitions |
| Abstract |
Obtaining a standardized benchmark of computational methods is a major issue in data-science communities. Dedicated frameworks enabling fair benchmarking in a unified environment are yet to be developed. Here, we introduce Codabench, a meta-benchmark platform that is open sourced and community driven for benchmarking algorithms or software agents versus datasets or tasks. A public instance of Codabench is open to everyone free of charge and allows benchmark organizers to fairly compare submissions under the same setting (software, hardware, data, algorithms), with custom protocols and data formats. Codabench has unique features facilitating easy organization of flexible and reproducible benchmarks, such as the possibility of reusing templates of benchmarks and supplying compute resources on demand. Codabench has been used internally and externally on various applications, receiving more than 130 users and 2,500 submissions. As illustrative use cases, we introduce four diverse benchmarks covering graph machine learning, cancer heterogeneity, clinical diagnosis, and reinforcement learning. |
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June 24, 2022 |
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Science Direct |
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HuPBA |
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no |
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Admin @ si @ XEP2022 |
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3764 |
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| Author |
Jordi Vitria; J. Llacer |
| Title |
Reconstructing 3D light microscopic images using the EM algorithm |
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Journal Article |
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1996 |
Publication |
Pattern Recognition Letters |
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17 |
Issue |
14 |
Pages |
1491–1498 |
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OR;MV |
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BCNPCL @ bcnpcl @ ViL1996 |
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74 |
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| Author |
A. Pujol; Jordi Vitria; Felipe Lumbreras; Juan J. Villanueva |
| Title |
Topological principal component analysis for face encoding and recognition |
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Journal Article |
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2001 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
22 |
Issue |
6-7 |
Pages |
769–776 |
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IF: 0.552 |
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ADAS;OR;MV |
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ADAS @ adas @ PVL2001 |
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155 |
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| Author |
Gemma Sanchez; Josep Llados; K. Tombre |
| Title |
A mean string algorithm to compute the average among a set of 2D shapes |
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Journal Article |
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2002 |
Publication |
Pattern Recognition Letters |
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PRL |
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23 |
Issue |
1-3 |
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203–214 |
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DAG; IF: 0.409 |
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no |
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DAG @ dag @ SLT2002 |
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275 |
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| Author |
A. Martinez; Jordi Vitria |
| Title |
Learning mixture models using a genetic version of the EM algorithm. |
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Journal Article |
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2000 |
Publication |
Pattern Recognition Letters |
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PRL |
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21 |
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8 |
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759–769 |
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OR;MV |
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no |
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BCNPCL @ bcnpcl @ MVi2000 |
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335 |
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M. Bressan; Jordi Vitria |
| Title |
Nonparametric Discriminant Analysis and Nearest Neighbor Classification |
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Journal Article |
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2003 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
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24 |
Issue |
15 |
Pages |
2743–2749 |
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IF: 0.809 |
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OR;MV |
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no |
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BCNPCL @ bcnpcl @ BrV2003b |
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367 |
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| Author |
Cristina Cañero; Petia Radeva |
| Title |
Vesselness enhancement diffusion |
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Journal Article |
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2003 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
24 |
Issue |
16 |
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3141–3151 |
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IF: 0.809 |
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MILAB |
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no |
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BCNPCL @ bcnpcl @ CaR2003 |
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371 |
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| Author |
David Guillamet; Jordi Vitria |
| Title |
Evaluation of distance metrics for recognition based on non-negative matrix factorization |
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Journal Article |
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2003 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
24 |
Issue |
9-10 |
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1599 –1605 |
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IF: 0.809 |
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OR;MV |
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no |
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BCNPCL @ bcnpcl @ GuV2003b |
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380 |
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| Author |
David Guillamet; Jordi Vitria; B. Shiele |
| Title |
Introducing a weighted non-negative matrix factorization for image classification |
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Journal Article |
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2003 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
24 |
Issue |
14 |
Pages |
2447–2454 |
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IF: 0.809 |
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OR;MV |
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no |
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BCNPCL @ bcnpcl @ GVS2003 |
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382 |
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| Author |
A. Sanfeliu; Juan J. Villanueva |
| Title |
An approach of visual motion analysis |
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Journal Article |
| Year |
2005 |
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Pattern Recognition Letters |
Abbreviated Journal |
PRL |
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26 |
Issue |
3 |
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355–368 |
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IF: 1.138 |
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ISE @ ise @ SaV2005 |
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561 |
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