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  1. Artikel ; Online: castleCSF - A contrast sensitivity function of color, area, spatiotemporal frequency, luminance and eccentricity.

    Ashraf, Maliha / Mantiuk, Rafal K / Chapiro, Alexandre / Wuerger, Sophie

    Journal of vision

    2024  Band 24, Heft 4, Seite(n) 5

    Abstract: The contrast sensitivity function (CSF) is a fundamental visual model explaining our ability to detect small contrast patterns. CSFs found many applications in engineering, where they can be used to optimize a design for perceptual limits. To serve such ... ...

    Abstract The contrast sensitivity function (CSF) is a fundamental visual model explaining our ability to detect small contrast patterns. CSFs found many applications in engineering, where they can be used to optimize a design for perceptual limits. To serve such a purpose, CSFs must explain possibly a complete set of stimulus parameters, such as spatial and temporal frequency, luminance, and others. Although numerous contrast sensitivity measurements can be found in the literature, none fully explains the complete space of stimulus parameters. Therefore, in this work, we first collect and consolidate contrast sensitivity measurements from 18 studies, which explain the sensitivity variation across the parameters of interest. Then, we build an analytical contrast sensitivity model that explains the data from all those studies. The proposed castleCSF model explains the sensitivity as the function of spatial and temporal frequencies, an arbitrary contrast modulation direction in the color space, mean luminance, and chromaticity of the background, eccentricity, and stimulus area. The proposed model uses the same set of parameters to explain the data from 18 studies with an error of 3.59 dB. The consolidated contrast sensitivity data and the code for the model are publicly available at https://github.com/gfxdisp/castleCSF/.
    Mesh-Begriff(e) Humans ; Contrast Sensitivity
    Sprache Englisch
    Erscheinungsdatum 2024-04-04
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2106064-2
    ISSN 1534-7362 ; 1534-7362
    ISSN (online) 1534-7362
    ISSN 1534-7362
    DOI 10.1167/jov.24.4.5
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Buch ; Online: Training Neural Networks on RAW and HDR Images for Restoration Tasks

    Luo, Lei / Chapiro, Alexandre / Xiang, Xiaoyu / Fan, Yuchen / Ranjan, Rakesh / Mantiuk, Rafal

    2023  

    Abstract: The vast majority of standard image and video content available online is represented in display-encoded color spaces, in which pixel values are conveniently scaled to a limited range (0-1) and the color distribution is approximately perceptually uniform. ...

    Abstract The vast majority of standard image and video content available online is represented in display-encoded color spaces, in which pixel values are conveniently scaled to a limited range (0-1) and the color distribution is approximately perceptually uniform. In contrast, both camera RAW and high dynamic range (HDR) images are often represented in linear color spaces, in which color values are linearly related to colorimetric quantities of light. While training on commonly available display-encoded images is a well-established practice, there is no consensus on how neural networks should be trained for tasks on RAW and HDR images in linear color spaces. In this work, we test several approaches on three popular image restoration applications: denoising, deblurring, and single-image super-resolution. We examine whether HDR/RAW images need to be display-encoded using popular transfer functions (PQ, PU21, mu-law), or whether it is better to train in linear color spaces, but use loss functions that correct for perceptual non-uniformity. Our results indicate that neural networks train significantly better on HDR and RAW images represented in display-encoded color spaces, which offer better perceptual uniformity than linear spaces. This small change to the training strategy can bring a very substantial gain in performance, up to 10-15 dB.
    Schlagwörter Electrical Engineering and Systems Science - Image and Video Processing ; Computer Science - Computer Vision and Pattern Recognition
    Thema/Rubrik (Code) 006
    Erscheinungsdatum 2023-12-06
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Buch: Jean-Antoine Lépine ; Horloger 1720-1814 ; Histoire du développement de l'horlogerie en France, de 1760 à l`Empire

    Chapiro, Adolphe

    1988  

    Verfasserangabe Adolphe Chapiro
    Umfang 277 S
    Verlag Éd. de l'Amateur
    Erscheinungsort Paris
    Dokumenttyp Buch
    ISBN 2859170766 ; 9782859170769
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  4. Artikel: Polymerization by rays.

    CHAPIRO, A

    Comptes rendus hebdomadaires des seances de l'Academie des sciences

    1949  Band 229, Heft 17, Seite(n) 827–829

    Titelübersetzung Polymerisation par les rayons.
    Mesh-Begriff(e) Radioactivity
    Sprache Französisch
    Erscheinungsdatum 1949-10-24
    Erscheinungsland France
    Dokumenttyp Journal Article
    ZDB-ID 215733-0
    ISSN 0001-4036
    ISSN 0001-4036
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Buch ; Konferenzbeitrag: Advances in radiation research, biology and medicine

    Chapiro, A / Duplan, J. F

    1973  

    Titelvarianten Biology and medicine
    Veranstaltung/Kongress International Congress of Radiation Research (4th, 1970, Evian)
    Verfasserangabe editors, J. F. Duplan and A. Chapiro
    Mesh-Begriff(e) Radiation ; Radiobiology ; Radiotherapy
    Sprache Englisch ; Französisch
    Umfang 3 v. (xxiv, 1521 p.) :, ill.
    Verlag Gordon and Breach
    Erscheinungsort New York
    Dokumenttyp Buch ; Konferenzbeitrag
    Anmerkung ISBN 0-677-30880-9 (v. 1) ; Contributions in English or French.
    ISBN 9780677308807 ; 0677308809
    Datenquelle Katalog der US National Library of Medicine (NLM)

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  6. Buch ; Konferenzbeitrag: Advances in radiation research, physics and chemistry

    Duplan, J. F / Chapiro, A

    1973  

    Titelvarianten Physics and chemistry
    Veranstaltung/Kongress International Congress of Radiation Research (4th, 1970, Evian)
    Verfasserangabe editors, J. F. Duplan and A. Chapiro
    Mesh-Begriff(e) Radiation ; Radiochemistry
    Sprache Englisch ; Französisch
    Umfang 2 v. (xii, 649 p. ):, ill.
    Verlag Gordon and Breach
    Erscheinungsort New York
    Dokumenttyp Buch ; Konferenzbeitrag
    Anmerkung ISBN 0-677-30640-7 (v. 1). ; Contributions in English or French.
    ISBN 9780677306407 ; 0677306407
    Datenquelle Katalog der US National Library of Medicine (NLM)

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  7. Buch: Radiation chemistry of polymeric systems

    Chapiro, Adolphe

    (High polymers ; 15)

    1962  

    Verfasserangabe Adolphe Chapiro
    Serientitel High polymers ; 15
    Schlagwörter Polymers ; Radiochemistry
    Sprache Englisch
    Umfang XVI, 712 S, Ill., graph. Darst
    Verlag Interscience
    Erscheinungsort New York, NY u.a.
    Dokumenttyp Buch
    Anmerkung Literaturangaben
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  8. Artikel: Sur une méthode de dosage chimique des rayons gamma en présence de neutrons lents.

    CORVAL, M / CHAPIRO, A / COUSIN, C

    Comptes rendus hebdomadaires des seances de l'Academie des sciences

    1952  Band 235, Heft 15, Seite(n) 799–801

    Titelübersetzung A method for chemical determination of gamma rays in the presence of slow neutrons.
    Mesh-Begriff(e) Gamma Rays ; Neutrons ; Radiation
    Sprache Nicht zu entscheiden
    Erscheinungsdatum 1952-10-13
    Erscheinungsland France
    Dokumenttyp Journal Article
    ZDB-ID 215733-0
    ISSN 0001-4036
    ISSN 0001-4036
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel ; Online: Observation of a J(PC)=1-+ exotic resonance in diffractive dissociation of 190   GeV/c π- into π- π- π+.

    Alekseev, M G / Alexakhin, V Yu / Alexandrov, Yu / Alexeev, G D / Amoroso, A / Austregesilo, A / Badełek, B / Balestra, F / Ball, J / Barth, J / Baum, G / Bedfer, Y / Bernhard, J / Bertini, R / Bettinelli, M / Birsa, R / Bisplinghoff, J / Bordalo, P / Bradamante, F /
    Bravar, A / Bressan, A / Brona, G / Burtin, E / Bussa, M P / Chapiro, A / Chiosso, M / Chung, S U / Cicuttin, A / Colantoni, M / Crespo, M L / Dalla Torre, S / Dafni, T / Das, S / Dasgupta, S S / Denisov, O Yu / Dhara, L / Diaz, V / Dinkelbach, A M / Donskov, S V / Doshita, N / Duic, V / Dünnweber, W / Efremov, A / El Alaoui, A / Eversheim, P D / Eyrich, W / Faessler, M / Ferrero, A / Finger, M / Fischer, H / Franco, C / Friedrich, J M / Garfagnini, R / Gautheron, F / Gavrichtchouk, O P / Gazda, R / Gerassimov, S / Geyer, R / Giorgi, M / Gobbo, B / Goertz, S / Grabmüller, S / Grajek, O A / Grasso, A / Grube, B / Gushterski, R / Guskov, A / Haas, F / von Harrach, D / Hasegawa, T / Heckmann, J / Heinsius, F H / Hermann, R / Herrmann, F / Hess, C / Hinterberger, F / Horikawa, N / Höppner, Ch / d'Hose, N / Ilgner, C / Ishimoto, S / Ivanov, O / Ivanshin, Yu / Iwata, T / Jahn, R / Jasinski, P / Jegou, G / Joosten, R / Kabuss, E / Kang, D / Ketzer, B / Khaustov, G V / Khokhlov, Yu A / Kisselev, Yu / Klein, F / Klimaszewski, K / Koblitz, S / Koivuniemi, J H / Kolosov, V N / Komissarov, E V / Kondo, K / Königsmann, K / Konopka, R / Konorov, I / Konstantinov, V F / Korzenev, A / Kotzinian, A M / Kouznetsov, O / Kowalik, K / Krämer, M / Kral, A / Kroumchtein, Z V / Kuhn, R / Kunne, F / Kurek, K / Lauser, L / Le Goff, J M / Lednev, A A / Lehmann, A / Levorato, S / Lichtenstadt, J / Liska, T / Maggiora, A / Maggiora, M / Magnon, A / Mallot, G K / Mann, A / Marchand, C / Marroncle, J / Martin, A / Marzec, J / Massmann, F / Matsuda, T / Maximov, A N / Meyer, W / Michigami, T / Mikhailov, Yu V / Moinester, M A / Mutter, A / Nagaytsev, A / Nagel, T / Nassalski, J / Negrini, T / Nerling, F / Neubert, S / Neyret, D / Nikolaenko, V I / Olshevsky, A G / Ostrick, M / Padee, A / Panknin, R / Panzieri, D / Parsamyan, B / Paul, S / Pawlukiewicz-Kaminska, B / Perevalova, E / Pesaro, G / Peshekhonov, D V / Piragino, G / Platchkov, S / Pochodzalla, J / Polak, J / Polyakov, V A / Pontecorvo, G / Pretz, J / Quintans, C / Rajotte, J-F / Ramos, S / Rapatsky, V / Reicherz, G / Reggiani, D / Richter, A / Robinet, F / Rocco, E / Rondio, E / Ryabchikov, D I / Samoylenko, V D / Sandacz, A / Santos, H / Sapozhnikov, M G / Sarkar, S / Savin, I A / Sbrizzai, G / Schiavon, P / Schill, C / Schlüter, T / Schmitt, L / Schopferer, S / Schröder, W / Shevchenko, O Yu / Siebert, H-W / Silva, L / Sinha, L / Sissakian, A N / Slunecka, M / Smirnov, G I / Sosio, S / Sozzi, F / Srnka, A / Stolarski, M / Sulc, M / Sulej, R / Takekawa, S / Tessaro, S / Tessarotto, F / Teufel, A / Tkatchev, L G / Uhl, S / Uman, I / Venugopal, G / Virius, M / Vlassov, N V / Vossen, A / Weitzel, Q / Windmolders, R / Wiślicki, W / Wollny, H / Zaremba, K / Zavertyaev, M / Zemlyanichkina, E / Ziembicki, M / Zhao, J / Zhuravlev, N / Zvyagin, A

    Physical review letters

    2010  Band 104, Heft 24, Seite(n) 241803

    Abstract: The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π- π- π+ final state using a 190  GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420,000 events ... ...

    Abstract The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π- π- π+ final state using a 190  GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420,000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1  GeV2/c2. The well-known resonances a1(1260), a2(1320), and π2(1670) are clearly observed. In addition, the data show a significant natural-parity exchange production of a resonance with spin-exotic quantum numbers J(PC)=1-+ at 1.66  GeV/c2 decaying to ρπ. The resonant nature of this wave is evident from the mass-dependent phase differences to the J(PC)=2-+ and 1++ waves. From a mass-dependent fit a resonance mass of (1660±10(-64)(+0))  MeV/c2 and a width of (269±21(-64)(+42))  MeV/c2 are deduced, with an intensity of (1.7±0.2)% of the total intensity.
    Sprache Englisch
    Erscheinungsdatum 2010-06-18
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.104.241803
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Artikel: First measurement of the transverse spin asymmetries of the deuteron in semi-inclusive deep inelastic scattering.

    Alexakhin, V Yu / Alexandrov, Yu / Alexeev, G D / Amoroso, A / Badełek, B / Balestra, F / Ball, J / Baum, G / Bedfer, Y / Berglund, P / Bernet, C / Bertini, R / Birsa, R / Bisplinghoff, J / Bradamante, F / Bravar, A / Bressan, A / Burtin, E / Bussa, M P /
    Cerini, L / Chapiro, A / Cicuttin, A / Colantoni, M / Colavita, A A / Costa, S / Crespo, M L / d'Hose, N / Dalla Torre, S / Dasgupta, S S / De Masi, R / Dedek, N / Denisov, O Yu / Dhara, L / Diaz Kavka, V / Dolgopolov, A V / Donskov, S V / Dorofeev, V A / Doshita, N / Duic, V / Dünnweber, W / Efremov, A / Ehlers, J / Eversheim, P D / Eyrich, W / Fabro, M / Faessler, M / Fauland, P / Ferrero, A / Ferrero, L / Finger, M / Fischer, H / Franz, J / Friedrich, J M / Frolov, V / Fuchs, U / Garfagnini, R / Gautheron, F / Gavrichtchouk, O P / Gerassimov, S / Geyer, R / Giorgi, M / Gobbo, B / Goertz, S / Grajek, O A / Grasso, A / Grube, B / Grünemaier, A / Gustafsson, K / Hannappel, J / von Harrach, D / Hasegawa, T / Hedicke, S / Heinsius, F H / Hinterberger, F / von Hodenberg, M / Horikawa, N / Horikawa, S / Ijaduola, R B / Ilgner, C / Ishimoto, S / Iwata, T / Jahn, R / Janata, A / Joosten, R / Jouravlev, N I / Kabuss, E / Kalinnikov, V / Kang, D / Karstens, F / Kastaun, W / Ketzer, B / Khaustov, G V / Khokhlov, Yu A / Kisselev, Yu / Klein, F / Koivuniemi, J H / Kolosov, V N / Komissarov, E V / Kondo, K / Königsmann, K / Konoplyannikov, A K / Konorov, I / Konstantinov, V F / Korentchenko, A S / Korzenev, A / Kotzinian, A M / Koutchinski, N A / Kowalik, K / Kravchuk, N P / Krivokhizhin, G V / Kroumchtein, Z V / Kuhn, R / Kunne, F / Kurek, K / Lamanna, M / Le Goff, J M / Leberig, M / Lichtenstadt, J / Maggiora, A / Maggiora, M / Magnon, A / Mallot, G K / Manuilov, I V / Marchand, C / Marroncle, J / Martin, A / Marzec, J / Matsuda, T / Maximov, A N / Medved, K S / Meyer, W / Mielech, A / Mikhailov, Yu V / Moinester, M A / Nähle, O / Nassalski, J / Neyret, D P / Nikolaenko, V I / Nozdrin, A A / Obraztsov, V F / Olshevsky, A G / Ostrick, M / Padee, A / Pagano, P / Panebianco, S / Panzieri, D / Paul, S / Pereira, H D / Peshekhonov, D V / Peshekhonov, V D / Piragino, G / Platchkov, S / Platzer, K / Pochodzalla, J / Polyakov, V A / Popov, A A / Pretz, J / Rebourgeard, P C / Reicherz, G / Reymann, J / Rozhdestvensky, A M / Rondio, E / Sadovski, A B / Saller, E / Samoylenko, V D / Sandacz, A / Sans, M / Sapozhnikov, M G / Savin, I A / Schiavon, P / Schmidt, T / Schmitt, H / Schmitt, L / Shishkin, A A / Siebert, H / Sinha, L / Sissakian, A N / Skachkova, A / Slunecka, M / Smirnov, G I / Sugonyaev, V P / Stinzing, F / Sulej, R / Takabayashi, N / Tchalishev, V V / Tessarotto, F / Teufel, A / Thers, D / Tkatchev, L G / Toeda, T / Tretyak, V I / Trousov, S / Vlassov, N V / Webb, R / Weise, E / Wiesmann, M / Windmolders, R / Wirth, S / Wiślicki, W / Zanetti, A M / Zaremba, K / Zhao, J / Ziegler, R / Zvyagin, A

    Physical review letters

    2005  Band 94, Heft 20, Seite(n) 202002

    Abstract: First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon ... ...

    Abstract First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. The Collins asymmetry turns out to be compatible with zero, as does the measured Sivers asymmetry within the present statistical errors.
    Sprache Englisch
    Erscheinungsdatum 2005-05-27
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.94.202002
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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