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14 results on '"exposition time"'

2. Efeitos da perspectiva na amplificação dos tamanhos de objetos que interceptam a linha do horizonte Effects of perspective on the amplification of object sizes that intercept the horizon line

Author

Nelson Torro-Alves, Adriana do Vale Ferreira, Leonardo Gomes Bernardino, and Sérgio Sheiji Fukusima

Subjects
Percepção visual, tamanho relativo, indícios pictóricos de profundidade, horizonte, tempo de exposição, Visual perception, relative size, pictorial depth cues, horizon, exposition time, Psychology, BF1-990
Abstract

Foram investigados os efeitos do gradiente de textura e da posição do estímulo teste com relação à linha do horizonte na percepção de tamanho relativo. Pelo método das escadas duplas, cinquenta voluntários ajustaram o tamanho de uma barra apresentada acima, abaixo ou no nível do horizonte para que fosse percebida do mesmo tamanho que uma barra apresentada no campo visual inferior. Os estímulos foram apresentados por 100ms sobre cinco fundos de tela. O gradiente de perspectiva contribuiu mais para a superestimação de tamanho relativo que o gradiente de compressão. Os tamanhos dos objetos que interceptavam a linha do horizonte foram superestimados. O sistema visual mostrou-se bastante eficaz em extrair informações de profundidade da perspectiva, fazendo-o mesmo em apresentações muito breves.We investigated the effects of texture gradient and the position of test stimulus in relation to the horizon on the perception of relative sizes. By using the staircase method, 50 participants adjusted the size of a bar presented above, below or on the horizon as it could be perceived in the same size of a bar presented in the lower visual field. Stimuli were presented during 100ms on five background conditions. Perspective gradient contributed more to the overestimation of relative sizes than compression gradient. The sizes of the objects which intercepted the horizon line were overestimated. Visual system was very effective in extracting information from perspective depth cues, making it even during very brief exposure.

Published
2012
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3. Radiative Pion Photoproduction from the Proton and π + Meson Polarizabilities

Author

Ahrens, J., Alekseyev, V., Arends, J., Beck, R., Cherepnya, S., Drechsel, D., Fil’kov, L., Hardy, P., Kashevarov, V., Krusche, B., McGeorge, C., Metag, V., Owens, R., Peise, J., Ströher, H., Walcher, Th., Mitter, H., editor, Plessas, W., editor, Adam, J., editor, Dobeš, J., editor, Mach, R., editor, Sotona, M., editor, and Dolejší, J., editor

Published
1996
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5. Efeitos da Perspectiva na Amplificação dos Tamanhos de Objetos que Interceptam a Linha do Horizonte.

Author

Torro-Alves, Nelson, do Vale Ferreira, Adriana, Bernardino, Leonardo Gomes, and Fukusima, Sérgio Sheiji

Subjects
VISUAL perception, VISUAL learning, ESTIMATION theory, DATA mining, PROMPTS (Psychology)
Abstract

Copyright of Psicologia: Reflexão e Critica is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2012
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7. Estudio hemodinámico mediante simulación numérica para completar el diagnóstico en estenosis carotídeas tributarias de endarterectomía

Author

Rivera Amores, Juan José, Arias Araluce, Fausto Arturo, Badrenas, A., Grau, J., Rivera Amores, Juan José, Arias Araluce, Fausto Arturo, Badrenas, A., and Grau, J.

Abstract

Introducción En pacientes con estenosis carotídeas sintomáticas moderadas o asintomáticas severas, antes de realizar una endarterectomía se recomienda hacer un estudio detallado en que se incluya el mayor número posible de parámetros morfológicos y hemodinámicos. Este trabajo analiza el efecto que la localización y la forma de la estenosis tienen sobre la distribución de las tensiones de cizallamiento y su repercusión en el diagnóstico clínico en estos casos. Materiales y métodos Se genera el modelo de la zona objeto de estudio y se realiza la simulación numérica. Se determinan las tensiones de cizallamiento, el índice de oscilación y el tiempo de exposición a dichas tensiones, y se analiza el riesgo de embolización o de crecimiento de la placa arterial. Se aplica la metodología a 3 carótidas idealizadas con diferente localización y pendiente de la estenosis y a un caso clínico. Resultados Para las carótidas idealizadas, se obtiene que la estenosis cercana a la bifurcación presenta un riesgo de embolización superior a la más alejada y tanto más riesgo cuanto más pendiente tiene la estenosis. Para el caso clínico, los resultados indican un riesgo alto de embolización por rotura cerca de la placa ateromatosa. Asimismo, también se concluye que el riesgo de que la placa continúe progresando es bajo. Conclusiones Los resultados obtenidos muestran que la localización de una estenosis moderada en relación con la bifurcación carotídea y su forma geométrica son factores que es bueno conocer para completar el diagnóstico y el pronóstico de la lesión., Introduction In patients with moderate symptomatic or severe asymptomatic carotid stenosis, prior to an endarterectomy it is recommended to do a detailed study, in which the complet set of morphological and hemodynamic parameters are included. In this work the effect that the location and shape of the stenosis has on the distribution of wall shear stresses and their impact on clinical diagnosis in these cases is analyzed. Materials and methods First the model of the area to study is generated and the numerical simulation is done. Then the wall shear stress, the oscilation index and the wall shear stress exposure time are established, and the impact of the results for embolization risk or the growth of arterial plaque because of intimal hiperpasia are analysed. The methodology is applied to three idealized carotids with different localization and geometrical slope of the stenosis. Results For the idealized carotids it is obtained that stenosis close to bifurcation present a higher embolization risk that the most distant one and has more risk as more stenosis slope it has. For the clinical case, the results show a high risk of embolization by break located near the atheromatous plaque. As well, it is obtained that the risk the arterial plaque to continue growing is low. Conclusions The results show that the location of a moderate stenosis related to carotid bifurcation and their geometry they are factors that aid to complete the diagnosis of lesion., Peer Reviewed

Published
2016

8. Efeitos da perspectiva na amplificação dos tamanhos de objetos que interceptam a linha do horizonte

Author

Adriana do Vale Ferreira, Leonardo Gomes Bernardino, Nelson Torro-Alves, and Sérgio Sheiji Fukusima

Subjects
Percepção visual, relative size, horizonte, exposition time, Visual perception, tamanho relativo, pictorial depth cues, Psychology, Humanities, General Psychology, indícios pictóricos de profundidade, tempo de exposição, horizon
Abstract

Foram investigados os efeitos do gradiente de textura e da posição do estímulo teste com relação à linha do horizonte na percepção de tamanho relativo. Pelo método das escadas duplas, cinquenta voluntários ajustaram o tamanho de uma barra apresentada acima, abaixo ou no nível do horizonte para que fosse percebida do mesmo tamanho que uma barra apresentada no campo visual inferior. Os estímulos foram apresentados por 100ms sobre cinco fundos de tela. O gradiente de perspectiva contribuiu mais para a superestimação de tamanho relativo que o gradiente de compressão. Os tamanhos dos objetos que interceptavam a linha do horizonte foram superestimados. O sistema visual mostrou-se bastante eficaz em extrair informações de profundidade da perspectiva, fazendo-o mesmo em apresentações muito breves. We investigated the effects of texture gradient and the position of test stimulus in relation to the horizon on the perception of relative sizes. By using the staircase method, 50 participants adjusted the size of a bar presented above, below or on the horizon as it could be perceived in the same size of a bar presented in the lower visual field. Stimuli were presented during 100ms on five background conditions. Perspective gradient contributed more to the overestimation of relative sizes than compression gradient. The sizes of the objects which intercepted the horizon line were overestimated. Visual system was very effective in extracting information from perspective depth cues, making it even during very brief exposure.

Published
2012

10. Metody zvýšení dynamického rozsahu obrazu

Author

Koutný, Jiří, Juránek, Roman, Sailer, Zbyněk, Koutný, Jiří, Juránek, Roman, and Sailer, Zbyněk

Abstract

Tato práce se zabývá problémem dynamického rozsahu snímačů digitálních fotoaparátů a metodami řešení tohoto problému. Jsou zde popsány existující metody tvorby obrazu s vysokým dynamickým rozsahem, způsoby získávání vstupních dat a nový způsob tvorby HDR obrazu - takzvané přímé generování., This thesis deals with dynamic range of digital cameras sensors problem and methods for solving this problem. There are described the existing methods of high dynamic range image creation, the techniques of obtaining the input data and a new method of creation of HDR image - so-called direct generation.

11. Metody zvýšení dynamického rozsahu obrazu

Author

Koutný, Jiří, Juránek, Roman, Koutný, Jiří, and Juránek, Roman

Abstract

Tato práce se zabývá problémem dynamického rozsahu snímačů digitálních fotoaparátů a metodami řešení tohoto problému. Jsou zde popsány existující metody tvorby obrazu s vysokým dynamickým rozsahem, způsoby získávání vstupních dat a nový způsob tvorby HDR obrazu - takzvané přímé generování., This thesis deals with dynamic range of digital cameras sensors problem and methods for solving this problem. There are described the existing methods of high dynamic range image creation, the techniques of obtaining the input data and a new method of creation of HDR image - so-called direct generation.

12. Metody zvýšení dynamického rozsahu obrazu

Author

Koutný, Jiří, Juránek, Roman, Koutný, Jiří, and Juránek, Roman

Abstract

Tato práce se zabývá problémem dynamického rozsahu snímačů digitálních fotoaparátů a metodami řešení tohoto problému. Jsou zde popsány existující metody tvorby obrazu s vysokým dynamickým rozsahem, způsoby získávání vstupních dat a nový způsob tvorby HDR obrazu - takzvané přímé generování., This thesis deals with dynamic range of digital cameras sensors problem and methods for solving this problem. There are described the existing methods of high dynamic range image creation, the techniques of obtaining the input data and a new method of creation of HDR image - so-called direct generation.

13. Metody zvýšení dynamického rozsahu obrazu

Author

Koutný, Jiří, Juránek, Roman, Koutný, Jiří, and Juránek, Roman

Abstract

Tato práce se zabývá problémem dynamického rozsahu snímačů digitálních fotoaparátů a metodami řešení tohoto problému. Jsou zde popsány existující metody tvorby obrazu s vysokým dynamickým rozsahem, způsoby získávání vstupních dat a nový způsob tvorby HDR obrazu - takzvané přímé generování., This thesis deals with dynamic range of digital cameras sensors problem and methods for solving this problem. There are described the existing methods of high dynamic range image creation, the techniques of obtaining the input data and a new method of creation of HDR image - so-called direct generation.

14. Estudio hemodinámico mediante simulación numérica para completar el diagnóstico en estenosis carotídeas tributarias de endarterectomía

Author

J. Grau, J. Rivera, F. Arias, A. Badrenas, Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria, Universitat Politècnica de Catalunya. LITEM - Laboratori per a la Innovació Tecnològica d'Estructures i Materials, and Fundació Althaia

Subjects
medicine.medical_specialty, medicine.medical_treatment, Artèries -- Malalties, Hemodynamics, Intimal hyperplasia, Numerical simulation, Hiperplasia de la íntima, 030218 nuclear medicine & medical imaging, Matemàtiques i estadística::Anàlisi numèrica [Àrees temàtiques de la UPC], Tensión de cizallamiento en la pared arterial, 03 medical and health sciences, Embolization, Wall shear stress, 0302 clinical medicine, Simulación numérica, Internal medicine, Tributary, medicine, Carotid stenosis, Exposition time, Índice de oscilación, Engineering(all), Endarterectomy, Simulació, Mètodes de, Anàlisi numèrica, geography, geography.geographical_feature_category, business.industry, Applied Mathematics, General Engineering, medicine.disease, Simulation methods, Carotid artery--Stenosis, Stenosis, Embolización Estenosis carotídea Hiperplasia de la íntima Índice de oscilación Simulación numérica Tensión de cizallamiento en la pared arterial Tiempo de exposición, Tiempo de exposición, Cardiology, Estenosis carotídea, Oscillatory shear index, business, Embolización, 030217 neurology & neurosurgery, Numerical analysis, Ciències de la salut [Àrees temàtiques de la UPC]
Abstract

Introducción En pacientes con estenosis carotídeas sintomáticas moderadas o asintomáticas severas, antes de realizar una endarterectomía se recomienda hacer un estudio detallado en que se incluya el mayor número posible de parámetros morfológicos y hemodinámicos. Este trabajo analiza el efecto que la localización y la forma de la estenosis tienen sobre la distribución de las tensiones de cizallamiento y su repercusión en el diagnóstico clínico en estos casos. Materiales y métodos Se genera el modelo de la zona objeto de estudio y se realiza la simulación numérica. Se determinan las tensiones de cizallamiento, el índice de oscilación y el tiempo de exposición a dichas tensiones, y se analiza el riesgo de embolización o de crecimiento de la placa arterial. Se aplica la metodología a 3 carótidas idealizadas con diferente localización y pendiente de la estenosis y a un caso clínico. Resultados Para las carótidas idealizadas, se obtiene que la estenosis cercana a la bifurcación presenta un riesgo de embolización superior a la más alejada y tanto más riesgo cuanto más pendiente tiene la estenosis. Para el caso clínico, los resultados indican un riesgo alto de embolización por rotura cerca de la placa ateromatosa. Asimismo, también se concluye que el riesgo de que la placa continúe progresando es bajo. Conclusiones Los resultados obtenidos muestran que la localización de una estenosis moderada en relación con la bifurcación carotídea y su forma geométrica son factores que es bueno conocer para completar el diagnóstico y el pronóstico de la lesión. Introduction In patients with moderate symptomatic or severe asymptomatic carotid stenosis, prior to an endarterectomy it is recommended to do a detailed study, in which the complet set of morphological and hemodynamic parameters are included. In this work the effect that the location and shape of the stenosis has on the distribution of wall shear stresses and their impact on clinical diagnosis in these cases is analyzed. Materials and methods First the model of the area to study is generated and the numerical simulation is done. Then the wall shear stress, the oscilation index and the wall shear stress exposure time are established, and the impact of the results for embolization risk or the growth of arterial plaque because of intimal hiperpasia are analysed. The methodology is applied to three idealized carotids with different localization and geometrical slope of the stenosis. Results For the idealized carotids it is obtained that stenosis close to bifurcation present a higher embolization risk that the most distant one and has more risk as more stenosis slope it has. For the clinical case, the results show a high risk of embolization by break located near the atheromatous plaque. As well, it is obtained that the risk the arterial plaque to continue growing is low. Conclusions The results show that the location of a moderate stenosis related to carotid bifurcation and their geometry they are factors that aid to complete the diagnosis of lesion.

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