1,721,182 research outputs found
Multispectral image acquisition and processing focused on color reproduction and correction in controlled lighting environments.
No full textgraficas, ilustraciones, tablasEsta tesis presenta la validación del funcionamiento y calibración de una nueva versión de un sistema imágenes multiespectrales que utiliza un sensor de cámara de amplio espectro (400-1000nm), y tecnología de iluminación basada en LED de ancho de banda estrecha dentro del espectro visible (410,650nm). Esta versión consta de una cámara monocromática de amplio espectro que se adaptó a varios lentes para realizar diferentes tomas y pruebas. Cuenta con un entorno de iluminación controlado con forma de caja octagonal oscura y cerrada. Dentro de ella se encuentran cuatro módulos, cada uno de ellos con 8 tríos de LEDs de alta potencia con ancho de banda estrecho en diversas longitudes de onda, que incluyen 7 dentro del espectro visible y 1 en el infrarrojo cercano que toma el rango de 410-850nm. El propósito de esta tesis es presentar un sistema multiespectral para adquirir la información intrínseca del color de las imágenes en un entorno de iluminación controlado como sistema de medida de color. Para ello, es necesario caracterizar y calibrar el sistema; y adecuar la configuración de los parámetros del sensor/lente. Además, se presentan las comparaciones respectivas de los sistemas para medir su precisión y exactitud. Como resultado del proceso de captura, se generan 8 imágenes multiespectrales que contienen información correspondiente a cada una de las longitudes de onda disponibles en cada sistema. Con el fin de evitar problemas de saturación, contraste, etc; se realiza la calibración y el estudio de repetibilidad del sistema. Además, se realiza la optimización en el software del sistema para corregir errores y ajustar el color respecto a la referencia según el CIE (Comission Internationale de l´Eclairage). Para ello, se aplican técnicas de regresión lineal, no lineal y una red neuronal. La capacidad del sistema para reproducir color a partir de imágenes espectrales genera como resultado una distancia de color de 23,74 Delta E y 40,45 Delta E cuando se utiliza la primera versión, la Corona Multiespectral y la segunda, el Domo Multiespectral, respectivamente. Utilizando el mejor entre los método probados para la corrección de color (Red neuronal) los errores disminuyen hasta 3,31 Delta E y 2,22 Delta E cuando se utiliza la primera versión y la segunda, respectivamente (Texto tomado de la fuente)This thesis presents the validation of the operation and calibration of a new version of a multispectral image acquisition system using a wide spectrum (400-1000nm) camera sensor, and narrow bandwidth LED based illumination technology within the visible spectrum (410,650nm). This version consists of a broad spectrum monochromatic camera that was adapted to various lenses for different shots and tests. It has a controlled illumination environment in the shape of a dark, closed octagonal box. Inside it are four modules, each containing 8 trios of narrow bandwidth power LEDs of different wavelengths (7 within the visible spectrum and 1 in the near infrared) taking the range 410-850nm. The purpose of this thesis is to present a multispectral system for acquiring intrinsic color information from images in a controlled illumination environment as a color measurement system. For this purpose, it is necessary to characterize and calibrate the system; and to adapt the configuration of the sensor/lens parameters. In addition, the respective comparisons of the systems are presented to measure their precision and accuracy. As a result of the acquisition process, 8 multispectral images are obtained with information of each of the wavelengths available in each system. In order to avoid problems of saturation, contrast, etc., the calibration and repeatability study of the system is performed. In addition, the system software is optimized to correct errors and adjust the color with respect to the reference according to the Colorimetry Standard (CIE). For this purpose, linear and nonlinear regression techniques and a neural network are applied. The system's ability to reproduce color from spectral images results in a color distance of 23.74 Delta E and 40.45 Delta E when using the first version: Corona Multispectral and the second version: Dome Multispectral, respectively. Using the best among the proven methods for color correction (Neural Network) the errors decrease to 3.31 Delta E and 2.22 Delta E when using the first version and the second version, respectively.MaestríaMagíster en Ingeniería - Automatización IndustrialEléctrica, Electrónica, Automatización Y Telecomunicaciones.Sede Manizale
Multispectral image acquisition and processing focused on color reproduction and correction in controlled lighting environments.
No full textgraficas, ilustraciones, tablasEsta tesis presenta la validación del funcionamiento y calibración de una nueva versión de un sistema imágenes multiespectrales que utiliza un sensor de cámara de amplio espectro (400-1000nm), y tecnología de iluminación basada en LED de ancho de banda estrecha dentro del espectro visible (410,650nm). Esta versión consta de una cámara monocromática de amplio espectro que se adaptó a varios lentes para realizar diferentes tomas y pruebas. Cuenta con un entorno de iluminación controlado con forma de caja octagonal oscura y cerrada. Dentro de ella se encuentran cuatro módulos, cada uno de ellos con 8 tríos de LEDs de alta potencia con ancho de banda estrecho en diversas longitudes de onda, que incluyen 7 dentro del espectro visible y 1 en el infrarrojo cercano que toma el rango de 410-850nm. El propósito de esta tesis es presentar un sistema multiespectral para adquirir la información intrínseca del color de las imágenes en un entorno de iluminación controlado como sistema de medida de color. Para ello, es necesario caracterizar y calibrar el sistema; y adecuar la configuración de los parámetros del sensor/lente. Además, se presentan las comparaciones respectivas de los sistemas para medir su precisión y exactitud. Como resultado del proceso de captura, se generan 8 imágenes multiespectrales que contienen información correspondiente a cada una de las longitudes de onda disponibles en cada sistema. Con el fin de evitar problemas de saturación, contraste, etc; se realiza la calibración y el estudio de repetibilidad del sistema. Además, se realiza la optimización en el software del sistema para corregir errores y ajustar el color respecto a la referencia según el CIE (Comission Internationale de l´Eclairage). Para ello, se aplican técnicas de regresión lineal, no lineal y una red neuronal. La capacidad del sistema para reproducir color a partir de imágenes espectrales genera como resultado una distancia de color de 23,74 Delta E y 40,45 Delta E cuando se utiliza la primera versión, la Corona Multiespectral y la segunda, el Domo Multiespectral, respectivamente. Utilizando el mejor entre los método probados para la corrección de color (Red neuronal) los errores disminuyen hasta 3,31 Delta E y 2,22 Delta E cuando se utiliza la primera versión y la segunda, respectivamente (Texto tomado de la fuente)This thesis presents the validation of the operation and calibration of a new version of a multispectral image acquisition system using a wide spectrum (400-1000nm) camera sensor, and narrow bandwidth LED based illumination technology within the visible spectrum (410,650nm). This version consists of a broad spectrum monochromatic camera that was adapted to various lenses for different shots and tests. It has a controlled illumination environment in the shape of a dark, closed octagonal box. Inside it are four modules, each containing 8 trios of narrow bandwidth power LEDs of different wavelengths (7 within the visible spectrum and 1 in the near infrared) taking the range 410-850nm. The purpose of this thesis is to present a multispectral system for acquiring intrinsic color information from images in a controlled illumination environment as a color measurement system. For this purpose, it is necessary to characterize and calibrate the system; and to adapt the configuration of the sensor/lens parameters. In addition, the respective comparisons of the systems are presented to measure their precision and accuracy. As a result of the acquisition process, 8 multispectral images are obtained with information of each of the wavelengths available in each system. In order to avoid problems of saturation, contrast, etc., the calibration and repeatability study of the system is performed. In addition, the system software is optimized to correct errors and adjust the color with respect to the reference according to the Colorimetry Standard (CIE). For this purpose, linear and nonlinear regression techniques and a neural network are applied. The system's ability to reproduce color from spectral images results in a color distance of 23.74 Delta E and 40.45 Delta E when using the first version: Corona Multispectral and the second version: Dome Multispectral, respectively. Using the best among the proven methods for color correction (Neural Network) the errors decrease to 3.31 Delta E and 2.22 Delta E when using the first version and the second version, respectively.MaestríaMagíster en Ingeniería - Automatización IndustrialEléctrica, Electrónica, Automatización Y Telecomunicaciones.Sede Manizale
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
O Sistema de Rift Africano: Algumas considerações
No full textWhen we look to the world map of heat flow, we see in Africa regions with low heat flow values ( around 40 mW m-2) separated by regions where the heat flow values are higher ( 60 to 80 mW m-2).When we look to the geological map we can see, in the eastern zone of the map, one of the most extensive rifts on the Earth’s surface, extending from Jordan in south western Asia to Mozambique in south eastern Africa. The system is 6,400 Km long and averages 48 to 64 km wide, and consists of two branches. The main branch, the Eastern Rift Valley extends along the entire length of the system, from Jordan River and Dead Sea to Kenya and continues Southward through Mozambique Plain to the coast of the Indian Ocean near Beira. The western branch of the system extends northwards from the northern end of lake Nyasa in a great arc that includes several lakes. Most of these lakes are deep with their floors below sea level. The rift has an age of 30 million years.
This work represents an attempt to study this region using thermal data including heat flow data, thermal springs location and water temperature, seismicity data and temperature data collected at the bottom of the holes during drilling works
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