Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 44
Primeira ... 123 ... Última
Imagem não selecionada

Imprime registro no formato completo
A clinical gamma camera-based pinhole collimated system for high resolution small animal SPECT imaging BJMBR
Mejia,J.; Galvis-Alonso,O.Y.; Castro,A.A.de; Braga,J.; Leite,J.P.; Simões,M.V..
The main objective of the present study was to upgrade a clinical gamma camera to obtain high resolution tomographic images of small animal organs. The system is based on a clinical gamma camera to which we have adapted a special-purpose pinhole collimator and a device for positioning and rotating the target based on a computer-controlled step motor. We developed a software tool to reconstruct the target’s three-dimensional distribution of emission from a set of planar projections, based on the maximum likelihood algorithm. We present details on the hardware and software implementation. We imaged phantoms and heart and kidneys of rats. When using pinhole collimators, the spatial resolution and sensitivity of the imaging system depend on parameters such as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pinhole collimator; SPECT; Small animal organs; Maximum likelihood; Instrumentation; Image processing.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001200004
Imagem não selecionada

Imprime registro no formato completo
A smartphone-based apple yield estimation application using imaging features and the ANN method in mature period Scientia Agricola
Qian,Jianping; Xing,Bin; Wu,Xiaoming; Chen,Meixiang; Wang,Yan'an.
ABSTRACT: Apple yield estimation using a smartphone with image processing technology offers advantages such as low cost, quick access and simple operation. This article proposes distribution framework consisting of the acquisition of fruit tree images, yield prediction in smarphone client, data processing and model calculation in server client for estimating the potential fruit yield. An image processing method was designed including the core steps of image segmentation with R/B value combined with V value and circle-fitting using curvature analysis. This method enabled four parameters to be obtained, namely, total identified pixel area (TP), fitting circle amount (FC), average radius of the fitting circle (RC) and small polygon pixel area (SP). A...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Potential yield prediction model; Image processing; Mobile phone application development; Orchard precision management.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400273
Imagem não selecionada

Imprime registro no formato completo
AN INTELLIGENT COMPUTER VISION SYSTEM FOR VEGETABLES AND FRUITS QUALITY INSPECTION USING SOFT COMPUTING TECHNIQUES CIGR Journal
G, Narendra V.
The quality of food products is very important for the human health. The large population and the increased requirements of food products makes it difficult to arrive the desired quality. The quality inspection and sorting tons of fruits and vegetables manually is a slow, costly, and an inaccurate process. In this research a vision-based quality inspection and sorting system is developed, to increase the quality of food products. The quality inspection and sorting process depends on capturing the image of the fruits/vegetables, analyzing captured image to discard defected products in order to identify the good or bad. Four different systems for different food products have been developed namely, Orange, Lemon, Sweet Lime, and Tomato. A dataset of 1200...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agriculture and Food quality evaluation; Image processing; Compter Vision; Soft computing Techniques Quality Inspection of fruits and Vegetables; Back propagation neural network; Probabilistic neural network..
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5188
Imagem não selecionada

Imprime registro no formato completo
Análise do tamanho e distância entre fragmentos florestais na bacia hidrográfica do Rio Una Ciências Agrárias
Catelani, Celso de Souza; Batista, Getulio Teixeira.
This article characterized the forest fragments of Una River hydrographic basin, affluent of the Paraíba do Sul River. Results showed that the average mean size of all fragments is 9.06 ha and that the correlation to the circular shape is 0.68 and the mean nucleus area of fragments considering a border effect of 60m is 5.86 ha. The mean distance among them is 245m. These parameters indicate that this basin has elongated fragments, with high border effect and may be in risk of biodiversity erosion. The image showing the different size classes of fragments allowed spatial observation of critical areas of the basin in ecological sustainability risk. The computing tools proved to be useful and easy to use as long as a previous georeferenced data basis is...
Tipo: Article Palavras-chave: Remote sensing; Image processing; SIG processamento de imagens sensoriamento remoto GIS.
Ano: 2007 URL: http://hdl.handle.net/2315/84
Imagem não selecionada

Imprime registro no formato completo
Análisis espacio-temporal del paisaje en la microcuenca dos afonsos - municipio de redençao da serra - Sp Ciências Agrárias
Biffi, Pedro Victor Barreto; Rossin, Sergio; Valerio, Mario.
In this project "space-temporary Analysis of the landscape in the basin Dos Afonsos" was analyzed the patterns of change of use of the soils and the fragmentation of the wood, located in the basin Dos Afonsos, and inside the limits of the Redençao da Serra district that belongs to the Região do Vale do Paraíba-SP state. For it a was carried out an multitemporal analyzed on an area approximated of 6802,59 of hectares, using for that program SPRING, for the image of Landsat processing of the followings years 1984, 1994, 2005 and the images of CBERS of the 2005 years The analysis of detection of changes was made for the followings classes: Lake - Lagoon, Macrophytes, Wood, Grass, degraded Grass, implanted Grass, Burned, reforests and Bare soils. Concluding...
Tipo: Article Palavras-chave: Remote sensing; Soils; Processamento de imagens; Sensoriamento remoto; The basin; Image processing.
Ano: 2007 URL: http://hdl.handle.net/2315/111
Imagem não selecionada

Imprime registro no formato completo
Aplicação de imagens hiperespectrais na detecção de fungos e na predição de micotoxinas em grãos de trigo. Infoteca-e
BARBEDO, J. G. A.; TIBOLA, C. S.; LIMA, M. I. P. M..
Estado da arte da detecção de doenças e micotoxinas em grãos de trigo utilizando imagens hiperespectrais. Métodos rápidos para detecção de giberela e predição do nível de DON. Discussão, tendências e perspectivas. Conclusões.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Espectroscopia de infravermelho próximo; Deoxinivalenol; Doenças em trigo; Detecção de giberela; Processamento de imagem; Imagens hiperespectrais; Image processing; Trigo; Micotoxina; Doença de Planta; Near-infrared spectroscopy; Wheat; Mycotoxins; Image analysis; Plant diseases and disorders.
Ano: 2018 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1110202
Imagem não selecionada

Imprime registro no formato completo
Application of x-ray computed tomography in the evaluation of soil porosity in soil management systems REA
Beraldo,José M. G.; Scannavino Junior,Francisco de A.; Cruvinel,Paulo E..
The study aimed to evaluate a methodology to quantify the porosity of the soil using computed tomography in areas under no-tillage, conventional tillage and native forest. Three soil management systems were selected for the study: forest, conventional tillage and no-tillage. In each soil management system, undisturbed soil samples were collected in the surface layer (0.0 to 0.10 m). The tomographic images were obtained using a X-ray microtomography. After obtaining the images, they were processed, and a methodology was evaluated for image conversion into numerical values. The statistical method which provided the greatest accuracy was the percentile method. The methodology used to analyze the tomographic image allowed quantifying the porosity of the soil...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Precision farming; Image processing; X-ray microtomography; Macroporosity.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600012
Imagem não selecionada

Imprime registro no formato completo
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil Anais da ABC (AABC)
BENITES,SUSANA; SOMMER,CARLOS A.; LIMA,EVANDRO F. DE; SAVIAN,JAIRO F.; HAAG,MAURICIO B.; MONCINHATTO,THIAGO R.; TRINDADE,RICARDO I.F. DA.
Abstract The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were first identified using remote sensing and then correlated with flow structures observed in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anisotropy of Magnetic Susceptibility; Image processing; Silicic lavas; Volcanic morphologies.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000300601
Imagem não selecionada

Imprime registro no formato completo
Comparing two technologies for quantifying rice plant cover in breeding nurseries International Rice Research Institute
Caton, B. P.; Navarez, D. C.; Cope, A. E..
p.70-71
Palavras-chave: Growth; Leaf area index; Canopy; Photography; Image processing.
Ano: 2004 URL: http://hdl.handle.net/123456789/865
Imagem não selecionada

Imprime registro no formato completo
Design of a three-dimensional hand/forearm model to apply computational fluid dynamics BABT
Marinho,Daniel Almeida; Reis,Victor Machado; Vilas-Boas,João Paulo; Alves,Francisco Bessone; Machado,Leandro; Rouboa,Abel Ilah; Silva,António José.
The purpose of this study was to develop a three-dimensional digital model of a human hand and forearm to apply Computational Fluid Dynamics to propulsion analysis in swimming. Computer tomography scans of the hand and forearm of an Olympic swimmer were applied. The data were converted, using image processing techniques, into relevant coordinate input, which could be used in Computational Fluid Dynamics software. From that analysis, it was possible to verify an almost perfect agreement between the true human segment and the digital model. This technique could be used as a means to overcome the difficulties in developing a true three-dimensional model of a specific segment of the human body. Additionally, it could be used to improve the use of Computational...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Finite element modelling; Image processing; Computational fluid dynamics; Biomechanics; Swimming.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000200024
Imagem não selecionada

Imprime registro no formato completo
DEVELOPMENT OF A COMPUTATIONAL TOOL TO IDENTIFY NUTRITIONAL DEFICIENCIES IN CURUBA PLANTS (Passiflora tripartita var. molissima) CIGR Journal
Roa Guerrero, Edgar Eduardo.
Nowadays, the determination of nutritional deficiencies in plants has become one of the most important analysis of crop growth. Often, this analysis is performed manually by specialized personnel for long period of time, leading to an error in the procedure. The purpose of this research is to develop a computational tool for the identification of nutritional deficiencies such as Nitrogen, Potassium and Phosphorus in Curuba plants. The methodology includes 3D designs, tool construction and the detection of nutritional deficiencies by image processing techniques in MatLab. Finally, the results obtained by the developed computational tool with respect to the data provided in a traditional way by the technical experts, presented an accuracy of 100%, 80%, 91%...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Image processing; Identification of nutritional deficiencies in plants Nutritional deficiencies; Growth indices; Computational tool.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4335
Imagem não selecionada

Imprime registro no formato completo
DEVELOPMENT OF A TRANSFER FUNCTION FOR WEIGHT PREDICTION OF LIVE BROILER CHICKEN USING MACHINE VISION REA
Amraei,Somaye; Mehdizadeh,Saman A.; Nääs,Irenilza de A..
ABSTRACT The objective of this study was to process digital images to investigate the possibility of broilers body weight estimation based on the dynamic model. For this experiment, 2440 images were recorded by a top-view camera from 30 birds. An ellipse fitting algorithm was applied to localize chickens within the pen, by using a generalized Hough transform. Chickens’ head and tail were removed efficiently using the Chan-Vese method. After that, using image processing, six body measures were calculated. Next, they were used to design a Transform Function (TF) model with weight measurements as output. Second-order dynamic models were used to predict the weight of life broiler chicken, without delay, stable and with the highest R2 were predominantly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Automatic weight estimation; Image processing; Ellipse fitting; Transfer function modeling.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000500776
Imagem não selecionada

Imprime registro no formato completo
Development of an automatic chili drying controller based on computer vision CIGR Journal
Kanjanawanishkul, Kiattisin.
Color of dried chilies is one of the most key factors that influences consumers’ preference. It is mainly affected by the drying process. Traditionally, drying temperature is fixed during the drying process without regard to the quality of chilies being dried. Thus, the aim of this research is to develop a controller for the chili drying process that determines the drying temperature according to the change of chili color. To measure the chili color, we built a hot air tray dryer incorporated with a computer vision system which measures the chili color during drying. We converted the RGB color model to the L*a*b* color model and calculated the change of the a* component (\delta a). If \delta a within 15 minutes was less than 2, then, the drying temperature...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dried chili color; Image processing; Drying control; Closed-loop controlthe Higher Education Research Promotion and National Research University Project of Thailand Office of the Higher Education Commission.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5236
Imagem não selecionada

Imprime registro no formato completo
Directional short wind wave spectra derived from the sea surface photography ArchiMer
Yurovskaya, M. V.; Dulov, V. A.; Chapron, Bertrand; Kudryavtsev, V. N..
New field measurements of 2-D wave number short wind wave spectra in the wavelength range from few millimeters to few decimeters are reported and discussed. The measurement method is based on stereophotography and image brightness contrast processing. As found, the spectra of decimeter waves are almost isotropic and weakly dependent on the wind speed. Both directional anisotropy and wind sensitivity rapidly increase at wave numbers larger than 100 rad/m. These aspects are consistent with other previously reported optical and radar data. Following these new in situ measurements, a revision of a semiempirical model of short wind wave spectrum is suggested. This revised model can readily be implemented in other studies (radar scattering, air-sea interaction...
Tipo: Text Palavras-chave: Wave directional spectrum; Field measurements; Spectrum modeling; Gravity-capillary waves; Image processing.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00164/27566/25927.pdf
Imagem não selecionada

Imprime registro no formato completo
Dynamique sédimentaire multiclasse : de l’étude des processus à la modélisation en Manche ArchiMer
Blanpain, Olivier.
The purpose of this work is the implementation of a sediment transport model in the English Channel. The design of such a model requires the identification of the physical processes, their modelling and their in-situ validation. Because of the sedimentary particularities of the study area, modelling of the mechanical behaviour of a non uniform mixture of sediments and particularly of the fine grains within a coarse matrix is required. This study focused on the characterization of the relevant processes by acquisition of experimental and in-situ data. Data acquired in hydro-sedimentary conditions comparable to those found in the English Channel are scarce. A new instrument and image processing technique were specifically conceived and implemented in-situ to...
Tipo: Text Palavras-chave: Manche; Sédiment multiclasse; Modélisation numérique; Morphodynamique; Charriage; Tri sédimentaire; Mesures in-situ; Traitement d’images; Mesures en canal; English Channel; Graded sediment; Numerical modelling; Morphodynamics; Bedload; Sediment sorting; In-situ data; Image processing; Flume experiments.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00003/11426/7962.pdf
Imagem não selecionada

Imprime registro no formato completo
Hábitats del golfo de Ana María identificados mediante el empleo de procesamiento digital de imágenes OceanDocs
Ventura Díaz, Y.; Rodríguez Cueto, Y..
Durante los meses de octubre de 2011 y abril de 2012 se llevaron a cabo expediciones al golfo de Ana María para realizar una caracterización del mismo. En dichas expediciones se tomaron como referencia una serie de estaciones de muestreo que sirvieron de base para el levantamiento de campo realizado. Este trabajo tiene como objetivo elaborar una primera versión del mapa de los hábitats marinos del golfo de Ana María, usando el procesamiento digital de imágenes y el muestreo de campo mediante el empleo de sitio de muestreo. Para el cumplimiento del objetivo se tuvo en cuenta la información de los fondos obtenidos en las clasificaciones realizadas para las áreas protegidas, Refugio de Fauna Cayos Ana María y Refugio de Fauna Macurije-Santa María, las...
Tipo: Journal Contribution Palavras-chave: Image processing; Maps; Site investigation.
Ano: 2012 URL: http://hdl.handle.net/1834/4634
Imagem não selecionada

Imprime registro no formato completo
Identifying drought events in sugarcane using drought indices derived from Modis sensor PAB
Picoli,Michelle Cristina Araujo; Duft,Daniel Garbellini; Machado,Pedro Gerber.
Abstract: The objective of this work was to evaluate the potential of several spectral indices, used on moderate resolution imaging spectroradiometer (Modis) images, in identifying drought events in sugarcane. Images of Terra and Aqua satellites were used to calculate the spectral indices, using visible (red), near infrared, and shortwave infrared bands, and eight indices were selected: NDVI, EVI2, GVMI, NDI6, NDI7, NDWI, SRWI, and MSI. The indices were calculated using images between October and April of the crop years 2007/08, 2008/09, 2009/10, and 2013/14. These indices were then correlated with the standardized precipitation-evapotranspiration index (SPEI), calculated for 1, 3, and 6 months. Four of them had significant correlations with SPEI: GVMI,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Saccharum officinarum; Drought stress; Image processing; Satellite imagery; SPEI; Warning systems.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001101063
Imagem não selecionada

Imprime registro no formato completo
Image analysis for assessing broiler breeder behavior response to thermal environment REA
Nääs,Irenilza de A.; Laganá,Marcus; Mollo Neto,Mario; Canuto,Simone; Pereira,Danilo F..
The research proposes a methodology for assessing broiler breeder response to changes in rearing thermal environment. The continuous video recording of a flock analyzed may offer compelling evidences of thermal comfort, as well as other indications of welfare. An algorithm for classifying specific broiler breeder behavior was developed. Videos were recorded over three boxes where 30 breeders were reared. The boxes were mounted inside an environmental chamber were ambient temperature varied from cold to hot. Digital images were processed based on the number of pixels, according to their light intensity variation and binary contrast allowing a sequence of behaviors related to welfare. The system used the default of x, y coordinates, where x represents the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal welfare; Image processing; Clusters analysis.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000400001
Imagem não selecionada

Imprime registro no formato completo
Improving field management by machine vision - a review CIGR Journal
Taghadomi-Saberi, Saeedeh; Hemmat, Abbas.
Growing population of people around the world and thus increasing demand to food products as well as high tendency for declining the cost of operations and environmental preserving cares intensify inclination toward the application of variable rate systems for agricultural treatments, in which machine vision as a powerful appliance has been paid vast attention by agricultural researchers and farmers as this technology consumers. Various applications have introduced for machine vision in different fields of agricultural and food industry till now that confirms the high potential of this approach for inspection of different parameters affecting productivity. Computer vision has been utilized for quantification of factors affecting crop growth in field; such...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biosystems engineering Precision agriculture; Field management; Image processing; Variable rate.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3250
Imagem não selecionada

Imprime registro no formato completo
Introdução à visão computacional e ao processamento de imagens com OpenCV: Módulo I - processamento de imagens. Infoteca-e
EMBRAPA INFORMÁTICA AGROPECUÁRIA..
Objetivo. Programação. Público-alvo e requisitos. Ministrante. Organização.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Visão computacional; Biblioteca de software de código aberto OpenCV; Processamento de imagens; Image processing; Computer vision.
Ano: 2011 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/921243
Registros recuperados: 44
Primeira ... 123 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional