Image Artifacts
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. GeraÃÃo e avaliaÃÃo de artefatos em vÃdeo digital / Generation and evaluation of artifacts in digital video
Este trabalho teve como objetivo o estudo e a criaÃÃo controlada de artefatos em vÃdeo digital e a sua mensuraÃÃo com o emprego de mÃtricas objetivas. Foram criados artefatos do tipo ruÃdo branco gaussiano, sal e pimenta, borramento, blocagem e travamento. Para avaliaÃÃo de seu impacto no vÃdeo digital foram utilizadas as mÃtricas MSE (Mean Square
Publicado em: 2009
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14. Autoria de objetos digitais complexos baseada em documentos através da anotação semântica de conteúdo / Document-based authoring of complex digital object through semantic annotation of content
Complex digital objects bring together many types of digital artifacts (e.g., text, image, audio etc.), and are usually composed of content artifacts and metadata which describe, relate and organize them. When interoperability standards are adopted, such objects may be shared and reused through the Web, but the adoption of these standards usually requires sp
Publicado em: 2009
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15. Mazagão Velho: imagem-mundo de uma festa, um baile e suas máscaras / Mazagão Old: world-image of a party, a ball and its masks
This study has its focus on the masks of the feast of St. James of Mazagão Velho in the state of Amapá - Brazil. Held since 1777 by the residents of the city in the margins of the Mutuacá River, the feast celebrates the transfer of the former Portuguese colony from the Dukkala region, in the North of Africa. Full of rich and diversified visualities, ritua
Publicado em: 2009
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16. Realce de contraste em imagens digitais usando equalização de histograma
Nowadays devices are able to capture and process images from complex surveillance monitoring systems or from simple mobile phones. In certain applications, the time necessary to process the image is not as important as the quality of the processed images (e.g., medical imaging), but in other cases the quality can be sacrificed in favour of time.This thesis f
Publicado em: 2008
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17. Detect of scratches in spherical lenses, for light reflected under Fourier descriptors / Detecção de riscos em lentes esféricas, por luz refletida, através de descritores de Fourier
This work presents a methodology for inspection of spherical organic ophthalmic lenses during the polishing process. The methodology encompasses the capture of an ultraviolet image of the lens under inspection by a CCD video camera and associated processing of the image to discriminate between scratches on the lens and artifacts that can appear on the image.
Publicado em: 2007
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18. A palavra e a imagem no poema "o navio negreiro" de Castro Alves. / The word and image in poem the slave ship the Castro Alves.
Our thesis sails through the Castro Alves poem The slave ship, that incorporates itself in a romantic tradition by means of the dialog established with Heinrich Heine, Gonçalves Dias, Pedro Luiz and a minor poets pleiad, manifesting the poetry epos vicissitudes dedicated to the cause of the slaves freedom. The dialectic nature from this poetic reveals itsel
Publicado em: 2007
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19. Optimization of biplanar gradient coils for magnetic resonance imaging
"Open" magnetic resonance imaging (MRI) scanners are frequently based on electromagnets or permanent magnets, and require self-shielded planar gradient coils to prevent image artifacts resulting from eddy currents in metallic parts of the scanner. This work presents an optimization method for the development of self-shielded gradient coils with biplanar geom
Brazilian Journal of Physics. Publicado em: 2006-03
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20. Randomização progressiva para esteganalise / Progressive randomization for steganalysis
In this work, we describe a new methodology to detect the presence of hidden digital content in the Least Significant Bits (LSBs) of images. We introduce the Progressive Randomization technique that captures statistical artifacts inserted during the hiding process. Our technique is a progressive application of LSB modifying transformations that receives an i
Publicado em: 2006
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21. Structures and artifacts: the hero cult in Greek sites of Iron Age (XIth to VIIIth centuries BC) / Estruturas e artefatos $$b o culto heróico em sítios gregos da Idade do Ferro (séc. XI ao VIII a.C.)
This research aims to analyze the aspects of ritual practices that took place in monumental apsidal structures* in Greek sites of Iron Age (1100 to 700BC). Many authors believe that these funerary practices are dressed up as a real hero cult. Though, they also observe that generally is really difficult to establish a clear distinction between the sacred and
Publicado em: 2005
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22. Images by Nuclear Magnetic Resonance: A Modified Version of the EPI Method
It is well known that data accquisition times and image reconstruction procedures in conventional magnetic resonance imaging (MRI) are usually long. For time dependent phenomena, such as sample motion, respiration, blood flow pulsation and others, faster accquision times are desirable to avoid ghosting artifacts. Over the last two decades, a great number of
Brazilian Journal of Physics. Publicado em: 2001-06
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23. Efeito do movimento em MRI e implementação das técnicas de Gradient Moment Nulling e pré-saturação especial na redução de artefatos relacionados ao movimento. / Motion effects in magnetic resonance imaging and implementation of Gradient Moment Nulling and spatial presaturation for reducing motion related artifacts.
The purpose of this work was to analyze the effects of motion in conventional Magnetic Resonance Imaging (MRI), and to implement and optimize the Gradient Moment Nulling and Spatial Presaturation techniques, which can be used to minimize the motion related artifacts. Numerical simulations, were used to analyze the influence of the motion on the image and to
Publicado em: 1998
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24. Electron microscopy of frozen-hydrated bacteria.
Amorphous, unstained, frozen-hydrated sections of bacteria provide a faithful high-resolution image of procaryotic cells. Conventional preparation artifacts due to fixation, staining, and dehydration are nonexistent. Freezing damage is avoided by using glucose as a cryoprotectant. Cutting damage on frozen material is severe, but sectioning artifacts, being a