Search results for "Imatges"
showing 10 items of 68 documents
Area-Based Depth Estimation for Monochromatic Feature-Sparse Orthographic Capture
2018
With the rapid development of light field technology, depth estimation has been highlighted as one of the critical problems in the field, and a number of approaches have been proposed to extract the depth of the scene. However, depth estimation by stereo matching becomes difficult and unreliable when the captured images lack both color and feature information. In this paper, we propose a scheme that extracts robust depth from monochromatic, feature-sparse scenes recorded in orthographic sub-aperture images. Unlike approaches which rely on the rich color and texture information across the sub-aperture views, our approach is based on depth from focus techniques. First, we superimpose shifted …
Complex networks : application for texture characterization and classification
2008
This article describes a new method and approch of texture characterization. Using complex network representation of an image, classical and derived (hierarchical) measurements, we presente how to have good performance in texture classification. Image is represented by a complex networks : one pixel as a node. Node degree and clustering coefficient, using with traditionnal and extended hierarchical measurements, are used to characterize ”organisation” of textures.
El ángel y el carnero en el Sacrificio de Isaac. Continuidad y variación en la cultura visual.
2020
La figura del carnero destaca de forma significativa dentro del simbolismo animalístico en el cristianismo. El presente artículo se centra en el estudio diacrónico de las representaciones de dicho animal insertas dentro del tipo iconográfico del Sacrificio de Isaac, cuya fuente literaria es el Génesis 22. El análisis pormenorizado de este elemento significante dentro del pasaje veterotestamentario se torna fundamental a la hora de acudir a los primeros textos realizados por los Padres de la Iglesia, generando en si la aparición del ángel portando el carnero, una variante tipológica dentro del devenir del tipo iconográfico en su continuidad y variación. El objetivo, por tanto, es atender a a…
The relationship between genetic risk variants with brain structure and function in bipolar disorder: A systematic review of genetic-neuroimaging stu…
2017
Genetic-neuroimaging paradigms could provide insights regarding the pathophysiology of bipolar disorder (BD). Nevertheless, findings have been inconsistent across studies. A systematic review of gene-imaging studies involving individuals with BD was conducted across electronic major databases from inception until January 9th, 2017. Forty-four studies met eligibility criteria (N = 2122 BD participants). Twenty-six gene variants were investigated across candidate gene studies and 4 studies used a genome-wide association approach. Replicated evidence (i.e. in >2 studies) suggests that individuals with BD carrying the BDNF Val66Met risk allele could have reduced hippocampal volumes compared …
¿Un cambio climático? Una aproximación al paisaje artístico antes y después de la revuelta de las Germanías
2020
Este trabajo ofrece una sucinta revisión y un balance provisional de cómo ha tratado la historiografía el movimiento de las Germanías de Valencia (1519-1522) como condicionante de la actividad artística en la primera mitad del siglo XVi, época de notorios cambios en el lenguaje y la práctica de los oficios y en las obras promovidas por sujetos e instituciones del reino de Valencia. Sin pretensión de exhaustividad, la exposición deja en segundo plano las cuestiones de estilo para enmarcar algunas manifestaciones arquitectónicas y artísticas en las que incidió la revuelta y la alteración de la convivencia social entre la segunda y la tercera década del siglo XVI. HAR 2017-88707-P
From medical data to simple virtual mock-up of scapulo-humeral joint
2008
The surgical operations of shoulder joint are guided by various principles: osteosynthesis in the case of fracture, osteotomy in order to correct a deformation or to modify the functioning of the joint, or implementation of articular prosthesis. At the end of the twentieth century, many innovations in the domains of biomechanics and orthopedic surgery have been performed. Nevertheless, theoretical and practical problems may appear during the operation (visual field of surgeon is very limited, quality and shape of the bone is variable depending on the patient). Biomechanical criteria of success are defined for each intervention. For example, the installation with success of prosthetic implan…
Diseño y validación de un instrumento para analizar 'las otras imágenes' en los libros de texto de Educación Física
2016
Esta investigación tiene como objeto elaborar un instrumento que permita el análisis de las imágenes, de los libros de texto de Educación Física (en adelante EF), en las cuales no aparece la figura humana o aparece sin realizar actividad física. El instrumento se dividió en cuatro dimensiones: a) características técnicas de la imagen, b) otras imágenes relacionadas con el personaje, c) otras imágenes relacionadas con la actividad física y d) otras imágenes. Posteriormente se procedió a redactar las categorías y subcategorías de cada dimensión. Una vez elaborado el instrumento se realizó una validación de contenido a través de las siguientes fases: una primera fase de elaboración del instrum…
Mapping productivity and essential biophysical parameters of cultivated tropical grasslands from sentinel-2 imagery.
2020
Nitrogen (N) is the main nutrient element that maintains productivity in forages
Large Depth-of-Field Integral Microscopy by Use of a Liquid Lens
2018
Integral microscopy is a 3D imaging technique that permits the recording of spatial and angular information of microscopic samples. From this information it is possible to calculate a collection of orthographic views with full parallax and to refocus computationally, at will, through the 3D specimen. An important drawback of integral microscopy, especially when dealing with thick samples, is the limited depth of field (DOF) of the perspective views. This imposes a significant limitation on the depth range of computationally refocused images. To overcome this problem, we propose here a new method that is based on the insertion, at the pupil plane of the microscope objective, of an electrical…
Ownership protection of plenoptic images by robust and reversible watermarking
2018
Abstract Plenoptic images are highly demanded for 3D representation of broad scenes. Contrary to the images captured by conventional cameras, plenoptic images carry a considerable amount of angular information, which is very appealing for 3D reconstruction and display of the scene. Plenoptic images are gaining increasing importance in areas like medical imaging, manufacturing control, metrology, or even entertainment business. Thus, the adaptation and refinement of watermarking techniques to plenoptic images is a matter of raising interest. In this paper a new method for plenoptic image watermarking is proposed. A secret key is used to specify the location of logo insertion. Employing discr…