Search results for "imatge"

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…

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 …

GPU-accelerated integral imaging and full-parallax 3D display using stereo-plenoptic camera system

2019

Abstract In this paper, we propose a novel approach to produce integral images ready to be displayed onto an integral-imaging monitor. Our main contribution is the use of commercial plenoptic camera, which is arranged in a stereo configuration. Our proposed set-up is able to record the radiance, spatial and angular, information simultaneously in each different stereo position. We illustrate our contribution by composing the point cloud from a pair of captured plenoptic images, and generate an integral image from the properly registered 3D information. We have exploited the graphics processing unit (GPU) acceleration in order to enhance the integral-image computation speed and efficiency. We…

New Method of Microimages Generation for 3D Display

2018

In this paper, we propose a new method for the generation of microimages, which processes real 3D scenes captured with any method that permits the extraction of its depth information. The depth map of the scene, together with its color information, is used to create a point cloud. A set of elemental images of this point cloud is captured synthetically and from it the microimages are computed. The main feature of this method is that the reference plane of displayed images can be set at will, while the empty pixels are avoided. Another advantage of the method is that the center point of displayed images and also their scale and field of view can be set. To show the final results, a 3D InI dis…

Consenso SECOT artrosis femorotibial medial

2013

Se presenta un consenso elaborado por SECOT sobre la actuación en la artrosis del compartimento medial de la rodilla para establecer criterios y recomendaciones clínicas orientadas a unificar criterios en su manejo, abordando los factores implicados en la patogenia de la artrosis femorotibial medial de rodilla, la utilidad de las técnicas diagnósticas por la imagen y la utilidad de la artroscopia. También se analizarán los tratamientos conservadores y el tratamiento quirúrgico. Los expertos consultados muestran consenso (acuerdo o desacuerdo)en el 65,85% de los ítems planteados, dejando 14 ítems donde no se encontró el consenso que se enmarcaron en la etiopatogenia de la artrosis, el valor …

Fast and robust phase-shift estimation in two-dimensional structured illumination microscopy.

2019

A method of determining unknown phase-shifts between elementary images in two-dimensional Structured Illumination Microscopy (2D-SIM) is presented. The proposed method is based on the comparison of the peak intensity of spectral components. These components correspond to the inherent structured illumination spectral content and the residual compo- nent that appears from wrongly estimated phase-shifts. The estimation of the phase-shifts is carried out by finding the absolute maximum of a function defined as the normalized peak intensity difference in the Fourier domain. This task is performed by an optimization method providing a fast estimation of the phase-shift. The algorithm stability an…

Oracion panegirica, en las solemnes fiestas que consagra todos los años la mayor Nobleza de esta Corte, a la milagrosa imagen de Nuestro Padre Santo…

1678

Sig. [calderó]4, 2[calderó]2, A-D4 Text amb postil·les marginals. - Reclams. - Capital grav.

Oracion panegirica, en las solemnes fiestas que consagra todos los años la mayor Nobleza de esta Corte, a la milagrosa imagen de Nuestro Padre Santo …

Sig. [calderó]4, 2[calderó]2, A-D4 Text amb postil·les marginals. - Reclams. - Capital grav

El uso de la vídeo-cámara en el periodismo de investigación

2013

El uso de la cámara oculta en el periodismo de investigación es una constante en nuestros días. Hasta la fecha, el Tribunal Supremo ha considerado el método legítimo, si bien invasivo en determinadas ocasiones, por atentar contra los derechos a la intimidad y a la propia imagen. El Tribunal Constitucional, en cambio, lo ha considerado inconstitucional, a pesar de que cabe preguntarse si queda prohibido en todo caso, o podría ser válido en la medida en que la imagen y el sonido de la persona captada se distorsionaran hasta el punto de hacerla irreconocible. De esta forma, a mi juicio, quedarían a salvo los derechos a la intimidad y a la propia imagen.

Il vero ed original ritratto di Christo Signor nostro in Croce : Narratione Historica dell'Origine del Santissimo Crocifisso, della Maggiore, e Metro…

1704

Sig. A-Q8 En la f. de làm. "Nius Filippone". - Algún ornament tip. i capital grav. xil. Errates de p. - Reclams