Search results for " Photography"
showing 10 items of 107 documents
Unmanned aerial system imagery and photogrammetric canopy height data in area-based estimation of forest variables
2015
In this paper we examine the feasibility of data from unmanned aerial vehicle (UAV)-borne aerial imagery in stand-level forest inventory. As airborne sensor platforms, UAVs offer advantages cost and flexibility over traditional manned aircraft in forest remote sensing applications in small areas, but they lack range and endurance in larger areas. On the other hand, advances in the processing of digital stereo photography make it possible to produce three-dimensional (3D) forest canopy data on the basis of images acquired using simple lightweight digital camera sensors. In this study, an aerial image orthomosaic and 3D photogrammetric canopy height data were derived from the images acquired …
Multitemporal Monitoring of Plant Area Index in the Valencia Rice District with PocketLAI
2016
Leaf area index (LAI) is a key biophysical parameter used to determine foliage cover and crop growth in environmental studies in order to assess crop yield. Frequently, plant canopy analyzers (LAI-2000) and digital cameras for hemispherical photography (DHP) are used for indirect effective plant area index (PAI(eff)) estimates. Nevertheless, these instruments are expensive and have the disadvantages of low portability and maintenance. Recently, a smartphone app called PocketLAI was presented and tested for acquiring PAI(eff) measurements. It was used during an entire rice season for indirect PAI(eff) estimations and for deriving reference high-resolution PAI(eff) maps. Ground PAI(eff) value…
Gibellina molteplice di Maurizio Galimberti
2021
Il saggio presenta la serie di fotografie che Maurizio Galimberti, artista di fama internazionale, dedica al tema della molteplicità attraverso la propria visione inedita della città di Gibellina, con particolare attenzione alle sue architetture e opere d'arte contemporanea. The essay presents the series of photographs that Maurizio Galimberti, an internationally renowned artist, dedicates to the theme of multiplicity through his own unprecedented vision of the city of Gibellina, with particular attention to its architecture and contemporary works of art.
Framing Migrant Memories: Lampedusa's Fragmented Archives
2022
The small island of Lampedusa, a key destination of the Central Mediterranean Route connecting Africa to Italy, offers a special observatory on the contemporary trans-Mediterranean odyssey of migrants, although often transformed into a “border spectacle.” Upon landing, migrants are stripped of their belongings, as these are impounded by the authorities. Such an act of dispossession is intended to deprive them of their histories, family ties and cultural identity. Photographer Mario Badagliacca has portrayed a selection of these lost and retrieved items in his work Fragments (2013). Each object reveals expectations, fears, desires, endurance, but cannot tell a full story. They are fragments …
Soggetto in quanto corpo
2016
According to Anders, technology replaces human body, in fact it is more powerful than physicality which can’t be shaped. Technology imposes itself on human body while human beings are ashamed of their one. Reduction of the body destroys humanity of human being and its scale of values. According to Heidegger, the vocation of technology is to impose itself and to be independent from man, but it supports life and nature. Even neurobiology offers a duality between higher cognitive activities of mind and the part of the brain connected to emotions. Both technology and higher activity of mind seem to propose a transcendence of the body. But the aesthetic fruition of photography reconfigures human…
Color and photography in the restorative dentistry. A brief communication about color temperature, dental color and the use of light and photography …
2020
Relevance. Optical properties of dental tissues can be captured by photography, considering the characteristics of the light sources. Therefore photography might become a way to communicate the color and the characterizing aspects of the teeth, reducing the misunderstandings between the dental practice and the laboratory in the project of dental restoration. Purpose. To illustrate some ways of using the current photographic technology to document teeth color correctly, and to be able to communicate it without misunderstandings and to replicate it in a simple way. Materials and methods. The photographs were taken using Nikon D500 digital camera, Nikkor 60 mm 2.8 macro lens, Nikon SB-700 Spee…
Isotropic compensation of diffraction-driven angular dispersion
2007
We report on an optical arrangement capable of compensating angular dispersion of paraxial wave fields developed by diffractive optical elements (DOEs). Schematically, the system is a beam expander in which two phase-only zone plates have been inserted, remaining afocal the coupled system. The DOE, which induces a continuous set of dispersive tilted plane waves, is placed at a specific position within the proposed setup providing an output spectrum with achromatic angular deviation. A directional matching between phase fronts and pulse fronts of output wave packets is demonstrated.
Digital diagnosis records in orthodontics. An overview.
2006
Actualmente la tecnología digital es una realidad que cada vez se impone más en todos los ámbitos clínicos y, por tanto, existe una incorporación también de los ortodoncistas a la digitalización de los registros ortodóncicos diagnósticos. En este trabajo queremos hacer una valoración sobre las ventajas y desventajas, del uso de la radiografía digital, la fotografía digital así como de la última incorporación, los modelos de estudio digitalizados. Basados en encuestas previas, mostraremos la situación actual en nuestro país en cuanto al número de profesionales que utilizan estos registros digitales de manera sistemática. Digital technology is becoming day by day a more important procedure in…
Accuracy assessment of fraction of vegetation cover and leaf area index estimates from pragmatic methods in a cropland area
2009
The fraction of vegetation cover (FVC) and the leaf area index (LAI) are important parameters for many agronomic, ecological and meteorological applications. Several in-situ and remote sensing techniques for estimating FVC and LAI have been developed in recent years. In this paper, the uncertainty of in-situ FVC and LAI measurements was evaluated by comparing estimates from LAI-2000 and digital hemispherical photography (DHP). The accuracy achieved with a spectral mixture analysis algorithm and two vegetation indices-based methods was assessed using atmospherically corrected Landsat Thematic Mapper (TM) data over the Barrax cropland area where the European Space Agency (ESA) SENtinel-2 and …
Seguimiento digitalizado combinado en población con alto riesgo de desarrollar un melanoma maligno: análisis retrospectivo de 152 pacientes
2021
Resumen: Antecedentes: La dermatoscopia digitalizada (DD) ha demostrado mejorar la precisión en el diagnóstico del melanoma (MM) en pacientes de alto riesgo. La combinación de DD y fotografía corporal total (FCT) puede facilitar la detección de nuevas lesiones o la aparición de cambios macroscópicos precoces en lesiones previamente registradas. Objetivos: El objetivo del presente estudio fue determinar el número de biopsias necesarias para diagnosticar un MM y, las características clínicas y dermatoscópicas asociadas al diagnóstico de melanoma en pacientes en seguimiento, mediante DD y FCT, de lesiones pigmentadas. Pacientes y métodos: Se realizó un estudio retrospectivo de 152 pacientes co…