5,184 research outputs found
Motion Deblurring in the Wild
The task of image deblurring is a very ill-posed problem as both the image
and the blur are unknown. Moreover, when pictures are taken in the wild, this
task becomes even more challenging due to the blur varying spatially and the
occlusions between the object. Due to the complexity of the general image model
we propose a novel convolutional network architecture which directly generates
the sharp image.This network is built in three stages, and exploits the
benefits of pyramid schemes often used in blind deconvolution. One of the main
difficulties in training such a network is to design a suitable dataset. While
useful data can be obtained by synthetically blurring a collection of images,
more realistic data must be collected in the wild. To obtain such data we use a
high frame rate video camera and keep one frame as the sharp image and frame
average as the corresponding blurred image. We show that this realistic dataset
is key in achieving state-of-the-art performance and dealing with occlusions
Effect of flood basalt stratigraphy on seismic waveforms recorded offshore Faroe Islands
The generation of short-period multiples between highly heterogeneous layers of basalt flows can strongly alter transmitted seismic wavefields. These layers filter and modify penetrating waves, producing apparent attenuation and phase changes in the observed waveforms. We investigated the waveform and apparent phase changes of the primary seismic signal using mainly the maximum kurtosis approach. We compared the seismic recordings from two short-offset vertical seismic profiles (VSPs) with synthetic seismograms, generated from sonic logs in the same wells, and we found that short-period multiples cause a rapid broadening of the primary arrivals and strong apparent phase changes within a short depth interval below the top of the basalt flows. Relatively large uncertainties were associated with estimating constant phase shifts of the seismic arrivals within the topmost 250 m of the basalt sequences, where complex scattering occurred. Within this interval of the Brugdan I well, a phase-only compensation of the first arrivals with a frequency-independent, combined scattering, and intrinsic attenuation operator was unfeasible. At a greater depth, we found that the phase shifts, predicted by a VSP-derived effective Q value, were similar to those estimated from the VSP signals using the kurtosis method. Thus, phase-only compensation with a combined scattering and intrinsic attenuation operator could work well depending on the seismic signal bandwidth and the distribution, depth, and magnitude of the impedance contrasts in the basalt sequence
Pagamento por serviços ambientais hÃdricos no Brasil: experiências iniciais e os desafios do monitoramento.
Ao avaliar os projetos de pagamentos por serviços ambientais (PSA) no Brasil, observam-se dificuldades recorrentes relacionadas à falta de consolidação das metodologias para a seleção de áreas prioritárias e, sobretudo, para o monitoramento das áreas de prestação dos serviços. A estratégia de pagamentos por serviços ambientais é cada vez mais presente nas polÃticas ambientais, devido ao reconhecimento da necessidade de novos mecanismos de estÃmulo à conservação e à manutenção de serviços essenciais à vida, como a provisão de água. A partir da análise das experiências vivenciadas em projetos de Pagamento por Serviços Ambientais (PSA) relacionados à água de alguns estados brasileiros, o trabalho apresenta um panorama destas experiências, de maneira a identificar as tendências, os obstáculos enfrentados e, sobretudo, os aspectos relevantes das metodologias de monitoramento aplicadas
Pagamento por serviços ambientais hÃdricos no Brasil: experiências iniciais e os desafios do monitoramento.
Ao avaliar os projetos de pagamentos por serviços ambientais (PSA) no Brasil, observase dificuldades recorrentes relacionadas à falta de consolidação das metodologias para a seleção de áreas prioritárias e, sobretudo, para o monitoramento das áreas de prestação de serviços. A estratégia de pagamentos por serviços ambientais é cada vez mais presente nas polÃticas ambientais, a partir de um reconhecimento da necessidade de novos mecanismos de estÃmulo à conservação e à manutenção de serviços essenciais à vida, como a provisão de água. A partir da análise das experiências vivenciadas em projetos de Pagamento por Serviços Ambientais (PSA) relacionado à água de alguns estados brasileiros, pretende-se proporcionar um panorama destas experiências, de maneira a identificar as tendências, os gargalos e, sobretudo, questões relacionadas à s metodologias de monitoramento aplicadas
Resonant Production of Scalar Diquarks at the Next Generation Electron-Positron Colliders
We investigate the potential of TESLA and JLC/NLC electron-positron linear
collider designs to observe diquarks produced resonantly in processes involving
hard photons.Comment: 14 pages, 8 figures, coded in RevTEX, uses epsfi
Tritrophic interactions between a Bt plant, the diamondback moth and a braconid endoparasitoid
The ATLAS Level-1 Muon to Central Trigger Processor Interface
The Muon to Central Trigger Processor Interface (MUCTPI) is part of the ATLAS Level-1 trigger system and connects the output of muon trigger system to the Central Trigger Processor (CTP). At every bunch crossing (BC), the MUCTPI receives information on muon candidates from each of the 208 muon trigger sectors and calculates the total multiplicity for each of six transverse momentum (pT) thresholds. This multiplicity value is then sent to the CTP, where it is used together with the input from the Calorimeter trigger to make the final Level-1 Accept (L1A) decision. In addition the MUCTPI provides summary information to the Level-2 trigger and to the data acquisition (DAQ) system for events selected at Level-1. This information is used to define the regions of interest (RoIs) that drive the Level-2 muontrigger processing. The MUCTPI system consists of a 9U VME chassis with a dedicated active backplane and 18 custom designed modules. The design of the modules is based on state-of-the-art FPGA devices and special attention was paid to low-latency in the data transmission and processing. We present the design and implementation of the final version of the MUCTPI. A partially populated MUCTPI system is already installed in the ATLAS experiment and is being used regularly for commissioning tests and combined cosmic ray data taking runs
- …