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Visual Images Segmentation based on Uniform Textures Extraction
Goltsev, A.; Gritsenko, V.; Húsek, Dušan
2020 - anglický
A new effective procedure for partial texture segmentation of visual images is proposed. The procedure segments any input image into a number of non-overlapping homogeneous ne-grained texture areas. The main advantages of the proposed procedure are as follows. It is completely unsupervised, that is, it processes the input image without any prior knowledge of either the type of textures or the number of texture segments in the image. In addition, the procedure segments arbitrary images of all types. This means that no changes to the procedure parameters are required to switch from one image type to another. Another major advantage of the procedure is that in most cases it extracts the uniform ne-grained texture segments present in the image, just as humans do. This result is supported by series of experiments that demonstrate the ability of the procedure to delineate uniform ne-grained texture segments over a wide range of images. At a minimum, image processing according to the proposed technique leads to a signficant reduction in the uncertainty of the internal structure of the analyzed image.
Klíčová slova:
Texture feature; Texture window; Homogeneous ne-grained texture segment; Texture segment extraction; Texture segmentation
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Visual Images Segmentation based on Uniform Textures Extraction
A new effective procedure for partial texture segmentation of visual images is proposed. The procedure segments any input image into a number of non-overlapping homogeneous ne-grained texture areas. ...
Measurements on TR-W-1 Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with linear part of suction side downstream the sonic line, which is intended for the rotor wheal of a last stage of steam turbine
Klíčová slova:
transonic flow; steam turbine; profile cascade
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on TR-W-1 Cascade
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with linear part of suction side downstream the sonic line, which is intended for the ...
Measurements on TR-W-2 Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with non-linear part of suction side downstream the sonic line, which is intended for the rotor wheal of a last stage of steam turbine.
Klíčová slova:
transonic flow; steam turbine; profile cascade
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on TR-W-2 Cascade
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with non-linear part of suction side downstream the sonic line, which is intended for ...
ECB monetary policy and commodity prices
Aliyev, S.; Kočenda, Evžen
2020 - anglický
We analyze the impact of the ECB monetary policies on global aggregate and sectoral commodity prices using monthly data from January 2001 till August 2019. We employ a SVAR model and assess separately period of conventional monetary policy before global financial crisis (GFC) and unconventional monetary policy during post-crisis period. Our key results indicate that contractionary monetary policy shocks have positive effects on the aggregate and sectoral commodity prices during both conventional and unconvetional monetary policy periods. The effect is statistically significant for aggregate commodity prices during post-crisis period. In terms of sectoral impact, the effect is statistically significant for food prices in both periods and for fuel prices during post-crisis period; other commodities display positive but statistically insignificant responses. Further, we demonstrate that the impact of the ECB monetary policy on commodity prices increased remarkably after the GFC. Our results also suggest that the effect of the ECB monetary policy on commodity prices does not transmit directly through market demand and supply expectations channel, but rather through the exchange rate channel that influences the European market demand directly.
Klíčová slova:
European Central Bank; commodity prices; monetary policy
Dokument je dostupný na externích webových stránkách.
ECB monetary policy and commodity prices
We analyze the impact of the ECB monetary policies on global aggregate and sectoral commodity prices using monthly data from January 2001 till August 2019. We employ a SVAR model and assess separately ...
Measurements on KR-D-3 Blade Cascade
Šimurda, David; Hála, Jindřich; Radnic, Tomáš
2020 - anglický
This report contains result and evaluation of aerodynamic measurements conducted on a subsonic compressor blade cascade.
Klíčová slova:
compressor blade cascade; experiment; subsonic flow; transonic flow; AVDR
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on KR-D-3 Blade Cascade
This report contains result and evaluation of aerodynamic measurements conducted on a subsonic compressor blade cascade.
Bayesian Selective Transfer Learning for Patient-Specific Inference in Thyroid Radiotherapy
Murray, Sean Ernest; Quinn, Anthony
2020 - anglický
This research report outlines a selective transfer approach for Bayesian estimation of patient-specific levels of radioiodine activity in the thyroid during the treatment of differentiated thyroid carcinoma. The work seeks to address some limitations of previous approaches [4] which involve generic, non-selective transfer of archival data. It is proposed that improvements in patient-specific inferences may be achieved via transferring external population knowledge selectively. This involves matching the patient to a similar sub-population based on available metadata, generating a Gaussian Mixture Model within the partitioned data, and optimally transferring a data predictive distribution from the sub-population to the specific patient. Additionally, a performance evaluation method is proposed and early-stage results presented.
Klíčová slova:
Bayesian estimation; thyroid carcinoma; patient-specific inferences
Dokument je dostupný na externích webových stránkách.
Bayesian Selective Transfer Learning for Patient-Specific Inference in Thyroid Radiotherapy
This research report outlines a selective transfer approach for Bayesian estimation of patient-specific levels of radioiodine activity in the thyroid during the treatment of differentiated thyroid ...
Bayesian transfer learning between autoregressive inference tasks
Barber, Alec; Quinn, Anthony
2020 - anglický
Bayesian transfer learning typically relies on a complete stochastic dependence speci cation between source and target learners which allows the opportunity for Bayesian conditioning. We advocate that any requirement for the design or assumption of a full model between target and sources is a restrictive form of transfer learning.
Klíčová slova:
autoregression; transfer learning; Fully Probabilistic Design; FPD; food-commodities price prediction
Dokument je dostupný na externích webových stránkách.
Bayesian transfer learning between autoregressive inference tasks
Bayesian transfer learning typically relies on a complete stochastic dependence speci cation between source and target learners which allows the opportunity for Bayesian conditioning. We advocate that ...
Region of interest tomography
Vopálenský, Michal; Kumpová, Ivana
2020 - anglický
During standard tomographic process, the acquisition of tomographic data (projections) is performed with geometric adjustment of the tomographic assembly ensuring that the projection of the entire width of the examined object fits onto the detector during the full object rotation. Because of the limited width of the detector, this approach has a limited maximum achievable resolution for the given specimen diameter. It is possible to make higher magnification, but then the projections do not fit onto the detector, which causes certain problems during the reconstruction, but allows achieving of higher resolution in the always-visible region of the object (the region of interest). The research was focused on evaluation of ROI tomography approach on the TORATOM tomograph.
Klíčová slova:
X-ray computed tomography; resolution; Region-of-Interest tomography
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Region of interest tomography
During standard tomographic process, the acquisition of tomographic data (projections) is performed with geometric adjustment of the tomographic assembly ensuring that the projection of the entire ...
Optical and Pneumatic Measurement on TR-U-10 Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The report contains results and evaluation of conducted optical (interferometry and schlierren technique) and pneumatic measurements on the third variant of the new tip section, intended for long rotor blade.
Klíčová slova:
transonic flow; tip section; steam turbine
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Optical and Pneumatic Measurement on TR-U-10 Cascade
The report contains results and evaluation of conducted optical (interferometry and schlierren technique) and pneumatic measurements on the third variant of the new tip section, intended for long ...
Optical and Pneumatic Measurements on TR-U-9A Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The report contains results and evaluation of conducted optical (interferometry and schlieren technique) and pneumatic measurements on the eroded variant of the new tip section, intended for long rotor blade.
Klíčová slova:
transonic flow; experimental aerodynamic; steam turbine
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Optical and Pneumatic Measurements on TR-U-9A Cascade
The report contains results and evaluation of conducted optical (interferometry and schlieren technique) and pneumatic measurements on the eroded variant of the new tip section, intended for long ...
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