14 research outputs found
Opinions and experiences of paramedics when using mechanical devices for external cardiac massage
Neural Lens Modeling
Recent methods for 3D reconstruction and rendering increasingly benefit from
end-to-end optimization of the entire image formation process. However, this
approach is currently limited: effects of the optical hardware stack and in
particular lenses are hard to model in a unified way. This limits the quality
that can be achieved for camera calibration and the fidelity of the results of
3D reconstruction. In this paper, we propose NeuroLens, a neural lens model for
distortion and vignetting that can be used for point projection and ray casting
and can be optimized through both operations. This means that it can
(optionally) be used to perform pre-capture calibration using classical
calibration targets, and can later be used to perform calibration or refinement
during 3D reconstruction, e.g., while optimizing a radiance field. To evaluate
the performance of our proposed model, we create a comprehensive dataset
assembled from the Lensfun database with a multitude of lenses. Using this and
other real-world datasets, we show that the quality of our proposed lens model
outperforms standard packages as well as recent approaches while being much
easier to use and extend. The model generalizes across many lens types and is
trivial to integrate into existing 3D reconstruction and rendering systems.Comment: To be presented at CVPR 2023, Project webpage:
https://neural-lens.github.i
Neural Assets: Volumetric Object Capture and Rendering for Interactive Environments
Creating realistic virtual assets is a time-consuming process: it usually
involves an artist designing the object, then spending a lot of effort on
tweaking its appearance. Intricate details and certain effects, such as
subsurface scattering, elude representation using real-time BRDFs, making it
impossible to fully capture the appearance of certain objects. Inspired by the
recent progress of neural rendering, we propose an approach for capturing
real-world objects in everyday environments faithfully and fast. We use a novel
neural representation to reconstruct volumetric effects, such as translucent
object parts, and preserve photorealistic object appearance. To support
real-time rendering without compromising rendering quality, our model uses a
grid of features and a small MLP decoder that is transpiled into efficient
shader code with interactive framerates. This leads to a seamless integration
of the proposed neural assets with existing mesh environments and objects.
Thanks to the use of standard shader code rendering is portable across many
existing hardware and software systems
Energy changes in the chemical reactions of elements with hydrochloric acid and with hydrogen peroxide
Namen naloge je bila opredelitev reakcije posameznega elementa v elementarnem stanju s koncentrirano klorovodikovo kislino kot endotermno ali eksotermno in opredelitev reakcije posameznega elementa v elementarnem stanju z vodikovim peroksidom kot endotermno ali eksotermno. Kemijske reakcije sem izvajal v digestoriju, kjer sem s pomočjo Vernierjevega vmesnika spremljal spreminjanje temperature v določenem časovnem intervalu. Reakcije sem izvajal z vsemi elementi, ki so bili na voljo v laboratoriju, zajel pa sem tako skupino kovin in nekovin kot skupino polkovin. Reakcije so potekale pri približno enakih pogojih. V nalogi sem predstavil lastnosti posameznih elementov iz skupine kovin, polkovin in nekovin ter s primeri preproste razlage spreminjanja energije pri kemijskih reakcijah skušal predlagati učiteljem, kako se lotiti usvajanja te snovi v razredu. Z rezultati naloge sem želel izpostaviti najbolj tipične eksotermne in endotermne reakcije elementov s kislino ali peroksidom, ki sicer niso tako pogosti pri obravnavanju snovi v šolah, a vendar so v naravi prisotni in uporabni. S tem sem želel spodbuditi učitelje k obravnavi v šoli.The purpose od this dissertation was to define the reaction of a particular element in the elementary state with concentrated hydrochloric acid as endothermic or exothermicand to define the reaction of an element in the elementary state with hydrogen peroxide as endothermic or exothermic. I monitored the temperature change in time interval 10 minutes. The reactions took place under approximately the same conditions. With the results of the dissertation, I wanted to highlight the most typical exothermic and endothermic reactions of the elements with acid or peroxide, which are not so common in dealing with substances in schools, but they are naturally present and useful, and thus wanted to encourage teachers to be treated at school
Where should the label for a polygon be placed?
V magistrskem delu se najprej seznanimo s trilinearnimi in baricentričnimi koordinatami. Nato spoznamo izotomično in izogonalno transformacijo. Po uvodnih pojmih je podrobneje opisan problem, ki ga rešujemo postopoma. Začnemo z najenostavnejšimi liki, katerih geometrijo dokaj dobro poznamo. Pri iskanju točke, ki bi bila primerna za postavitev oznake večkotnika, naletimo na ogromno kandidatov, vendar se izkaže, da jih ima večina določene pomanjkljivosti.
Po opisanem postopku iskanja primerne točke in nekaj primerih se zopet vrnemo k trikotniku saj določimo algoritem, ki nas za poljubni večkotnik pripelje do točke, kjer moramo poiskati primerno točko ravno v trikotniku. Tu se srečamo s trikotniku včrtanimi elipsami in najbolj značilne tudi opišemo. Posebej obravnavamo tudi Lemoinovo elipso in Spiekerjevo točko, kar je tudi rešitev našega problema.In the following master thesis we first learn about trilinears, barycentrics. Then we describe isotomic and isogonal conjugate. After describing the main problem, we start searching for the most optimal place for placing laber for a polygon. We start with triangle and quadrilateral and we find out, that a lot of possible candidates (points) have some imperfections.
According to the procedure described for a suitable point and some examples, we return to the triangle again since we define an algorithm that leads us to conclusion that a point for placing a label for general polygon is a point in triangle which we get as result of algorithm. We consider ellipses inscribed in the triangle and some triangle centres related to these ellipses. At the end we show results related to Lemoine ellipse and Spieker centre, which are closely connected with the final step of the solution to our problem