Temat: cloud points - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: University of Warsaw Geology Department uses SMARTTECH 3D scanner to discover the secrets of earth
Autorzy:: Gębarski, K.
Lewandowski, M.
Kubik, K.
Powiązania:: https://bibliotekanauki.pl/articles/132104.pdf
Data publikacji:: 2016
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: 3D scanner
cloud of points
analysis
quartz crystals
Opis:: Researches provided on University of Warsaw Geology Department uses a 3D scanner to make advanced analysis of quartz crystals found on different places on Earth. Quartz crystals are formed in the same process for millions of years. They usually grow in regions of active volcanoes and earthquakes. Their final shape and color depend from number of external factors such as for example pressure, and temperature. Precise 3D scan of quartz crystals made with sub millimeter accuracy gives scientists unique possibilities of researching the condition under which the crystal was formed and discovering the earth condition from hundred thousand years ago.
Źródło:: Advanced Technologies in Mechanics; 2016, 3, no. 1 (6); 2-6
2392-0327
Pojawia się w:: Advanced Technologies in Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: An algorithm of a freeform surfaces measurement adjustment using a specification of the workpiece coordinate system location
Autorzy:: Buša, J.
Buša, J. Jr.
Dovica, M.
Fabian, M.
Ižol, P.
Honus, S.
Powiązania:: https://bibliotekanauki.pl/articles/103412.pdf
Data publikacji:: 2017
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: freeform surface
cloud of points
Nelder-Mead method
Newton method
Opis:: A difficulty of freeform surfaces evaluations lies in a setup of a coordinate measuring system in general, when it is not possible to use the standard system of alignment by a point, a line, and a surface. An algorithm for the measurement adjustment using a small workpiece coordinate system movement and rotation to achieve a smaller least square error of the produced surface for a given freeform surface defined by the function of two variables is considered. The algorithm uses the Newton method for calculation of the orthogonal distance of a measured point to a given surface and also for minimization of the sum of the distance squares. Numerical results for an example are given.
Źródło:: Advances in Science and Technology. Research Journal; 2017, 11, 3; 223-232
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Comparison of geometric precision of plastic components made by subtractive and additive methods
Autorzy:: Fudali, P.
Witkowski, W.
Wydrzyński, D.
Powiązania:: https://bibliotekanauki.pl/articles/101936.pdf
Data publikacji:: 2013
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: rapid prototyping
fused deposition modelling
machining
touch probe measurement
points cloud
Opis:: The paper presents information on manufacturing processes of plastic components. Basic subtractive and additive methods are described. There were also manufactured elements of fan housing by using this two types of methods. Then, the elements were measured using a touch probe. The obtained results were analyzed, on which a comparison of components’ geometric accuracy was performed.
Źródło:: Advances in Science and Technology. Research Journal; 2013, 7, 19; 36-40
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Accuracy assessment for cad modeling of freeform surface described by equation
Autorzy:: Golba, G.
Powiązania:: https://bibliotekanauki.pl/articles/387174.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: B-spline
CAD model
cloud of points
reverse engineering
NURBS
surface reconstruction
triangulation
model CAD
triangulacja
chmura punktów
inżynieria wsteczna
Opis:: This paper presents the results of comparative analysis of modeling accuracy the freeform surface constructed by using a variety of algorithms for surface modeling. Also determined the accuracy of mapping the theoretical freeform surface described by mathematical equation. To model surface objects used: SolidWorks 2012, CATIA v5 and Geomagic Studio 12. During the design process of CAD models were used: profile curves, fitting parametric surface and polygonal mesh. To assess the accuracy of the CAD models used Geomagic Qualify 12. On the basis of analyse defined the scope of application of each modeling techniques depending on the nature of the constructed object.
Źródło:: Acta Mechanica et Automatica; 2015, 9, 2; 110-114
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Curve skeleton extraction via k-nearest-neighbors based contraction
Autorzy:: Zhou, Jianling
Liu, Ji
Zhang, Min
Powiązania:: https://bibliotekanauki.pl/articles/331332.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: curve skeleton
points contraction
point cloud
k nearest neighbors
szkieletyzacja
chmura punktów
metoda k najbliższych sąsiadów
Opis:: We propose a skeletonization algorithm that is based on an iterative points contraction. We make an observation that the local center that is obtained via optimizing the sum of the distance to k nearest neighbors possesses good properties of robustness to noise and incomplete data. Based on such an observation, we devise a skeletonization algorithm that mainly consists of two stages: points contraction and skeleton nodes connection. Extensive experiments show that our method can work on raw scans of real-world objects and exhibits better robustness than the previous results in terms of extracting topology-preserving curve skeletons.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2020, 30, 1; 123-132
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

Artykuł

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