In mathematics, a Voronoi diagram is a partition of a plane into regions close to each of a given set of objects. It can be classified also as a tessellation. In the simplest case, these objects are just finitely many points in the plane (called seeds, sites, or generators). For each seed there is a corresponding region, called a Voronoi cell, consisting of all points of the plane closer to that seed than to any other. The Voronoi diagram of a set of points is dual to that set's Delaunay triangulation.
The Voronoi diagram is named after mathematician Georgy Voronoy, and is also called a Voronoi tessellation, a Voronoi decomposition, a Voronoi partition, or a Dirichlet tessellation (after Peter Gustav Lejeune Dirichlet). Voronoi cells are also known as Thiessen polygons, after Alfred H. Thiessen.^{[1]}^{[2]}^{[3]} Voronoi diagrams have practical and theoretical applications in many fields, mainly in science and technology, but also in visual art.^{[4]}^{[5]}
The simplest caseedit
In the simplest case, shown in the first picture, we are given a finite set of points $\{p_{1},\dots p_{n}\}$ in the Euclidean plane. In this case each site $p_{k}$ is one of these given points, and its corresponding Voronoi cell $R_{k}$ consists of every point in the Euclidean plane for which $p_{k}$ is the nearest site: the distance to $p_{k}$ is less than or equal to the minimum distance to any other site $p_{j}$. For one other site $p_{j}$, the points that are closer to $p_{k}$ than to $p_{j}$, or equally distant, form a closed half-space, whose boundary is the perpendicular bisector of line segment $p_{j}p_{k}$. Cell $R_{k}$ is the intersection of all of these $n-1$ half-spaces, and hence it is a convex polygon.^{[6]} When two cells in the Voronoi diagram share a boundary, it is a line segment, ray, or line, consisting of all the points in the plane that are equidistant to their two nearest sites. The vertices of the diagram, where three or more of these boundaries meet, are the points that have three or more equally distant nearest sites.
Formal definitionedit
Let ${\textstyle X}$ be a metric space with distance function ${\textstyle d}$. Let ${\textstyle K}$ be a set of indices and let ${\textstyle (P_{k})_{k\in K}}$ be a tuple (indexed collection) of nonempty subsets (the sites) in the space ${\textstyle X}$. The Voronoi cell, or Voronoi region, ${\textstyle R_{k}}$, associated with the site ${\textstyle P_{k}}$ is the set of all points in ${\textstyle X}$ whose distance to ${\textstyle P_{k}}$ is not greater than their distance to the other sites ${\textstyle P_{j}}$, where ${\textstyle j}$ is any index different from ${\textstyle k}$. In other words, if ${\textstyle d(x,\,A)=\inf\{d(x,\,a)\mid a\in A\}}$ denotes the distance between the point ${\textstyle x}$ and the subset ${\textstyle A}$, then
The Voronoi diagram is simply the tuple of cells ${\textstyle (R_{k})_{k\in K}}$. In principle, some of the sites can intersect and even coincide (an application is described below for sites representing shops), but usually they are assumed to be disjoint. In addition, infinitely many sites are allowed in the definition (this setting has applications in geometry of numbers and crystallography), but again, in many cases only finitely many sites are considered.
In the particular case where the space is a finite-dimensionalEuclidean space, each site is a point, there are finitely many points and all of them are different, then the Voronoi cells are convex polytopes and they can be represented in a combinatorial way using their vertices, sides, two-dimensional faces, etc. Sometimes the induced combinatorial structure is referred to as the Voronoi diagram. In general however, the Voronoi cells may not be convex or even connected.
In the usual Euclidean space, we can rewrite the formal definition in usual terms. Each Voronoi polygon ${\textstyle R_{k}}$ is associated with a generator point ${\textstyle P_{k}}$.
Let ${\textstyle X}$ be the set of all points in the Euclidean space. Let ${\textstyle P_{1}}$ be a point that generates its Voronoi region ${\textstyle R_{1}}$, ${\textstyle P_{2}}$ that generates ${\textstyle R_{2}}$, and ${\textstyle P_{3}}$ that generates ${\textstyle R_{3}}$, and so on. Then, as expressed by Tran et al,^{[7]} "all locations in the Voronoi polygon are closer to the generator point of that polygon than any other generator point in the Voronoi diagram in Euclidean plane".
Illustrationedit
As a simple illustration, consider a group of shops in a city. Suppose we want to estimate the number of customers of a given shop. With all else being equal (price, products, quality of service, etc.), it is reasonable to assume that customers choose their preferred shop simply by distance considerations: they will go to the shop located nearest to them. In this case the Voronoi cell $R_{k}$ of a given shop $P_{k}$ can be used for giving a rough estimate on the number of potential customers going to this shop (which is modeled by a point in our city).
For most cities, the distance between points can be measured using the familiar
Euclidean distance:
Assume the setting is the Euclidean plane and a discrete set of points is given. Then two points of the set are adjacent on the convex hull if and only if their Voronoi cells share an infinitely long side.
If the space is a normed space and the distance to each site is attained (e.g., when a site is a compact set or a closed ball), then each Voronoi cell can be represented as a union of line segments emanating from the sites.^{[8]} As shown there, this property does not necessarily hold when the distance is not attained.
Under relatively general conditions (the space is a possibly infinite-dimensional uniformly convex space, there can be infinitely many sites of a general form, etc.) Voronoi cells enjoy a certain stability property: a small change in the shapes of the sites, e.g., a change caused by some translation or distortion, yields a small change in the shape of the Voronoi cells. This is the geometric stability of Voronoi diagrams.^{[9]} As shown there, this property does not hold in general, even if the space is two-dimensional (but non-uniformly convex, and, in particular, non-Euclidean) and the sites are points.
History and researchedit
Informal use of Voronoi diagrams can be traced back to Descartes in 1644.^{[10]}Peter Gustav Lejeune Dirichlet used two-dimensional and three-dimensional Voronoi diagrams in his study of quadratic forms in 1850.
British physician John Snow used a Voronoi-like diagram in 1854 to illustrate how the majority of people who died in the Broad Street cholera outbreak lived closer to the infected Broad Street pump than to any other water pump.
Voronoi diagrams are named after Georgy Feodosievych Voronoy who defined and studied the general n-dimensional case in 1908.^{[11]} Voronoi diagrams that are used in geophysics and meteorology to analyse spatially distributed data are called Thiessen polygons after American meteorologist Alfred H. Thiessen, who used them to estimate rainfall from scattered measurements in 1911. Other equivalent names for this concept (or particular important cases of it): Voronoi polyhedra, Voronoi polygons, domain(s) of influence, Voronoi decomposition, Voronoi tessellation(s), Dirichlet tessellation(s).
Examplesedit
Voronoi tessellations of regular lattices of points in two or three dimensions give rise to many familiar tessellations.
A 2D lattice gives an irregular honeycomb tessellation, with equal hexagons with point symmetry; in the case of a regular triangular lattice it is regular; in the case of a rectangular lattice the hexagons reduce to rectangles in rows and columns; a square lattice gives the regular tessellation of squares; note that the rectangles and the squares can also be generated by other lattices (for example the lattice defined by the vectors (1,0) and (1/2,1/2) gives squares).
For the set of points (x, y) with x in a discrete set X and y in a discrete set Y, we get rectangular tiles with the points not necessarily at their centers.
Higher-order Voronoi diagramsedit
Although a normal Voronoi cell is defined as the set of points closest to a single point in S, an nth-order Voronoi cell is defined as the set of points having a particular set of n points in S as its n nearest neighbors. Higher-order Voronoi diagrams also subdivide space.
Higher-order Voronoi diagrams can be generated recursively. To generate the n^{th}-order Voronoi diagram from set S, start with the (n − 1)^{th}-order diagram and replace each cell generated by X = {x_{1}, x_{2}, ..., x_{n−1}} with a Voronoi diagram generated on the set S − X.
Farthest-point Voronoi diagramedit
For a set of n points the (n − 1)^{th}-order Voronoi diagram is called a farthest-point Voronoi diagram.
For a given set of points S = {p_{1}, p_{2}, ..., p_{n}} the farthest-point Voronoi diagram divides the plane into cells in which the same point of P is the farthest point. A point of P has a cell in the farthest-point Voronoi diagram if and only if it is a vertex of the convex hull of P. Let H = {h_{1}, h_{2}, ..., h_{k}} be the convex hull of P; then the farthest-point Voronoi diagram is a subdivision of the plane into k cells, one for each point in H, with the property that a point q lies in the cell corresponding to a site h_{i} if and only if d(q, h_{i}) > d(q, p_{j}) for each p_{j} ∈ S with h_{i} ≠ p_{j}, where d(p, q) is the Euclidean distance between two points p and q.^{[12]}^{[13]}
The boundaries of the cells in the farthest-point Voronoi diagram have the structure of a topological tree, with infinite rays as its leaves. Every finite tree is isomorphic to the tree formed in this way from a farthest-point Voronoi diagram.^{[14]}
Generalizations and variationsedit
As implied by the definition, Voronoi cells can be defined for metrics other than Euclidean, such as the Mahalanobis distance or Manhattan distance. However, in these cases the boundaries of the Voronoi cells may be more complicated than in the Euclidean case, since the equidistant locus for two points may fail to be subspace of codimension 1, even in the two-dimensional case.
A weighted Voronoi diagram is the one in which the function of a pair of points to define a Voronoi cell is a distance function modified by multiplicative or additive weights assigned to generator points. In contrast to the case of Voronoi cells defined using a distance which is a metric, in this case some of the Voronoi cells may be empty. A power diagram is a type of Voronoi diagram defined from a set of circles using the power distance; it can also be thought of as a weighted Voronoi diagram in which a weight defined from the radius of each circle is added to the squared Euclidean distance from the circle's center.^{[15]}
The Voronoi diagram of $n$ points in $d$-dimensional space can have ${\textstyle O(n^{\lceil d/2\rceil })}$ vertices, requiring the same bound for the amount of memory needed to store an explicit description of it. Therefore, Voronoi diagrams are often not feasible for moderate or high dimensions. A more space-efficient alternative is to use approximate Voronoi diagrams.^{[16]}
It is used in meteorology and engineering hydrology to find the weights for precipitation data of stations over an area (watershed). The points generating the polygons are the various station that record precipitation data. Perpendicular bisectors are drawn to the line joining any two stations. This results in the formation of polygons around the stations. The area $(A_{i})$ touching station point is known as influence area of the station. The average precipitation is calculated by the formula ${\bar {P}}={\frac {\sum A_{i}P_{i}}{\sum A_{i}}}$
Humanities and social sciencesedit
In classical archaeology, specifically art history, the symmetry of statue heads is analyzed to determine the type of statue a severed head may have belonged to. An example of this that made use of Voronoi cells was the identification of the Sabouroff head, which made use of a high-resolution polygon mesh.^{[17]}^{[18]}
In dialectometry, Voronoi cells are used to indicate a supposed linguistic continuity between survey points.
In political science, Voronoi diagrams have been used to study multi-dimensional, multi-party competition.^{[19]}
Natural sciencesedit
In biology, Voronoi diagrams are used to model a number of different biological structures, including cells^{[20]} and bone microarchitecture.^{[21]} Indeed, Voronoi tessellations work as a geometrical tool to understand the physical constraints that drive the organization of biological tissues.^{[22]}
In hydrology, Voronoi diagrams are used to calculate the rainfall of an area, based on a series of point measurements. In this usage, they are generally referred to as Thiessen polygons.
In ecology, Voronoi diagrams are used to study the growth patterns of forests and forest canopies, and may also be helpful in developing predictive models for forest fires.
In computational chemistry, ligand-binding sites are transformed into Voronoi diagrams for machine learning applications (e.g., to classify binding pockets in proteins).^{[23]} In other applications, Voronoi cells defined by the positions of the nuclei in a molecule are used to compute atomic charges. This is done using the Voronoi deformation density method.
In astrophysics, Voronoi diagrams are used to generate adaptative smoothing zones on images, adding signal fluxes on each one. The main objective of these procedures is to maintain a relatively constant signal-to-noise ratio on all the images.
In computational fluid dynamics, the Voronoi tessellation of a set of points can be used to define the computational domains used in finite volume methods, e.g. as in the moving-mesh cosmology code AREPO.^{[24]}
In medical diagnosis, models of muscle tissue, based on Voronoi diagrams, can be used to detect neuromuscular diseases.^{[22]}
In epidemiology, Voronoi diagrams can be used to correlate sources of infections in epidemics. One of the early applications of Voronoi diagrams was implemented by John Snow to study the 1854 Broad Street cholera outbreak in Soho, England. He showed the correlation between residential areas on the map of Central London whose residents had been using a specific water pump, and the areas with the most deaths due to the outbreak.^{[26]}
Engineeringedit
In polymer physics, Voronoi diagrams can be used to represent free volumes of polymers.
In materials science, polycrystalline microstructures in metallic alloys are commonly represented using Voronoi tessellations.
In island growth, the Voronoi diagram is used to estimate the growth rate of individual islands.^{[27]}^{[28]}^{[29]}^{[30]}^{[31]}
In aviation, Voronoi diagrams are superimposed on oceanic plotting charts to identify the nearest airfield for in-flight diversion (see ETOPS), as an aircraft progresses through its flight plan.
In urban planning, Voronoi diagrams can be used to evaluate the Freight Loading Zone system.^{[33]}
In mining, Voronoi polygons are used to estimate the reserves of valuable materials, minerals, or other resources. Exploratory drillholes are used as the set of points in the Voronoi polygons.
In robotics, some of the control strategies and path planning algorithms^{[35]} of multi-robot systems are based on the Voronoi partitioning of the environment.^{[36]}^{[37]}
Mathematicsedit
A point location data structure can be built on top of the Voronoi diagram in order to answer nearest neighbor queries, where one wants to find the object that is closest to a given query point. Nearest neighbor queries have numerous applications. For example, one might want to find the nearest hospital or the most similar object in a database. A large application is vector quantization, commonly used in data compression.
In geometry, Voronoi diagrams can be used to find the largest empty circle amid a set of points, and in an enclosing polygon; e.g. to build a new supermarket as far as possible from all the existing ones, lying in a certain city.
Voronoi diagrams together with farthest-point Voronoi diagrams are used for efficient algorithms to compute the roundness of a set of points.^{[12]} The Voronoi approach is also put to use in the evaluation of circularity/roundness while assessing the dataset from a coordinate-measuring machine.
Zeroes of iterated derivatives of a rational function on the complex plane accumulate on the edges of the Voronoi diagam of the set of the poles (Pólya's shires theorem^{[38]}).
In computer graphics, Voronoi diagrams are used to calculate 3D shattering / fracturing geometry patterns. It is also used to procedurally generate organic or lava-looking textures.
In autonomous robot navigation, Voronoi diagrams are used to find clear routes. If the points are obstacles, then the edges of the graph will be the routes furthest from obstacles (and theoretically any collisions).
In machine learning, Voronoi diagrams are used to do 1-NN classifications.^{[39]}
In global scene reconstruction, including with random sensor sites and unsteady wake flow, geophysical data, and 3D turbulence data, Voronoi tesselations are used with deep learning.^{[40]}
In user interface development, Voronoi patterns can be used to compute the best hover state for a given point.^{[41]}
Civics and planningedit
In Melbourne, government school students are always eligible to attend the nearest primary school or high school to where they live, as measured by a straight-line distance. The map of school zones is therefore a Voronoi diagram.^{[42]}
Bakeryedit
Ukrainian pastry chef Dinara Kasko uses the mathematical principles of the Voronoi diagram to create silicone molds made with a 3D printer to shape her original cakes.^{[43]}
Algorithmsedit
Several efficient algorithms are known for constructing Voronoi diagrams, either directly (as the diagram itself) or indirectly by starting with a Delaunay triangulation and then obtaining its dual.
Direct algorithms include Fortune's algorithm, an O(n log(n)) algorithm for generating a Voronoi diagram from a set of points in a plane.
Bowyer–Watson algorithm, an O(n log(n)) to O(n^{2}) algorithm for generating a Delaunay triangulation in any number of dimensions, can be used in an indirect algorithm for the Voronoi diagram. The Jump Flooding Algorithm can generate approximate Voronoi diagrams in constant time and is suited for use on commodity graphics hardware.^{[44]}^{[45]}
Lloyd's algorithm and its generalization via the Linde–Buzo–Gray algorithm (aka k-means clustering), use the construction of Voronoi diagrams as a subroutine.
These methods alternate between steps in which one constructs the Voronoi diagram for a set of seed points, and steps in which the seed points are moved to new locations that are more central within their cells. These methods can be used in spaces of arbitrary dimension to iteratively converge towards a specialized form of the Voronoi diagram, called a Centroidal Voronoi tessellation, where the sites have been moved to points that are also the geometric centers of their cells.
Voronoi in 3Dedit
Voronoi meshes can also be generated in 3D.
Random points in 3D for forming a 3D Voronoi partition
3D Voronoi mesh of 25 random points
3D Voronoi mesh of 25 random points with 0.3 opacity and points
3D Voronoi mesh of 25 random points convex polyhedra pieces
^Burrough, Peter A.; McDonnell, Rachael; McDonnell, Rachael A.; Lloyd, Christopher D. (2015). "8.11 Nearest neighbours: Thiessen (Dirichlet/Voroni) polygons". Principles of Geographical Information Systems. Oxford University Press. pp. 160–. ISBN 978-0-19-874284-5.
^Longley, Paul A.; Goodchild, Michael F.; Maguire, David J.; Rhind, David W. (2005). "14.4.4.1 Thiessen polygons". Geographic Information Systems and Science. Wiley. pp. 333–. ISBN 978-0-470-87001-3.
^Sen, Zekai (2016). "2.8.1 Delaney, Varoni, and Thiessen Polygons". Spatial Modeling Principles in Earth Sciences. Springer. pp. 57–. ISBN 978-3-319-41758-5.
^Aurenhammer, Franz (1991). "Voronoi Diagrams – A Survey of a Fundamental Geometric Data Structure". ACM Computing Surveys. 23 (3): 345–405. doi:10.1145/116873.116880. S2CID 4613674.
^Okabe, Atsuyuki; Boots, Barry; Sugihara, Kokichi; Chiu, Sung Nok (2000). Spatial Tessellations – Concepts and Applications of Voronoi Diagrams (2nd ed.). John Wiley. ISBN 978-0-471-98635-5.
^Boyd, Stephen; Vandenberghe, Lieven (2004). Convex Optimization. Exercise 2.9: Cambridge University Press. p. 60.{{cite book}}: CS1 maint: location (link)
^Tran, Q. T.; Tainar, D.; Safar, M. (2009). Transactions on Large-Scale Data- and Knowledge-Centered Systems. Springer. p. 357. ISBN 9783642037214.
^Senechal, Marjorie (1993-05-21). "Mathematical Structures: Spatial Tessellations . Concepts and Applications of Voronoi Diagrams. Atsuyuki Okabe, Barry Boots, and Kokichi Sugihara. Wiley, New York, 1992. xii, 532 pp., illus. $89.95. Wiley Series in Probability and Mathematical Statistics". Science. 260 (5111): 1170–1173. doi:10.1126/science.260.5111.1170. ISSN 0036-8075. PMID 17806355.
^Skyum, Sven (18 February 1991). "A simple algorithm for computing the smallest enclosing circle". Information Processing Letters. 37 (3): 121–125. doi:10.1016/0020-0190(91)90030-L., contains a simple algorithm to compute the farthest-point Voronoi diagram.
^Biedl, Therese; Grimm, Carsten; Palios, Leonidas; Shewchuk, Jonathan; Verdonschot, Sander (2016). "Realizing farthest-point Voronoi diagrams". Proceedings of the 28th Canadian Conference on Computational Geometry (CCCG 2016).
^Edelsbrunner, Herbert (2012) [1987]. "13.6 Power Diagrams". Algorithms in Combinatorial Geometry. EATCS Monographs on Theoretical Computer Science. Vol. 10. Springer-Verlag. pp. 327–328. ISBN 9783642615689.
^Sunil Arya, Sunil; Malamatos, Theocharis; Mount, David M. (2002). "Space-efficient approximate Voronoi diagrams". Proceedings of the thiry-fourth annual ACM symposium on Theory of computing. pp. 721–730. doi:10.1145/509907.510011. ISBN 1581134959. S2CID 1727373.
^Hölscher, Tonio; Krömker, Susanne; Mara, Hubert (2020). "Der Kopf Sabouroff in Berlin: Zwischen archäologischer Beobachtung und geometrischer Vermessung". Gedenkschrift für Georgios Despinis (in German). Athens, Greece: Benaki Museum.
^Laver, Michael; Sergenti, Ernest (2012). Party competition : an agent-based model. Princeton: Princeton University Press. ISBN 978-0-691-13903-6.
^Bock, Martin; Tyagi, Amit Kumar; Kreft, Jan-Ulrich; Alt, Wolfgang (2009). "Generalized Voronoi Tessellation as a Model of Two-dimensional Cell Tissue Dynamics". Bulletin of Mathematical Biology. 72 (7): 1696–1731. arXiv:0901.4469v1. Bibcode:2009arXiv0901.4469B. doi:10.1007/s11538-009-9498-3. PMID 20082148. S2CID 16074264.
^Hui Li (2012). Baskurt, Atilla M; Sitnik, Robert (eds.). "Spatial Modeling of Bone Microarchitecture". Three-Dimensional Image Processing (3Dip) and Applications II. 8290: 82900P. Bibcode:2012SPIE.8290E..0PL. doi:10.1117/12.907371. S2CID 1505014.
^ ^{a}^{b}Sanchez-Gutierrez, D.; Tozluoglu, M.; Barry, J. D.; Pascual, A.; Mao, Y.; Escudero, L. M. (2016-01-04). "Fundamental physical cellular constraints drive self-organization of tissues". The EMBO Journal. 35 (1): 77–88. doi:10.15252/embj.201592374. PMC4718000. PMID 26598531.
^Feinstein, Joseph; Shi, Wentao; Ramanujam, J.; Brylinski, Michal (2021). "Bionoi: A Voronoi Diagram-Based Representation of Ligand-Binding Sites in Proteins for Machine Learning Applications". In Ballante, Flavio (ed.). Protein-Ligand Interactions and Drug Design. Methods in Molecular Biology. Vol. 2266. New York, NY: Springer US. pp. 299–312. doi:10.1007/978-1-0716-1209-5_17. ISBN 978-1-0716-1209-5. PMID 33759134. S2CID 232338911. Retrieved 2021-04-23.
^Springel, Volker (2010). "E pur si muove: Galilean-invariant cosmological hydrodynamical simulations on a moving mesh". MNRAS. 401 (2): 791–851. arXiv:0901.4107. Bibcode:2010MNRAS.401..791S. doi:10.1111/j.1365-2966.2009.15715.x. S2CID 119241866.
^Kasim, Muhammad Firmansyah (2017-01-01). "Quantitative shadowgraphy and proton radiography for large intensity modulations". Physical Review E. 95 (2): 023306. arXiv:1607.04179. Bibcode:2017PhRvE..95b3306K. doi:10.1103/PhysRevE.95.023306. PMID 28297858. S2CID 13326345.
^Steven Johnson (19 October 2006). The Ghost Map: The Story of London's Most Terrifying Epidemic — and How It Changed Science, Cities, and the Modern World. Penguin Publishing Group. p. 187. ISBN 978-1-101-15853-1. Retrieved 16 October 2017.
^Mulheran, P. A.; Blackman, J. A. (1996). "Capture zones and scaling in homogeneous thin-film growth". Physical Review B. 53 (15): 10261–7. Bibcode:1996PhRvB..5310261M. doi:10.1103/PhysRevB.53.10261. PMID 9982595.
^Pimpinelli, Alberto; Tumbek, Levent; Winkler, Adolf (2014). "Scaling and Exponent Equalities in Island Nucleation: Novel Results and Application to Organic Films". The Journal of Physical Chemistry Letters. 5 (6): 995–8. doi:10.1021/jz500282t. PMC3962253. PMID 24660052.
^Fanfoni, M.; Placidi, E.; Arciprete, F.; Orsini, E.; Patella, F.; Balzarotti, A. (2007). "Sudden nucleation versus scale invariance of InAs quantum dots on GaAs". Physical Review B. 75 (24): 245312. Bibcode:2007PhRvB..75x5312F. doi:10.1103/PhysRevB.75.245312. ISSN 1098-0121. S2CID 120017577.
^Miyamoto, Satoru; Moutanabbir, Oussama; Haller, Eugene E.; Itoh, Kohei M. (2009). "Spatial correlation of self-assembled isotopically pure Ge/Si(001) nanoislands". Physical Review B. 79 (165415): 165415. Bibcode:2009PhRvB..79p5415M. doi:10.1103/PhysRevB.79.165415. ISSN 1098-0121. S2CID 13719907.
^Löbl, Matthias C.; Zhai, Liang; Jahn, Jan-Philipp; Ritzmann, Julian; Huo, Yongheng; Wieck, Andreas D.; Schmidt, Oliver G.; Ludwig, Arne; Rastelli, Armando; Warburton, Richard J. (2019-10-03). "Correlations between optical properties and Voronoi-cell area of quantum dots". Physical Review B. 100 (15): 155402. arXiv:1902.10145. Bibcode:2019PhRvB.100o5402L. doi:10.1103/physrevb.100.155402. ISSN 2469-9950. S2CID 119443529.
^"GOLD COAST CULTURAL PRECINCT". ARM Architecture. Archived from the original on 2016-07-07. Retrieved 2014-04-28.
^Lopez, C.; Zhao, C.-L.; Magniol, S; Chiabaut, N; Leclercq, L (28 February 2019). "Microscopic Simulation of Cruising for Parking of Trucks as a Measure to Manage Freight Loading Zone". Sustainability. 11 (5), 1276.
^Singh, K.; Sadeghi, F.; Correns, M.; Blass, T. (December 2019). "A microstructure based approach to model effects of surface roughness on tensile fatigue". International Journal of Fatigue. 129: 105229. doi:10.1016/j.ijfatigue.2019.105229. S2CID 202213370.
^Niu, Hanlin; Savvaris, Al; Tsourdos, Antonios; Ji, Ze (2019). "Voronoi-visibility roadmap-based path planning algorithm for unmanned surface vehicles" (PDF). The Journal of Navigation. 72 (4): 850–874. doi:10.1017/S0373463318001005. S2CID 67908628.
^Cortes, J.; Martinez, S.; Karatas, T.; Bullo, F. (April 2004). "Coverage control for mobile sensing networks". IEEE Transactions on Robotics and Automation. 20 (2): 243–255. doi:10.1109/TRA.2004.824698. ISSN 2374-958X. S2CID 2022860.
^Teruel, Enrique; Aragues, Rosario; López-Nicolás, Gonzalo (April 2021). "A Practical Method to Cover Evenly a Dynamic Region With a Swarm". IEEE Robotics and Automation Letters. 6 (2): 1359–1366. doi:10.1109/LRA.2021.3057568. ISSN 2377-3766. S2CID 232071627.
^Pólya, G. On the zeros of the derivatives of a function and its analytic character. Bulletin
of the AMS, Volume 49, Issue 3, 178-191, 1943.
^Mitchell, Tom M. (1997). Machine Learning (International ed.). McGraw-Hill. p. 233. ISBN 978-0-07-042807-2.
^Shenwai, Tanushree (2021-11-18). "A Novel Deep Learning Technique That Rebuilds Global Fields Without Using Organized Sensor Data". MarkTechPost. Retrieved 2021-12-05.
^Archived at Ghostarchive and the Wayback Machine: "Mark DiMarco: User Interface Algorithms [JSConf2014]" – via www.youtube.com.
^"Find my School". Victorian Government Department of Education. Retrieved 2023-07-25.
^Haridy, Rich (2017-09-06). "Architect turned cake-maker serves up mouth-watering geometric 3D-printed cakes". New Atlas.
^Rong, Guodong; Tan, Tiow Seng (2006). "Jump flooding in GPU with applications to Voronoi diagram and distance transform" (PDF). In Olano, Marc; Séquin, Carlo H. (eds.). Proceedings of the 2006 Symposium on Interactive 3D Graphics, SI3D 2006, March 14-17, 2006, Redwood City, California, USA. ACM. pp. 109–116. doi:10.1145/1111411.1111431. ISBN 1-59593-295-X.
de Berg, Mark; van Kreveld, Marc; Overmars, Mark; Schwarzkopf, Otfried (2000). "7. Voronoi Diagrams". Computational Geometry (2nd revised ed.). Springer. pp. 47–163. ISBN 978-3-540-65620-3. Includes a description of Fortune's algorithm.
Klein, Rolf (1988). "Abstract voronoi diagrams and their applications: Extended abstract". Computational Geometry and its Applications. Lecture Notes in Computer Science. Vol. 333. Springer. pp. 148–157. doi:10.1007/3-540-50335-8_31. ISBN 978-3-540-52055-9.
Lejeune Dirichlet, G. (1850). "Über die Reduktion der positiven quadratischen Formen mit drei unbestimmten ganzen Zahlen". Journal für die Reine und Angewandte Mathematik. 1850 (40): 209–227. doi:10.1515/crll.1850.40.209. S2CID 199546675.
Okabe, Atsuyuki; Boots, Barry; Sugihara, Kokichi; Chiu, Sung Nok (2000). Spatial Tessellations — Concepts and Applications of Voronoi Diagrams (2nd ed.). Wiley. ISBN 0-471-98635-6.
Reem, Daniel (2009). "An algorithm for computing Voronoi diagrams of general generators in general normed spaces". Proceedings of the Sixth International Symposium on Voronoi Diagrams in Science and Engineering (ISVD 2009). pp. 144–152. doi:10.1109/ISVD.2009.23. ISBN 978-1-4244-4769-5.
Reem, Daniel (2011). "The Geometric Stability of Voronoi Diagrams with Respect to Small Changes of the Sites". Proceedings of the twenty-seventh annual symposium on Computational geometry. pp. 254–263. arXiv:1103.4125. Bibcode:2011arXiv1103.4125R. doi:10.1145/1998196.1998234. ISBN 9781450306829. S2CID 14639512.
Thiessen, Alfred H. (July 1911). "Precipitation averages for large areas". Monthly Weather Review. 39 (7). American Meteorological Society: 1082–1089. Bibcode:1911MWRv...39R1082T. doi:10.1175/1520-0493(1911)39<1082b:pafla>2.0.co;2.
Voronoï, Georges (1908a). "Nouvelles applications des paramètres continus à la théorie des formes quadratiques. Premier mémoire. Sur quelques propriétés des formes quadratiques positives parfaites" (PDF). Journal für die Reine und Angewandte Mathematik. 1908 (133): 97–178. doi:10.1515/crll.1908.133.97. S2CID 116775758.
Voronoï, Georges (1908b). "Nouvelles applications des paramètres continus à la théorie des formes quadratiques. Deuxième mémoire. Recherches sur les parallélloèdres primitifs" (PDF). Journal für die Reine und Angewandte Mathematik. 1908 (134): 198–287. doi:10.1515/crll.1908.134.198. S2CID 118441072.
Watson, David F. (1981). "Computing the n-dimensional Delaunay tessellation with application to Voronoi polytopes". Comput. J.24 (2): 167–172. doi:10.1093/comjnl/24.2.167.
External linksedit
Wikimedia Commons has media related to Voronoi diagrams.