triangulation | image triangulation experiment | Computer Vision library

 by   snorpey JavaScript Version: Current License: MIT

kandi X-RAY | triangulation Summary

kandi X-RAY | triangulation Summary

triangulation is a JavaScript library typically used in Artificial Intelligence, Computer Vision applications. triangulation has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

image triangulation experiment ===. this is an experiment for the web browser. it uses the [delaunay triangulation] algorithm to alter an image. [triangulation experiment screen shot] screenshot.png)] this experiment is very much based on the [triangulation image generator] script. it includes several speed enhancements. it is my goal to make it fast enough for use with real time streaming input, e.g. from a [web cam] you can find another experiment that applies the triangulation to text input here: [triangulation effect code --- if you’re a developer and just interested in the code for the triangulation effect, there’s a separate repository for that: [triangulate-image] the build script
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            kandi-support Support

              triangulation has a low active ecosystem.
              It has 481 star(s) with 93 fork(s). There are 25 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 1 open issues and 5 have been closed. On average issues are closed in 820 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of triangulation is current.

            kandi-Quality Quality

              triangulation has 0 bugs and 0 code smells.

            kandi-Security Security

              triangulation has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              triangulation code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              triangulation is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              triangulation releases are not available. You will need to build from source code and install.
              It has 946 lines of code, 0 functions and 38 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed triangulation and discovered the below as its top functions. This is intended to give you an instant insight into triangulation implemented functionality, and help decide if they suit your requirements.
            • Find triangles of a polygon .
            • Creates a new COOL object .
            • Convert a color string to an array
            • The Triangle is a Triangle object .
            • Remove duplicate edges
            • Fake image data
            • Bind a function to a pixel value .
            • Create a common module .
            • Sorts by vector .
            Get all kandi verified functions for this library.

            triangulation Key Features

            No Key Features are available at this moment for triangulation.

            triangulation Examples and Code Snippets

            Iterates through the triangency to find the triangulation and find the midpoint .
            javascriptdot img1Lines of Code : 44dot img1License : Permissive (MIT License)
            copy iconCopy
            function hamiltonianCycleRecursive({
              adjacencyMatrix,
              vertices,
              verticesIndices,
              cycles,
              cycle,
            }) {
              // Clone cycle in order to prevent it from modification by other DFS branches.
              const currentCycle = [...cycle].map((vertex) => new G  
            copy iconCopy
            public List flipMatchVoyage(TreeNode root, int[] voyage) {
                    List flipped = new ArrayList<>();
                    index = 0;
                    dfs(root, flipped, voyage);
                    if (!flipped.isEmpty() && flipped.contains(-1)) {
                        flipped.cl  

            Community Discussions

            QUESTION

            TIN DSM Algorithm used in LidR package R
            Asked 2022-Mar-30 at 23:41

            I have a question regarding to the TIN method used in LidR. My point cloud data is look like this figure. When I compute DSM using TIN method, the height value is not at the highest peak of first return. Does the value used in triangulation is an average value from several first return within one pixel? Is there any ways to retrieve the DSM from the highest first return using LidR or another software? Thank you.

            • Michael -

            I am expecting to retrieve clarification about the TIN algorithm used to generate DSM in LidR package.

            ...

            ANSWER

            Answered 2022-Mar-30 at 23:41

            lidR triangulates the first returns and interpolates at the location of the centers of the pixels. So if a pixel is at the center of a triangle the value it returns is a linear combination of the elevation of the 3 points of the corresponding triangle. In your example the pixels look very big. Consequently the center of the pixel is somewhere in one of the many triangles encompassed by the pixel. It'd say it is relatively meaningless to compute a triangulation-based CHM with a resolution much larger than the average point spacing.

            If you want to make a CHM that correspond to the highest point use a point-to-raster based method i.e. p2r().

            Source https://stackoverflow.com/questions/71680036

            QUESTION

            Image to N triangles with minimum loss of the color
            Asked 2022-Mar-13 at 23:09

            Required to turn an image into N triangles with Delaunay triangulation. One color for each triangle, and colors can be repeated. The loss function is given by the square of the difference in the color of each pixel. So how to optimize the color and the vertices of triangles?

            ...

            ANSWER

            Answered 2022-Mar-13 at 23:09

            A recursive splitting procedure outline:

            Source https://stackoverflow.com/questions/71461235

            QUESTION

            3d triangulation working with DLT but not with projection matrix using cv2.triangulatePoints
            Asked 2022-Mar-10 at 21:27
            Outline

            I have a calibrated stereo camera setup with the 11 DLT coefficients for each camera (coefficients estimated using the easyWand package that uses a 'wand' calibration object moved across the scene). 3D projection using the DLT method and the obtained coefficients works fine and produces sensible results (see figure below).

            Obtained parabolic trajectory of a thrown object using DLT triangulation (plot has been rotated to align with gravity)

            However, when I convert the DLT coefficients into a Projection matrix (P, where x = P X, where x is the 2d pixel coordinates, P is a 3x4 matrix and X is a homogenous 4x1 matrix with object 3d coordinates included) - the 'shape' of the trajectory makes sense but the values don't (values close to ~0.01 for x,y,z).

            Obtained trajectory using Projection matrix based method cv2.triangulatePoints(plot has been rotated to align with gravity)

            Can anyone please explain why the Projection matrix based method produces oddly scaled coordinates or what is being done wrong here?

            The discrepancy doesn't make sense as the DLT coefficients and projection matrix are inter-convertible (e.g. see this link).

            Data and code to replicate the results: ...

            ANSWER

            Answered 2022-Mar-02 at 11:07

            The stacking of the coefficient should be of the below format.

            Source https://stackoverflow.com/questions/71319515

            QUESTION

            CDT C++ library: How to define an edge?
            Asked 2022-Mar-05 at 15:38

            I'm trying for a while to define an edge in CDT. Below is my code. The first function works fine, but the compilation of the second function throws this error: no matching function for call to CDT::Edge::Edge(). I also attempted numerous other trials, with no luck.

            ...

            ANSWER

            Answered 2022-Mar-05 at 15:38

            Edge does not have a default constructor, so you can’t give a vector an initial size (since that would require each element to be initially default-constructed). Instead, make the vector empty to begin with (you can reserve() capacity for it if you like) and then add edge with push_back()… or, better yet, construct it in-place with emplace_back().

            Source https://stackoverflow.com/questions/71363478

            QUESTION

            matplotlib triplot and tricontourf
            Asked 2022-Feb-11 at 20:23

            I'm attempting to plot a 2D dataset having unstructured coordinates in matplotlib using tricontourf. I'm able to generate a plot of the 'mesh' with triplot, however when I use the same Triangulation object for tricontourf, I get an error (see below). What am I missing? Example:

            ...

            ANSWER

            Answered 2022-Feb-11 at 20:23

            I would say you need to provide the array of values to contour, e.g.:

            Source https://stackoverflow.com/questions/71083687

            QUESTION

            Calculating the area of a simple polygon
            Asked 2022-Jan-26 at 15:19

            given a polygon P, i want to calculate the area of the polygon.

            my solution: find a triangulation, and sum all the area of the triangles.

            Total time complexity: o(nlogn).

            Does there exist a better solution?

            ...

            ANSWER

            Answered 2022-Jan-26 at 15:19

            You don't need to explicitly decompose, use the shoelace formula. It is easy and O(n).

            https://en.wikipedia.org/wiki/Shoelace_formula

            The method generalizes to the computation of geometric moments

            https://en.wikipedia.org/wiki/Second_moment_of_area#Any_polygon

            Source https://stackoverflow.com/questions/70862069

            QUESTION

            Matplotlib Triangulation: more triangles than vertices
            Asked 2022-Jan-07 at 06:27

            I want to create an unstructured triangular grid, and I have two files: for vertices and triangles. The problem is that Matplotlib Triangulation method requires the length of array of vertices and the length of array of triangles being same, but my data has more triangles than vertices. So, instead of full grid I can get only part of it (skipping the tail of triangles array).

            My output:

            Expected output:

            Vertices array:

            ...

            ANSWER

            Answered 2022-Jan-07 at 06:27

            You don't have to provide the indices of the triangles: by default, matplotlib can automatically generate them using a Delaunay triangulation (see the documentation), and this should be sufficient for your data.

            Source https://stackoverflow.com/questions/70617100

            QUESTION

            delaunator not drawing all triangles on a p5js sketch
            Asked 2021-Dec-27 at 22:19

            Im trying to port this sketch: https://codepen.io/giorgiomartini/pen/JjrOVXq?editors=1010 which uses a similar library: https://cdn.rawgit.com/ironwallaby/delaunay/master/delaunay.js, but I get only one triangle.

            Here is my code: https://github.com/GiorgioRemindme/giorgio-martini/blob/main/src/sketches/tris.js

            I think this is the problematic part:

            ...

            ANSWER

            Answered 2021-Dec-27 at 22:19

            QUESTION

            How to find the Delaunay neighbours of points in two different sets using scipy's Delaunay?
            Asked 2021-Dec-19 at 20:42

            See https://docs.scipy.org/doc/scipy/reference/generated/scipy.spatial.Delaunay.html

            Consider two sets of points. For each point in X_, I would like to find the nearest delaunay neighbours in "points". I think a slow way is to form Delaunay triangulations of points plus a points from X_ one at a time and then do the neighbours lookup somehow. Is there a more efficient way of doing this using scipy (or another tool)?

            ...

            ANSWER

            Answered 2021-Dec-19 at 20:42

            Ideally, the simplest solution would probably look something like this:

            Source https://stackoverflow.com/questions/69967953

            QUESTION

            How to save triangulation object(Constrained_Delaunay_triangulation_2) to file(vtk, vtu, msh etc) in CGAL
            Asked 2021-Dec-18 at 23:15

            Created simple program based on 8.3 Example: a Constrained Delaunay Triangulation. And just wanna to export it to some common mesh file format like vtk, msh etc, to be able open it in GMesh or ParaView. To do so I found that most straightforward way is to use write_VTU. And at the beginning and at the end of example code I added next:

            ...

            ANSWER

            Answered 2021-Dec-17 at 08:16

            As documented here the face type of the triangulation must be a model of DelaunayMeshFaceBase_2. You can for example use Delaunay_mesh_face_base_2 like in this example.

            Source https://stackoverflow.com/questions/70383755

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install triangulation

            You can download it from GitHub.

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            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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