triangulation | image triangulation experiment | Computer Vision library
kandi X-RAY | triangulation Summary
kandi X-RAY | triangulation Summary
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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Top functions reviewed by kandi - BETA
- 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 .
triangulation Key Features
triangulation Examples and Code Snippets
Lines of Code : 44License : Permissive (MIT License)
Copyfunction 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 
License : No LicenseCopypublic 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
Trending Discussions on triangulation
QUESTION
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 23:41lidR 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().
QUESTION
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 23:09A recursive splitting procedure outline:
QUESTION
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 11:07The stacking of the coefficient should be of the below format.
QUESTION
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 15:38Edge 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().
QUESTION
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 20:23I would say you need to provide the array of values to contour, e.g.:
QUESTION
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 15:19You 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
QUESTION
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 06:27You 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.
QUESTION
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 22:19You are re-drawing the background every time you draw a Triangle: https://github.com/GiorgioRemindme/giorgio-martini/blob/main/src/sketches/tris.js#L92
QUESTION
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 20:42Ideally, the simplest solution would probably look something like this:
QUESTION
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 08:16As 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.
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