Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [point-cloud]

A Point cloud represents a set of data points in space, generally produced by 3D scanners, and used in CAD models, metrology, animation, etc.

0
votes
0answers
13 views

Cutting 3D Point cloud and interpolate between points

I have the following data https://www.mediafire.com/file/f8tz1zbpxvyvko7/Waltersdorf_F3.csv/file Which is a 3D point cloud. I can visualize it correctly, but I want to do Cuts like the ones in the ...
0
votes
0answers
18 views

Transforming point cloud into a coordinate system

I have unknown point clouds that I need to find the rotation angle or the transformation matrix that align that point cloud into X-Z plane. picture Note that there are bears(columns) that can be used ...
0
votes
0answers
16 views

Find radius of best fit cylinder from cloud

I want to find the radius of the cylinder that best fits a cloud of points. I used 3DReshaper to calculate the radius of the best fit cylinder for this points (format: x y z): ...
1
vote
1answer
26 views

Direction vector of tube/cylinder from point cloud

I have a bunch of points that lay on a surface on a cylinder/tube. How can I calculate the properties of this tube (radius and direction)? The only way I can come up with is to assume find the ...
1
vote
1answer
231 views

Points inside a 3D rectangle [duplicate]

my task is to find, and mark, all the points from a point cloud that are inside a 3D rectangle. I have the coordinates of all the 8 vertices. Is there a mathematical formula which I can use? To be ...
0
votes
1answer
44 views

matrix to transform set of point to another set of points

I would like to start by saying that I'm not an expert mathematician, neither an expert in English and that's why I have so much problems at present. What I'm trying to do is to generate 2 matrix R ...
0
votes
0answers
53 views

Object segmentation in PCL

Sorry because I am not sure if this question fits here. I am new working in object recognition and localisation. I am using PCL to capture a model of an object and localise it. It works well. I ...
0
votes
0answers
64 views

(LP problem) Find an optimal plane that contains a set of points in its positive half-space, such that it does not coincide with another plane

Given is a set of points $S = \{s_1,...,s_N\in\mathbb{R}^n\}$ and a plane $H_1$ with $H_1^+ = \{ x \in \mathbb{R}^n ~\vert~ n_1^Tx - b_1 \geq 0\}$ being its positive half-space, such that $\forall s\...
3
votes
2answers
160 views

Why does the Eigen decomposition of the covariance matrix of a point cloud give its orientation?

I am working with point clouds and one of the problems I had to face was to find the orientation of a given cluster. Most algorithms I have found suggest that one must first calculate the centroid of ...
0
votes
0answers
30 views

How to generate a non-closed surface from point cloud?

I want to reconstruct a non-closed surface from a point cloud, for example, a tube. But currently, most reconstruction algorithms generate watertight surfaces. point cloud of a tube To my study if ...
1
vote
0answers
97 views

Discrete first and second fundamental forms

I want to calculate first and second fundamental coefficients for some points in a point cloud (sampled surface), I used this method (https://arxiv.org/abs/1601.07272) but in this, only three closest ...
0
votes
0answers
23 views

How to get the bounding ellipsoid of a three-dimensional points data-set?

I have a three-dimensional point cluster and I have to calculate its height, width and depth. Using an axis aligned bounding box is not an accurate way of doing this, because the object given by the ...
2
votes
0answers
58 views

calculating first and fundamental form coefficients with surface normal and Gaussian curvature

I have some points (point cloud), I need first and second fundamental form coefficients at each point. before I used some polynomial surface fitting algorithm then these coefficients were calculated....
0
votes
0answers
22 views

How to get the cartesian form of a plan from its Hesse form?

This class provides the necessary tools to find a plane in a point cloud using the RANSAC algorithm; the plane is defined in Hesse normal form, meaning that it returns an array of four cells: the ...
0
votes
0answers
84 views

Region Growing Based Segmentation in PCL

When we make region growing based cluster in point cloud library. we view the can view the all the indices of all clusters. i want to view the $x, y, z$ points of these indices. can we view this? if ...
4
votes
2answers
599 views

Robust orientation of a point cloud

I have 2D point clouds which are 4-way symmetrical (invariant by 90° rotation). The points are usually arranged on the nodes of a square grid, densely populated, but some cases can be more complicated....