Questions tagged [point-cloud]

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Elevation angle estimation from L-shaped antenna array

I have TI IWR6843ISK-ODS radar sensor and need point cloud data as output from it. The antenna arrangement is as follows: I would like to know how to estimate elevation angle with this antenna ...
Pushkar Mahajan's user avatar
1 vote
1 answer
51 views

Using nearest neighbor in RANSAC

I found many resources online talking about nearest neighbor concept in RANSAC. For example, figure 2 of this paper, this article and this repo talk about nearest neighbor in the context of RANSAC. ...
RajS's user avatar
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1 answer
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Finding rectangle corners by using point cloud

I have a rectangle in the 3D scene, which I know its width and height. It is placed in the 3D scene like the image below. I can manually select all points on the rectangle by mouse click. Given the ...
CVDE's user avatar
  • 103
2 votes
1 answer
237 views

Registration of point cloud based on feature matching method

I recently find myself an interesting problem to solve. Basically I got 2 partially overlapped point clouds (in real world) that I want automate the registration process. My naive approach currently ...
Anh Tran's user avatar
2 votes
0 answers
21 views

What is the name of the filter or technique to reduce depth aliasing around object edges when working with camera depth?

I'm working with a point cloud, created by sampling a 2D camera texture and a depth map. The color is combined with the depth and is projected onto a 3D scene to create a "point cloud". The ...
Alex Stone's user avatar
0 votes
1 answer
2k views

Making a 3D point cloud from multiple RGB-D images

I have multiple (4 kinect) cameras that give RGB-D (color and depth) information of the same scene from different points of view. I want to make a 3D point cloud out of these depth maps. I can get a ...
Kiarash Farivar's user avatar
1 vote
0 answers
232 views

Can LiDaR be used for volume measurement? [closed]

I need to measure volume with LiDaRs. However, they seem to only capture the surface of an object. More precisely, the surface that is seen by the sensor. Therefore, the cloud point data that it ...
PPP's user avatar
  • 111
0 votes
0 answers
34 views

Combining Multiple Point Clouds

I have a car with 8 lidars, each with a field of view of 60 degrees. My car looks like this How can I merge all the lidar readings into 1 point cloud?
Josh Goldman's user avatar
0 votes
1 answer
732 views

Multiple-image dense point cloud reconstruction with camera extrinsics/intrinsics

I have the following data available: Images from different angles X, Y, Z, pitch, yaw, and roll for each camera/image, together with the timestamp Lens distortion parameters and intrinsic camera ...
chris's user avatar
  • 111
1 vote
2 answers
6k views

Is it possible to make 3D point cloud with RADAR?

Is it possible to make 3D point cloud with RADAR? Both LIDAR and RADAR are EM waves, but with different wavelength. So, if it is technically possible to make point clouds with LIDAR, why is it not ...
infoclogged's user avatar
0 votes
1 answer
953 views

Determining the covariance of point clouds in real-time

So basically I have a set of multidimensional data that I need to determine the covariance of between dimensions in real-time. Each point that comes in is a vector. I have gotten the mean and variance ...
Jonathan's user avatar
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1 vote
1 answer
499 views

Point cloud comparison

Let me preface this question with the fact that two hours ago I had no idea what a cloud point was. I do however have a solid mathematical background although geometry has never been my focus. I do ...
Jan van der Vegt's user avatar
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2 answers
822 views

Image distortion and alignment on 3D mesh / pointcloud

Currently I have a fairly accurate (50 µm) and large dataset from a 3D scanner and a set of high resolution pictures. Sadly the 3D scanner (a Nikon/Metris arm-based CMM that was hanging around the lab)...
Bart Plovie's user avatar
0 votes
1 answer
58 views

Processing line scanner data

I have a line scanner output that is scanning the geometry of a surface. Typically the output looks something like this: Where the x and y axis refers to the coordinate system in mm. (ignore the red ...
John Tan's user avatar
  • 123
3 votes
1 answer
238 views

Can the Z-Transform be used to create smoothed 3D surfaces from point clouds?

According to Dr. Math the Z-transform can create closed-form solutions for 1D series defined by difference equations (e.g. the Fibonacci series). My 3D surface $z=LC(x,y)$ is defined by difference ...
zQAycX's user avatar
  • 43
0 votes
1 answer
272 views

Why is the backprojection of the Middlesbury depth map "cone shaped"?

I wrote some come to backproject depth maps. Testing it with the Middlebury cone set, I get: First of all it has noise, which I shouldn't get from the ground truth, but more importantly it seems like ...
aledalgrande's user avatar
0 votes
1 answer
963 views

3D point cloud to 2.5D graycale image (metric) [Halcon?]

I have a problem ragarding transferring a point cloud to a 2.5D metric grayscale image (gray value gives depth information). I start with a three channel image of 32bit floats with each pixel ...
e_mka's user avatar
  • 11
2 votes
2 answers
2k views

What exactly do we do in non-rigid registration?

I found many readings on Non rigid registration, also saw some videos but didn't find a clear explanation anywhere. What I understood is the following Rigid ...
Shashwat's user avatar
  • 121
2 votes
2 answers
5k views

Calculating the volume of a triangular mesh?

I have an unorganized point cloud with a bunch of 3d points. I use a certain surface reconstruction method to obtain a triangle mesh of the underlying surface. The surface could be closed or not. Can ...
Mustafa's user avatar
  • 420
8 votes
4 answers
656 views

How to: pixel packs in an image to representative point coordinates (x,y)

Let's have an image (gray-scale or even binary) as shown on the following figure at the left hand side, the goal is to generate a list of points i.e., coordinates in the form of (x,y) for each pack of ...
Developer's user avatar
  • 1,129
15 votes
1 answer
5k views

Detection of circles (ellipses) in 2D point cloud

Given a set of points (2D) i.e., point cloud (PC), the question is about a robust, accurate and ...
Developer's user avatar
  • 1,129
8 votes
2 answers
8k views

Detection of lines in a point cloud

What are the best solutions to detect line in a point cloud? Comparison being made with and between Hough Transform, Radon Transform, RANSAC (see wikipedia) and Brute-Force Search (see wikipedia). ...
Developer's user avatar
  • 1,129
15 votes
2 answers
3k views

Profile Matching in a Point Cloud

A point cloud is generated using uniform random function for (x,y,z). As shown on the following figure, a flat intersecting plane (profile) is being investigated ...
Developer's user avatar
  • 1,129