Questions tagged [point-cloud]
The point-cloud tag has no usage guidance.
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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)...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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).
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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 ...
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