Questions tagged [structure-from-motion]
72 questions
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Place cube in structure-from-motion output Bundler and then determine the coordinates of a newly placed cube corners?
I have generated output of structure-from-motion system for unordered image collections by Bundler.
Now I want to place a cube in the 3D generated space by some GUI and then get the coordinates of the corners of the cube in world coordinate system.…
Swapnil.Das
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3d reconstruction without instinct camera parameter(exif) or Ground Control Points (GCPs)
I want to get a 3d point cloud from two images without camera intrinsic parameters or GCPs, but I could not figure out how to get it. Software such as Agisoft or Pix4d gets scale-free point cloud without this information, but I want to get it with…
gunen
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Unable to run programs of SFM module in OpenCV
I am getting an error when I am trying to execute a sample code in SFM module. Initially SFM was not present in my contrib directory. So i downloaded the latest contrib and pasted the sfm folder in my contrib directory. I used the CMakeLists.txt…
Shubham Lohakare
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Detecting/correcting Photo Warping via Point Correspondences
I realize there are many cans of worms related to what I'm asking, but I have to start somewhere. Basically, what I'm asking is:
Given two photos of a scene, taken with unknown cameras, to what extent can I determine the (relative) warping between…
Jabberwock
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How do orthographic and perspective camera models in structure from motion differ from each other?
Under the assumption that the camera model is orthographic, how do orthographic and perspective camera models in structure from motion?
Also, how do these techniques differ from each other?
Anas El-wakil
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3d reconstruction from 2 views
I'm doing some study on the 3d reconstruction from two views and fixed known camera focal length. Something that is unclear to me is does triangulation gives us the real world scale of an object or the scale of the result is different to the actual…
Ali Ghazi
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Scene reconstruction under rotation and little camera movement
I'm trying to implement some kind of object detection with depth measurement using a mono-camera which is mounted near by the center of rotation of a door. The basic idea is to detect objects in front of the door (when swinging up) and create a…
Matthias Preu
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Exception while computing Essential Matrix with OpenCV
I am following the chapter 4 for Structure from Motion from the book Mastering OpenCV. I am currently trying to compute the Essential Matrix for two views using the Fundamental Matrix. This statement
Mat_ E = K.t() * F * K;
is causing an…
jaykumarark
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Structure from motion using sparse bundle adjustment
I don't have calibrated camera,I have taken stereoscopic images from web.
I wanted to create structure from motion of the images,So I was lookin at Tsai's algorithm and Sparse Bundle adjustment.
But,I got struck while finding camera parameters.What…
Gunjan naik
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What are some good sources for tutorials on structure from motion using OpenCV in Python?
I am working on a project for my thesis, and it requires implementation of the structure from motion technique to create point cloud models of . However, is it possible to define the point cloud model numerically?
troymyname00
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Computing depthmap from 3D reconstruction model
I'm using VisualSfM to build the 3D reconstruction of a scene. Now I want to estimate the depthmap and reproject the image. Any idea on how to do it?
Hercules
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How to color the 3D points cloud
I've tried to do 3d reconstruction using multiple images and I also have my camera intrinsics params. I used SFM in Matlab the 3D points are the same color, I wonder how can I visualize the 3D points in their own color similar to the color in…
shelman
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