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Questions tagged [3d-reconstruction]

In computer vision and computer graphics, 3D reconstruction is the process of capturing the shape and appearance of real objects.

This tag should be used for programming issues related to 3D reconstruction in the field of computer vision.

3D reconstruction consists in creating a 3-dimensional model of an object or scene from several 2-dimensional images of it.

366 questions
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How to 3d reconstruct robustly from multiple images with known poses in OpenCV

The traditional solution for high resolution images examples : extract features (dense) for all images match features to find tracks through images triangulate features to 3d points. I can give two problem here for my case (many 640*480 images…
Yasin Yousif
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Averaging SIFT features to do pose estimation

I have created a point cloud of an irregular (non-planar) complex object using SfM. Each one of those 3D points was viewed in more than one image, so it has multiple (SIFT) features associated with it. Now, I want to solve for the pose of this…
John B
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How to compute the true depth given a disparity map of rectified images?

I have calculated a disparity map for a given rectified stereopair! I can calculate my depth using the formula z = (baseline * focal) / (disparity * p) Let's assume that the baseline, focal length and pixel constant p are known and I used the same…
Miau
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how to merge point cloud, after triangulation

I am working on Structure from Motion. I have did the following steps till now. Feature Matching Fundamental Matrix Essential Matrix Camera Matrix P From triangulation, I got Point3d type values for all the matched features. I stored this in…
justPassBy
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For 3D reconstruction, is it better to align stereo cameras horizontally vs. vertically?

Typically 3D reconstruction is done by aligning 2 cameras horizontally. What are the downsides, if any, of aligning cameras vertically?
megashigger
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How to fill the holes in 3D image reconstructed from binary images of CT slides in Matlab

I have around 200 CT slides from patients and need to reconstruct them and segment out the eye orbit. In Matlab, I read the original DICOM image, use imbinarize(I,T) to change them to binary image, and then stack them up to form the 3D orbital image…
Ringo QED
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Graph cut based on visibility

According to the following figure, a surface mesh can be extracted using an Energy function = L, where L is number of intersection of a triangle. Graph Cut algorithm I would like to know how would I construct the graph and apply cut to it using…
andre
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Basic space carving algorithm

I have the following problem as shown in the figure. I have point cloud and a mesh generated by a tetrahedral algorithm. How would I carve the mesh using the that algorithm ? Are landmarks are the point cloud ? Pseudo code of the algorithm: for…
andre
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Space carving of tetrahedra

I have been reading this paper http://openaccess.thecvf.com/content_iccv_workshops_2013/W21/papers/Sugiura_3D_Surface_Extraction_2013_ICCV_paper.pdf I have already generated a tetrahedra for my mesh and I would like to create a surface mesh. I can't…
andre
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Stereo map using Post-filtering

I tried using the code to find the disparity given in the link: link However the disparity map appears to be wrong in some areas. Some objects far from the camera appear to be brighter than the closer objects. I tried to calculate the actual depth…
Abhilesh Borode
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Projective to Metric Reconstruction with known Intrinsics

I already have a projective reconstruction of a scene from three images taken with the same camera (that is, I reconstructed the camera matrices and the points coordinates in the projective frame; one of the three camera matrices is a cononical…
JuaniL
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Generating depth map with panda3d

I need to generate test data for 3d reconstruction code. For this I decided to use panda3d. I am able to create simple app and see the scene. Now I need to create depth map for the scene, i.e. for each pixel on the screen I need to calculate depth,…
Stepan Yakovenko
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3D reconstruction using stereo camera

I try to construct 3D point cloud and measure real sizes or distances of objects using stereo camera. The cameras are stereo calibrated, and I find 3D points using reprojection matrix Q and disparity. My problem is the calculated sizes are changing…
M.E.
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How to detect shape of an object using multiple images?

I have two side views ( say Left & Right) of an object. How to get the shape or size of the object using the 2 (if not multiple) images. Is there any geometric constraints methods or feature recognition methods to do so? The below are sample left &…
Pushpa
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How can i obtain Camera Matrix in 3Dreconstruction?

I want to achieve a 3D-reconstruction algorithm with sfm, But how should i set the parameters of the Camera Matrix? I have double cameras,both know their focal length. And how about Rotation Matrix and Translation Matrix from world view? i use…
Wang.J
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