# \#3dreconstruction **URL:** https://forum.opencv.org/tag/3dreconstruction/166.md [Latest](https://forum.opencv.org/latest.md) · [Categories](https://forum.opencv.org/categories.md) · [Tags](https://forum.opencv.org/tags.md) --- ## [What is the arbitrary scaling factor s in camera calibration?](https://forum.opencv.org/t/what-is-the-arbitrary-scaling-factor-s-in-camera-calibration/19391)
**Author:** [@blauertee](https://forum.opencv.org/u/blauertee)\ **Replies:** 8\ **Last updated:** [November 28, 2024, 6:55pm UTC](https://forum.opencv.org/t/what-is-the-arbitrary-scaling-factor-s-in-camera-calibration/19391 "2024-11-28T18:55:38Z")
I’m trying to figure out what size an object at distance d from the camera would have in pixels. In my understanding this is exactly what the camera matrix should do. Given a 3d Point (x,y, d) it should project that poi… --- ## [Problem with disparity map or stereo calibration](https://forum.opencv.org/t/problem-with-disparity-map-or-stereo-calibration/17631)
**Author:** [@watermelon0guy](https://forum.opencv.org/u/watermelon0guy)\ **Replies:** 0\ **Last updated:** [May 12, 2024, 9:40pm UTC](https://forum.opencv.org/t/problem-with-disparity-map-or-stereo-calibration/17631 "2024-05-12T21:40:43Z")
Good day to everyone. I’ve been trying to solve the problem of surface reconstruction for some time now. I built a sparse point cloud using a simple triangulation. I still want a dense point cloud, so I decided to try di… --- ## [Get 3d world coordinates given 2D pixel coordinates and a reference depth](https://forum.opencv.org/t/get-3d-world-coordinates-given-2d-pixel-coordinates-and-a-reference-depth/15568)
**Author:** [@Mcolmc28](https://forum.opencv.org/u/Mcolmc28)\ **Replies:** 0\ **Last updated:** [November 18, 2023, 11:24am UTC](https://forum.opencv.org/t/get-3d-world-coordinates-given-2d-pixel-coordinates-and-a-reference-depth/15568 "2023-11-18T11:24:01Z")
Hi there, I am new to computer vision and am working on a project where I need to estimate the depth of a bus user from a camera. I have been able to successfully detect user faces and have got their pixel coordinates. … --- ## [Depthmap to 3D-Mesh](https://forum.opencv.org/t/depthmap-to-3d-mesh/10809)
**Author:** [@Flockchain](https://forum.opencv.org/u/Flockchain)\ **Replies:** 0\ **Last updated:** [November 4, 2022, 9:03am UTC](https://forum.opencv.org/t/depthmap-to-3d-mesh/10809 "2022-11-04T09:03:28Z")
Hello Guys, I am working on an iOS-Application and want to create a 3D-Mesh out of my captured Depthmaps. Theres no limit for the amount of my textures. I know that its possible to include OpenCV in my project, but befo… --- ## [Cant understand triangulatepoints 3d points results](https://forum.opencv.org/t/cant-understand-triangulatepoints-3d-points-results/9502)
**Author:** [@Ali\_El\_habchi](https://forum.opencv.org/u/Ali_El_habchi)\ **Replies:** 0\ **Last updated:** [July 14, 2022, 11:44am UTC](https://forum.opencv.org/t/cant-understand-triangulatepoints-3d-points-results/9502 "2022-07-14T11:44:30Z")
Hi everyone, I’m using opencv triangulatePoints to estimate 3d position of the matched keypoints between two images using the estimated Essential matrix, but when i try to visualise the resulted 3d points after converti… --- ## [Stereo : getting 3D position in left camera frame](https://forum.opencv.org/t/stereo-getting-3d-position-in-left-camera-frame/9105)
**Author:** [@felixn](https://forum.opencv.org/u/felixn)\ **Replies:** 0\ **Last updated:** [June 9, 2022, 1:17pm UTC](https://forum.opencv.org/t/stereo-getting-3d-position-in-left-camera-frame/9105 "2022-06-09T13:17:55Z")
Hi, I’m working on a stereo setup. I use getOptimalNewCameraMatrix followed by stereoRectify and initUndistortRectifyMap to get my undistortion/rectification maps. Then, on the undistorted images, I match some feature… --- ## [Opencv visual odometry example](https://forum.opencv.org/t/opencv-visual-odometry-example/8605)
**Author:** [@MakeItGreatAgain](https://forum.opencv.org/u/MakeItGreatAgain)\ **Replies:** 1\ **Last updated:** [May 2, 2022, 7:57am UTC](https://forum.opencv.org/t/opencv-visual-odometry-example/8605 "2022-05-02T07:57:46Z")
Hello, I actually want to ask the way computing the trajectory of visual odometry. I have been searching for an official example of visual odometry but didn’t get it. Finally, I found in an independent repository at Git… --- ## [Visual odometrys give different results](https://forum.opencv.org/t/visual-odometrys-give-different-results/7960)
**Author:** [@MakeItGreatAgain](https://forum.opencv.org/u/MakeItGreatAgain)\ **Replies:** 0\ **Last updated:** [March 16, 2022, 2:51am UTC](https://forum.opencv.org/t/visual-odometrys-give-different-results/7960 "2022-03-16T02:51:34Z")
Hello, In my project, I tried using visual odometry of OpenCV including RGBDOdometry, ICPOdometry and RGBDICPOdometry. I use two images and their depth images to do test with each of the 3 odometries. It seems only RGBD…