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Questions tagged [photogrammetry]

Photogrammetry is the practice of determining the geometric properties of objects from photographic images.

Photogrammetry is the practice of determining the geometric properties of objects from photographic images. Photogrammetry is as old as modern photography and can be dated to the mid-nineteenth century. Photogrammetry uses methods from many disciplines, including optics and projective geometry.

http://en.wikipedia.org/wiki/Photogrammetry

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Measuring height of a playing card deck in an image

I am writing a module for a casino surveillance software. A bit of context: I have several images from a video extracted at different times. I have a reference deck always at a fixed position that I know the size of. Assuming that the distortion,…
PU2014
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OpenCV + photogrammetry

i have a stereopair, photo 1: http://savepic.org/1671682.jpg photo 2: http://savepic.org/1667586.jpg there is coordinate system in each image. How can I find coordinates of point A in this system using OpenCV library. It would be nice to see sample…
V1t
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Meshroom: how to access the final camera parameters?

I am trying to write a script which loads the camera parameters from Meshroom and imports them into a CAD program. My first understanding was that these parameters (position, rotation matrix, focal length etc.) are contained in the JSON-file…
thorst
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COLMAP photogrammetry: Reconstruction gives only point cloud, no mesh

I've been trying to use COLMAP to produce 3D meshes from photographs, but all I can get is useless point clouds. I've studied various YouTube tutorials, but the results I get differ from what I am seeing, mainly in that I can never get a solid 3D…
Mentalist
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ARKit Photogrammetry

For the last month, I have been researching ways to create 3D reconstructions from live video. It seems to me like the only option is to use a 3rd party service like Agisoft or Autodesk Capture. However, after the release of ARKit 2.0, I saw this…
Nikhil Sridhar
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error while loading shared libraries: libgfortran.so.1: wrong ELF class: ELFCLASS32

I'm trying to use the Structure From Motion example from here (SFM by Nghiaho). I'm having some problem with the second part of the run process: I've downloaded the PMVS2 (Patch-based Multi-view Stereo Software) from here pmvs2 doc. I've opened the…
Simone Colnaghi
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Computing orientation of a square and displaying an object with the same orientation

I wrote an application which detects a square within an image. To give you a good understanding of how such an image containing such a square, in this case a marker, could look like: What I get, after the detection, are the coordinates of the four…
Robin
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Finding the angle of a perspective image

I'm working on a floor design app that allows the user to pick preset floor images and view them within a preset room image. My problem is I'm struggling to get the perspective of the floor image to match the room image properly. I have played…
WagglyWonga
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Library for getting a camera angle via a marker

I'm searching for a library similar to ARToolKit. It needs to support processing a single image and search that image for a marker. If it finds one I want it to return the camera angle / viewpoint based of the marker. I couldn't find anything via…
Robin
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WPF 3-D performance for head-tracking app

I’m working on creating a full-screen 3-D app (based on Johnny Lee's Wii head tracking app) with some augmented reality features, and it seems that WPF is too slow to render even the simple models I’m using at a reasonable frame rate. I think the…
Jonathan Schuster
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How can I stitch together many images to provide a 3D immersive experience like Photosynth?

I'd like to create a Photosynth like experience that allows a user to navigate around a virtual environment from a collection of many pictures. For this project I'm limited to using WPF / .NET to create the application. Ideally I'd like a…
James Cadd
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Extracting surveillance camera positions from streetview images

Related to my previous question, is there some realistic chance to extract surveillance camera positions out of google streetview pictures by means of computer vision algorithms? I'm no expert in that area. But it should be easier than face…
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opengl lookup matrix to camera extrinsic matrix

I am trying to render 3D point cloud from the depth data which I saved from opengl framebuffer. Basically, I took different depth samples from different n viewpoints (which are already known) for the rendered model centered at (0, 0, 0). I…
Rajat Sharma
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Interpreting the rotation matrix with respect to a defined World coordinates

In the image bellow, we see a defined world plane coordinate (X,Y,0) where Z=0. The camera as we can see is heading towards the defined world plane. World reference point is located on the top left of the Grid (0,0,0). The distance between every two…
Khaled
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How to convert Euler angles and altitude of drone camera to coordinates of image center?

I'm trying to calculate the real world 3D-coordinate of the center pixel of image taken with a drone. I have the longitude, latitude, altitude, and Euler angles (yaw, pitch and roll) of the drone. The ground is assumed to be flat (sea level, since…
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