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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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Can Lidar be used to construct 3D Model from the captured data?

In photogrammetry, we stich together 2 Images to reconstruct 3d model. But in Lidar we also have depth maps of the object. Shouldn't that make 3d reconstruction of an object a lot faster compared to photogrammetry ? I tried searching 3D Model…
Mohak Gupta
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OpenCV; Is it possible to get the 3D world coordinates of a point relative to an ArUco marker?

I am able to get the pose of an ArUco marker, detect the tip of my index finger, then draw a line from a target_corner of the marker to the finger point, using OpenCV and MediaPipe, as seen in the image below. Test Image I am simply curious if it is…
sorenKdev
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Error While Estimating Fundamental Matrix of a set of Images

I am Currently Working on a project related to Sfm Photogrammetry using Python OpenCV Library.I extracted and matched the Features using SIFT Algorithm. I tried to find the fundamental matrix by taking each keypoints and matches from adjacent points…
James Lee
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quantify accuracy of model reconstructed in Meshroom based on ground points?

I have ground points placed in the scene with known Pw for each point in the world coordinate system. The P_m in the model coordinate system is calculated from the reconstructed model. However, the O_w and O_m are not aligned. O_w and O_m are world…
Ali Waqas
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Bundle adjustment with focal length correction not converging

I am trying to add a new feature to our existing implementation of the bundle adjustment in code. The algorithm uses the Gauss-Newton method and has been working for well over a decade. The least squares "A" matrix is populated using initial…
Gary Allen
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Open Access data

I wanted to know if it is possible to find open access Lidar and Photogrammetry data for the same area. I came across OpenTopography where thee are plenty of Lidar or Photogrammetry data, but is it possible to search for both sources of data for one…
MariaM
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Autodesk Reality Capture API - resulting model not produced after processing photoscene

I'm trying to run Autodesk's Reality Capture API (Autodesk-Forge/recap-walkthrough-photo.to.3d on GitHub) locally on my laptop. Everything works until a certain point - I authorize, create a photoscene, upload the images, and begin processing all…
jokeefe
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Threejs Coordinates not matching with the coordinates of the Intesects of the Ray Caster

// Step 1 this.camera = new THREE.PerspectiveCamera(10,aspectRatio,0.0001,100000) this.camera.position.x = 2; this.camera.position.y = 2; this.camera.position.z = 2; // Step 2 this.scene = new THREE.Scene(); …
govindu saiprasad
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Solving for transformation parameters between two 3D point clouds

I have a set of points (x1,y1,z1) and I would like to transform them to another coordinate system which has points (x2,y2,z2). I would like to calculate the scale factor, 3 rotations and 3 translations. I know we have to use absolute orientation and…
ABh
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Locating objects in FOV of an image using GPS only

Is it possible to locate objects in an image in the global reference frame (e.g. ECEF) using only a GPS (offset from the camera) ? The problem I see is that in order to take into account the offset distance between GPS antenna phase center, an IMU…
Sam Gomari
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How to deploy Apple's Object Capture API in the cloud

The Apple Object Capture API is currently only available as a MacOS API. I'm looking to host this API in the cloud so it is accessible as a REST API. This way, I can send images from an app to our cloud database (Firebase Firestore) and process the…
ufoaz
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how to project a point defined in real world coordinates to image plane and vice-versa?

I prepared a toy experiment to project a point defined in the world frame to the image plane. I'm trying to calculate the 3D point (inverse-projection) with the calculated pixel coordinates. I used the same coordinate frames as the figure below…
A. G. Gelen
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Internal Coordinate System in Agisoft Metashape

What does internal coordinate system mean in Agisoft Metashape ? I have taken some images with the drone and they contain coordinates in WGS84 CRS. In Metashape documentation, I read that there is possibility to convert from internal CRS to…
Villa
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Rate of change in pixel coordinates during camera rotation (near vs far subjects)

Lets say a camera is spinning around horizontally with its axis of rotation at the center of the camera lens. Do subjects farther away from the camera have a different rate of change in photo x coordinate than subjects closer to the camera when…
Imightbehigh
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How to Convert distorted points to undistorted points?

Distorted image from camera We have a distorted image from the camera. We were trying to undistort the image, which was partially solved by calculating the calibration data -> calibration matrix & distortion coefficients; & putting the same in cv2's…
Caliber X
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