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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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Should a chessboard/charuco board take up most of the image when performing camera calibration?

I've spent some time trying to calibrate two similar cameras (ExCam IPQ1715 and ExCam IPQ1765) to varying degrees of success, with the eventual goal of using them for short-range photogrammetry. I've been using a charuco board, along with the OpenCV…
Tom
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How to check whether Essential Matrix is correct or not without decomposing it?

On a very high level, my pose estimation pipeline looks somewhat like this: Find features in image_1 and image_2 (let's say cv::ORB) Match the features (let's say using the BruteForce-Hamming descriptor matcher) Calculate Essential Matrix (using…
Milan
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OpenCV: What does it mean when the number of inliers returned by recoverPose() function is 0?

I've been working on a pose estimation project and one of the steps is finding the pose using the recoverPose function of OpenCV. int cv::recoverPose(InputArray E, InputArray points1, InputArray …
Milan
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fitting ellipse in images with poor contrast

I am working on image processing in Python, on the topic of underwater photogrammetry. My goal is to fit an ellipse to fidicual markers, and retrieve its a) center, b) axis and c) orientation. My markers are radial, white on black background, and…
dejhost
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Using the Object Capture API with the camera of the Android device

Can I take photos from an android device or any camera instead of an ipad or iphone while using the Object Capture API? What negative side effects can it have. Note: I'm asking this question because I noticed that the size of the usdz model has…
Muhammed Emin Aydın
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Meshroom Meshing node fails with "Depth map fusion gives an empty result"

I have a photogrammetry pipeline in Meshroom (lightly modified from the default). The pipeline fails on the Meshing node with the error "Depth map fusion gives an empty result." My StructureFromMotion node found 3,172,414 points from 731 images. My…
jhaiduce
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Reconstruction failed Error with HelloPhotogrammetry

I'm trying to create a USDZ object with the tutorial from Apple Creating 3D Objects from Photographs. I'm using the new PhotogrammetrySession within this sample project: Photogrammetry Command-Line App. That's the code: let inputFolderUrl =…
Jonas Deichelmann
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OSGB - number of tiles per file

I have OSGB models that are created with either software: AgiSoft, Bentley, SkylineSoft, Pix4D. Currently each tile in the output folder is divided into at least two files, one osgb and one or several texture file (jpg). I have a problem in the…
user2012707
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How can we create hemisphere shape in SceneKit's scene?

I need to create a hemisphere (dome) Shape in ARKit/SceneKit scene, we have SCNSphere basic shape in SceneKit, but not sure how to create hemisphere (dome). Immediate reply will be appreciated.
Amit Singh
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for a 3x3 camera matrix, could skew factor be negative?

for a 3x3 camera matrix, could skew factor be negative? assume the camera matrix is in the form : [fx s u0] [0 fy v0] [0 0 1 ] could s be negative?
C graphics
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ARKit keypoints in image coordinates (2D)

Description of the "issue": I want to use keypoints (a.k.a. tie points) between two successive images from an Apple smartphone using ARKit but I can't find these. I can find 3D values in world reference frame from the ARPointCloud or…
swiss_knight
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Are there cameras that capture not only color but the actual depth?

Getting into 3D reconstruction techniques, I'm curious whether there are cameras that capture not only color but the depth at the moment of image being captured. It would appear that getting the depth of a particular pixel on the sensor would be far…
Detuned
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How to extract a PCD file from my own images?

I'm using the PCL library link with Ubuntu 17.04. I'd like to know if there's a way to create a .pcd file from my personal images. Every tutorials I've found use pregenerate pcd. Thanks in advance.
Simone Colnaghi
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Problems in focusing when calibrating a DSLR

I am using 2 CANON EOS60ds as a stereo setup to do Photogrammetry. I am using OpenCV to calibrate both the cameras using a high precision Circlegrid calibration pattern. I am using a signal generator to trigger both cameras at the same time, earlier…
the_parzival
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Get 3d model from few photos

I want to get a 3d model (even if it's not perfect) from a few photos that are already taken (for example, from a film). I would get some frames of a place in a film and then I want to get the 3d Model. I've searched some tools and I've found…
Daniel Roca Lopez
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