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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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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…
JVarga
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how to Save ARKIT scanned resources on server?

I am scanning AR enviornment using ARKit. If i save it on device or app bundle AR apps work perfectly. What i want is to save AR resources on some kind of server and sync that resources while user using app.
gaurav_mobile
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create 3d model of an equipment from 2d images

GOAL: I have to create a 3d model of a machine part. I have about 25 images of the same thing taken from different angles. Progress: I am able to extract the coordinates for a label that is on the machine for most of the images. Problem: but I have…
Yash Sharma
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How to determine distance of objects from camera using Epipolar Plane Image?

I am working on converting 2d images to 3d environment. The images were collected from a video made in a lateral motion. Then the images were placed one behind the other, so it would be easy to find the correspondences between the two images. This…
Pete
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Photogrammetry, Width and height ratio of rectangle in image

How do I get the width and height ratio of a sheet of paper (or some other rectangular thing) from an image? Here is an example/image that maybe makes my question a bit clearer, https://i.stack.imgur.com/3TcJn.jpg . I know the coordinates of the…
lijas
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Measuring non-planar objects in image

I'm working on a computer vision application (using openCV) and the goal is to measure the width of an obejct before/after it falls on a container. So after the fall its position will be random, something like this to be clear: candies The only…
David
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Creating targets for Photogrammetry applications

Cheers, I am developing a photogrammetry application and I will likely be using one of the commercial packages (like Photomodeler or Acute3D). I believe all of these programs come with a capability for automatic target detection. The user prints…
user3614305
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Correcting a GoPro's barrel distortion using multiple still images?

I have a large 2000 frame series of night sky images taken from a gopro hero3. Which is in itself silly because GoPros have bad low light performance. I've done some light math on the images, and identified star position "arcs" over the 2 hour…
Benjamin H
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Is Camera Calibration needed to get measurements from an image?

I am working on an android application that measures distances (euclidean distances) from a digital image. I know that in order to get real world measures like cm or meters I have to use an object with a known dimensions. Is Camera Calibration…
xuandl
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Pose estimation with emgu

I would like to do pose estimation of a chessboard target using emgu. I have already determined the camera intrinsics. However, I can't find the solvePnP function in emgu which I think should solve my problem. Does anybody know how I could find this…
Goosebumps
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Extracting descriptive information from a LiDAR cloud (.las files)

I have .las (lidar data) file, now I wanted to know the size of it, for example how long it's width and height in kilometers. How is it possible to retrieve these kind of info?
asel
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Determining camera parameters

Given a picture taken by a simple digital that contains an image of a rectangle of known dimensions. How can I - to some degree of accuracy - determine the parameters of this camera? I am mostly interested in Pan-, Tilt- and Swing…
dwergkees
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Dense pixelwise reverse projection

I saw a question on reverse projecting 4 2D points to derive the corners of a rectangle in 3D space. I have a kind of more general version of the same problem: Given either a focal length (which can be solved to produce arcseconds / pixel) or the…
Jim McC
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