Topics

1

General / Validate invalid matches

« on: September 01, 2020, 07:11:42 PM »

I have got a bunch of underwater sequential photographies, which basically just needs stiching based on sequential reference. However out of 550 images, only 11 are aligned. When I look at the matches for an image, many many features are matched correctly, see attached image.

This holds true for my entire dataset, but I cannot in any possible way get Metashape to do a good job.

Is there any way that I can manually validate the matches that are found, but not used?

2

General / Alignment errors

« on: May 21, 2019, 04:40:54 PM »

I have a sequence of images from a line with more than 80% overlap. I have very high accuracy in the positions of each image along with yaw, pitch and roll.
I have included everything as a reference for the images in the model, but when it aligns it can only align a very small fraction of the images and in these it completely alters the position of images (almost upside down/rolled).

Does anybody have a clue as to why this is?

3

General / Use camera positions embedded in the image information

« on: January 07, 2019, 03:21:24 PM »

I am fairly new to PhotoScan and I am running in to some undesired behavior.

Background:
We use PhotoScan to generate Orthomosaics of images taken of the seabed underwater with autonomous underwater vehicles. For each image the position and altitude is embedded and the navigation accuracy of our vehicle is extremely accurate, so the task should be as simple as "overlaying" the images. I have more than 90% overlap in each image and good detailed conditions.

Current situation:
When I try to align a set of images it first of all takes almost an hour for less than 300 images. Next up the alignment process completely skews the image positions, puts them at different altitudes, rotations and positions. I do not understand why this is even possible when all needed information regarding positions of the images is already embedded in the images.
See the two included images for reference.

I hope someone has the expertise to help me with this.