Incremental Alignment v1.4 b5650

[n@sk]

Anyone else having problems with the Incremental Alignment of images?

Key points are stored, reset alignment is unchecked but

sometimes it works and sometimes it detects features in the new set but the old matches are removed
so no new matches, just the original images still aligned but without the sparse point cloud...

[Alexey Pasumansky]

Hello n@sk,

Seems like the same issue has been discussed:
http://www.agisoft.com/forum/index.php?topic=7913.0

The "keep key points" option should be checked on before the initial alignment has been generated. If you open the project generated in the older versions or without that flag enabled, no key points are available in the project.

[n@sk]

Hi Alexey,

Thanks for your response but I think that you have misunderstood the question.

The option is always checked.
An initial alignment of a subset of the images is created.
Resetting and realigned those that failed to align doesn't make a difference,
so I remove them and then re-import them to initiate the incremental alignment.
Now, this sometimes works fine (new features are detected and the re-imported images are aligned with the rest)
but sometimes it keeps the alignment of the first subset, but removes their sparse point cloud and the new images have detected features which are not matched.
The result is the first subset aligned (without sparse pcloud) and the additional subset not aligned with detected features but no matches, not even between them.

When I align the first subset alone and then add the second one, it usually works.
However, the points is not to do this twice so that we can  figure out which subset will fail and process it sequentially.

regards

Please also consider the 'Duplicate chunk' option for the key points
http://www.agisoft.com/forum/index.php?topic=8265.0

[Alexey Pasumansky]

Hello n@sk,

We have tried to reproduce the issue, and it appears that the original sparse cloud (original tie points) is lost only if the alignment has been performed without keeping key points.

As for the your suggestion in the feature requests forum, we'll consider that. We are checking all feature requests, even if no answer is given in the thread.