Newbee: How to activate images?

[Kai Mewes]

Hello to the esteemed experts from a newbee,
in the scientific community I have often been presented the successful use of Hugin.
Unfortunately, in my case it appears the hugin workflow in the output or stitcher tab is buggy in the latest German version under macOS 10.14 as well as in the the latest Hugin- Win 10 application.
It is about multiline scans under linear, professional studio conditions. As an experienced computer user, but not an IT expert, I believe I have worked through all the relevant tutorials to professionally merge four very cleanly worked sections with exemplary
control points.
All the more regrettable then, when stitching them together, the error message:

"There are no active images in the area defined for output.

Please check settings so that at least one image is in this area."

All four files are marked or selected as a batch in the "Photos" and "Optimize" tabs.
What then please is meant by "defined area for output"? And: what do I have to do to activate them?

As additional info, I could not do the "quick panorama preview", because under the tabs "Assistant", "Preview", "Projection", "Move/Drag" and "Crop" only an empty window with grid without images appears, but the control points are pointed out in the upper right corner as follows:
"The images are connected with 599 control points. Mean error after optimization: 0.0 pixels, max 0.0".
Under "Layout" I see one of the four tiles, when I click on it a white frame appears briefly.
All this had led me to believe I could do without the "quick panorama preview", assuming the final calculation would have enough information for a very good result.

I hope the translations are clear, thanks for support where the small error lies with me,

Kai

[T. Modes]

Kai Mewes schrieb am Samstag, 27. Februar 2021 um 22:03:12 UTC+1:

As additional info, I could not do the "quick panorama preview", because under the tabs "Assistant", "Preview", "Projection", "Move/Drag" and "Crop" only an empty window with grid without images appears, but the control points are pointed out in the upper right corner as follows:
"The images are connected with 599 control points. Mean error after optimization: 0.0 pixels, max 0.0".

599 control points with max error of 0 sound very suspicious. Also that image is displayed. There is probably something went wrong during optimisation. Can you provide the pto file? Otherwise it is very difficult to say.

[Kai Mewes]

Hi T. Modes,

thank you for the quick answer.

Attached the .pto-file

As a conclusion of how I worked in both operating systems, I strictly followed the Hugin tutorial - "Stitching flat scanned images". The big difference in the macOS version is that with autopano-sift-C the control points were created automatically, in the Win version no control points were created by itself. That would be again a next question in a separate thread, how that could work.
Although no control points had been created under Win, after the "Stitch now!" command the same error message as under macOS.

Sorry, with attached .pto file I can not post here ?!

Thank you,
best regards

[Kai Mewes]

Sorry, with attached .pto file I can not post here ?!

T. Modes schrieb am Sonntag, 28. Februar 2021 um 08:28:31 UTC+1:

[T. Modes]

Kai Mewes schrieb am Sonntag, 28. Februar 2021 um 11:38:59 UTC+1:

Sorry, with attached .pto file I can not post here ?!

That should work, at least with the web interface.

Otherwise use a file hoster or cloud solution and post the link.

[Kai Mewes]

OK, after another bug in web interface here is a Link:

http://gofile.me/3EsgO/pqnKN2ic6

[T. Modes]

Ok, the problem is that you optimized the translation parameters of all images at one. You need to optimize TrXYZ of all images except the first (or another anchor) and add roll as optimisation parameter:

* So reset all translation parameters (select all images and choose reset parameters from context menu)

* Then go to the optimizer tab, deselect TrX/TrY/Try of the first image

* Then disable optimize field of view (v) and set v to 10 deg (now it is about 28 deg).

* Go to the projection tab in the fast preview window or the stitcher tab and select projection rectilinear (as written in the tutorial)

* Now optimize again.

PS: There is also a user defined assistant which does the steps as described in the tutorial. It works also with your project when you first reset the translation parameters.

[Kai Mewes]

Thanks for engaging with my details!, that works well now :)

I think the tutorial is at this point a bit ambiguous for me.

Do you think 10° wil be better than 28° ? the number 28 was suggested based on the specified focal length of each tile.

[T. Modes]

Kai Mewes schrieb am Sonntag, 28. Februar 2021 um 19:43:47 UTC+1:

I think the tutorial is at this point a bit ambiguous for me.

I have not written the tutorial. But I think you missed the point to use "select all" from the context menu and instead selected all manually. The context menu is shown in the screenshot directly under the text.

Do you think 10° wil be better than 28° ? the number 28 was suggested based on the specified focal length of each tile.

 I assumed you have used scanned images (and not photographed ones) and used the 10 deg as in the tutorial.