PTGUI and DJI drones

[imag...@gmail.com]

DJI drones 360 images are a bit strange in PTGui, perhaps other 360 stichers too.

The DJI drones I work with most take 26 images for a 360. Typically PTGui aligns these pretty much automatically in there proper place, but adding control points helps the alignment. .

However, PTGui does not add control points to many adjacent images. For example images 1 and 25 are typically next to each other but never have control points between the two unless added by selecting the two in the add control points.

This is typical on many image pairs that are either far from each other in sequence or vertical.

No question, just a FYI if your not getting the results your expecting.

DJI drones also have very strange xml data about exposure.

[PTGui Support]

Usually the problem is the drone is drifting somewhat. This drift
accumulates, so the first and the last image can be taken from
significant different viewpoints. As a result PTGui may struggle to find
control points between those images.

The method of Q5.6 usually helps when stitching these panoramas:
https://www.ptgui.com/support.html#5_6

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[Jean-Pierre Bouville]

Hello,

Absolutely right.

I use both Mavic and P4pro and as i saw ( hundred panoramas with 42 images, so time for things to slightly move…) there is always shifts between the first and the last images. I use to begin always at the opposite of the sun for that reason. PTGui does a really great job, saving us many hours of job, but for a « good » result, adding points and masks takes always the same time, 2 or 3 hours of job.

Regards,

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[imag...@gmail.com]

One of the main drone problems is they rotate around the center of the drone instead of the lens. why not one of the drone makers understands this is a core issue.

But, PtGui simply does not do a great job of assigning control points to image pairs when auto aligning. It seems to not assign points to images taken far apart and even next to each other when vertical images pairs are processed. This can be manually fixed by simply using the control point assign control points to n and n images and it pretty much always finds lots of points. But Why?

The guide you noted are out of date for 12.n version as with the modern seams method, which is amazing, viewpoint correction is not possible.

[John Houghton]

On Friday, October 29, 2021 at 11:03:39 PM UTC+1 imag...@gmail.com wrote:

The guide you noted are out of date for 12.n version as with the modern seams method, which is amazing, viewpoint correction is not possible.

Could you please clarify.  What do you mean by "the modern seams method"?  Why is viewpoint correction not possible?

John 

[imag...@gmail.com]

Hi John, in the 12 version of PTGui a new seams method was implemented, it quite amazing to me at least, instead of pretty much just using the center of the images it zigs and zags finding the least  points of difference. And perhaps I'm missing something in the new menus but I see no way to use viewpoint correction when using the new seam method.  Hope that helps.

But with my latest project from a drone in a urban setting that should not have been shot as the winds were so strong that even the DJI system was saying land the drone now, it was shot anyway. So lots of issues to say the least. But much to my complete shock PTGui - auto alignments by simply loading the images without adding control points of DJI shots - produced  a better "stitch" vs adding control points. Adding control points in the auto assistant and images already aligned methods produced much more significant stitching errors vs just loading the images.

[John Houghton]

On Saturday, October 30, 2021 at 9:34:06 PM UTC+1 imag...@gmail.com wrote:

Hi John, in the 12 version of PTGui a new seams method was implemented, it quite amazing to me at least, instead of pretty much just using the center of the images it zigs and zags finding the least  points of difference. And perhaps I'm missing something in the new menus but I see no way to use viewpoint correction when using the new seam method. 

"Find optimum seams"  and Viewpoint Correction are independent features and there is no reason why you should not use both together.  You choose the blending method on the fly-out menu of the Panorama Editor window, while viewpoint correction is set on the Advanced page of the Optimizer tab.  I regularly use both features when handling offset nadir shots, so I'm puzzled by what you say.

John

[imag...@gmail.com]

I don't see any option in the Advanced page of the Optimizer tab in 12.n for viewpoint. correction. I only see reset or optimize in the pull down for each image.

[imag...@gmail.com]

And as what seems like forever, thank you for your insight and help, You are one of the true benefactors of 360. I only wish you the best.

[imag...@gmail.com]

OK, I think I understand now after reading your preseason a few times, will try, thanks as always.

[imag...@gmail.com]

damn auto fill "response" not preseason.

[John Houghton]

On Saturday, October 30, 2021 at 10:11:51 PM UTC+1 imag...@gmail.com wrote:

I don't see any option in the Advanced page of the Optimizer tab in 12.n for viewpoint. correction. I only see reset or optimize in the pull down for each image.

The column heading for the reset & optimize choices does say "Viewpoint".    See viewpoint tutorials for more info if you have not already done that.

John 

[PTGui Support]

You can simply follow the steps of 5.6:
https://www.ptgui.com/support.html#5_6

It works as described in PTGui Pro 12 and it usually improves the
stitching significantly if the drone was moving.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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