stitching two circular fisheye images

[giuseppe...@gmail.com]

Hi,
I would like to use hugin to stitch 2 circular fisheye image.
I have a sony a5000 aps-c camera and I would like to buy a meike 6.5mm circular fisheye lens for sony aps-c sensor.
The image will fit into the sensor as a circle image, FOV is 190 degrees as stated in lens specs.

Should I only insert the lens specs or I need some other specific settings (or procedure) in order for Hugin to stitch properly two images in one equirectangular 360x180 image?

Thank you.

Giuseppe

[Bruno Postle]

Hugin can't automatically detect the empty black areas outside the image circle, so you need to select a 'circular fisheye' lens and manually mark the circle in the crop tab.

Hugin will calculate all the other lens parameters for you. Though I recommend initially stitching a panorama with more photos and more overlap for better parameters, and then saving these parameters for future panoramas.

--
Bruno

[giuseppe porciani]

Thank you very much.
I am a newbie so please excuse me if the following is meaningless:
is there any way to "automate" the circle image marking after first
instance, i.e. saving somehow the procedure and/or by way of a script?
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[Greg 'groggy' Lehey]

On Friday, 5 April 2019 at 7:14:20 -0700, giuseppe...@gmail.com wrote:
> Hi,
> I would like to use hugin to stitch 2 circular fisheye image.
> I have a sony a5000 aps-c camera and I would like to buy a meike 6.5mm
> circular fisheye lens for sony aps-c sensor.
> The image will fit into the sensor as a circle image, FOV is 190 degrees as
> stated in lens specs.

I don't have anything to add on the procedure, but maybe a thing to
think about: what do you have from a circular fisheye lens? It may
have other purposes, but for Hugin you will probably find it easier
with a full frame (field of view, not sensor size) fisheye. I do that
on a regular basis, and I don't have to do anything specific (once I
have initially told Hugin that it's a fisheye lens, so that it can
note it in its database).

> Should I only insert the lens specs or I need some other specific
> settings (or procedure) in order for Hugin to stitch properly two
> images in one equirectangular 360x180 image?

Even with the Meike, you won't get that from two images. Assuming
that you really get your 190°, that's only horizontally. My program
tells me that you won't get that vertically, and you need some
overlap:

Focal length: 6.50 mm
Horizontal FOV: 208.03°
Diagonal FOV: 249.86°
Vertical FOV: 138.39°
Panorama steps (30% overlap):
Horizontal: 146°
Vertical: 97°

The angles beyond 190° are theoretical; that's the part that's blacked
out. And the sample images I've seen, such as at
https://www.dpreview.com/forums/thread/4121672 , confirm this. It
suggests that you'll need at least 6 images to get a full 360x180
panorama.

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[Bruno Postle]

Hugin will save the position of the image circle along with all the other lens parameters, so you only have to place it once.

--
Bruno