automated stitching

[Daniel Baertschi]

We are about to create a solution to continuously stitch images 7x24. The solution setup looks as follow:

Camera/lens: Nikon Z-series with Nikkor 14-30/4S, typically focal length around 20mm

Camera mounted vertical, rotated around nodal point. Horizonal repositioning 0.01 degree absolute.

Number of images typically between 8 to 10

Aperture, ISO and shutter speed gets automatically adjusted by own algorithm over the course of the day

Images are taken in manual mode. Image luminosity and color temperature is fixed for all images per panorama

Stitching with Hugin 2019.1 7x24 every 10 to 20 minutes based on a predefined project

Live example: https://feed.yellow.webcam/feed/44M64QO4X

We experience little issues except visible blending issues and are searching for advice. We usually adjust aperture first and keep shutter speed fast and ISO at fair level to avoid motion blur and get good image quality. Typical camera locations are on cable car poles and roof tops. Every test location shows little motion, either due to sunshine or wind speed sometimes exceeding 200 km/h. We understand the negative impact of larger aperture but cannot avoid it to get sharper images especially on windy days and at nighttime.

 

What can you recommend to lower blending issue? What parameter shall we tackle to get maximum benefit?

• Correction of vignetting before stitching
• Calculating lens distortion
• Lens calibration
• Optimize blending

Anyone experience with automated stitching 7x24?

Thanks

Daniel

[Gunter Königsmann]

As the images are taken at different points in time and from a different perspective I would guess that the shadow from a cloud that makes one part of the border of one image dark, but doesn't do the same to the same region in another image will cause photometrics to go wild occasionally if it tries to make the two brigjtnesses match. Also basically what you do is what the "stitching murals" tutorial does do => any checkpoint on nearby features will show a different parallax error than a point in the horizon.

As the question was if the images can be made sharper: does making more pictures and trying to make an HDR image help? This might average out some noise, but overlaying more images might produce ghost images of everything with an parallax error.

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[Gunter Königsmann]

...and there was an emblend option to prefer the sharpest image parts for the final image. I don't remember how it was named, though.