• Ultraviolet Photography
  •  

Helianthus annuus (Vis, UV, SWIR 1500-1600nm, IRG, 850nm IR, UVIVF)

Fluorescence Infrared Multispectral Processing SWIR
5 replies to this topic

#1 Andy Perrin

    Member

  • Members(+)
  • 2,459 posts
  • Location: United States

Posted 16 August 2019 - 20:16

A classic sunflower. The SWIR is the major contribution here, because many sunflowers have been imaged before on this forum. I made a 530 image panorama to get adequate resolution, and the results look nice. It took all night to stitch the images, and I went through 5 software packages before I found one that didn't get bogged down by the sheer number of images involved. Most stitching programs are geared toward a small number of images with a large number of pixels, rather than the opposite situation, which is what I have with the TriWave!

Vis
sunshine Resolve 60mm lens, F8 iso640 0.04" (DB850+S8612 1.75mm)
Attached Image: _DSC3100 sunshine Resolve60mm F8 iso640 0.04%22 Vis (DB850+S8612) UVP.jpg

UV
sunshine Resolve 60mm lens, F8 iso2500 2"
Attached Image: _DSC3092 sunshine Resolve60mm F8 iso2500 2%22 UV UVP.jpg

Vis
sunshine Resolve 60mm lens, F8 iso640 0.04" (DB850+S8612 1.75mm)
Attached Image: _DSC3099 sunshine Resolve60mm F8 iso640 0.04%22 Vis (DB850+S8612) UVP.jpg

UV
sunshine Resolve 60mm lens, F8 iso2500 2"
Attached Image: _DSC3097 sunshine Resolve60mm F8 iso2500 2%22 UV UVP.jpg

UVIVF
ConvoyS2+ Sony FE 55mm lens, F8 iso1000 30"
Attached Image: _DSC3121 ConvoyS2+ SonyFE55mm F8 iso1000 30%22 UVIVF UVP.jpg

IRG
sunshine Resolve 60mm lens, F8 iso400 0.005" (DB850+Tiffen #12)
Attached Image: _DSC3104 sunshine Resolve60mm F8 iso400 005%22 IRG (DB850+Tiffen12) aerochrome UVP.jpg

Near infrared (830-870nm)
sunshine Resolve 60mm lens, F8 iso400 0.05" (DB850+Hoya R72)
Attached Image: _DSC3105 sunshine Resolve60mm F8 iso400 0.05%22 IR850 (DB850+HoyaR72) UVP.jpg

SWIR (1500-1600nm)
halogen Thorlabs 50mm achromatic doublet, F10-ish, not sure how to quantify the rest of the exposure info. Thorlabs 1500nm long pass filter.

534 image panorama stitched with Panorama Stitcher, a Mac app available in the Mac App Store. This was the program that finally worked after trying Hugin, PTGui, Photoshop CS6, Panoweaver, and Autopano Giga. Autopano Giga's free trial actually worked, but when I went to buy it, I discovered that Kolor, the company that made it, had been bought by GOPro, which then discontinued the product! With no way to unlock the software, I had to find another program.

Due to stitching errors near the edges, I was forced to crop this more than I would have liked. The results are still pretty nice, though, and I found that the sunflower (as with other members of the aster family) has a dark center in the SWIR 1500-1600nm band, despite being pretty uniformly white in the 850nm NIR range.
Attached Image: pic2 take 2 small_res UVP.jpg

Edited by Andy Perrin, 16 August 2019 - 20:20.


#2 dabateman

    Da Bateman

  • Members(+)
  • 1,108 posts
  • Location: Maryland

Posted 17 August 2019 - 03:33

Andy,
Nice images. The IRG and UVIVF are my favorites.
I am surprised that Hugin didn't work. Did it crash or couldn't handle the stack?

It maybe an odd way to go but I would think based on your SWIR camera an Astrophotography software like Deep Sky Stacker (DSS) or Nebulocity, would be better. You have a web camera resolution with 500 or more images, thats basically what an Astrophotography software is designed to handle. However, I don't know what is best for the Mac. I think DSS is Windows only, but I might be wrong.

#3 Andy Perrin

    Member

  • Members(+)
  • 2,459 posts
  • Location: United States

Posted 17 August 2019 - 03:36

Hugin hung and wouldn’t go past a certain point. I will look into the astrophotography software. I was actually considering looking at what microscopy people do with theirs.

#4 dabateman

    Da Bateman

  • Members(+)
  • 1,108 posts
  • Location: Maryland

Posted 17 August 2019 - 04:46

I did some digging. Interesting that Autopano is based on Auto stick, a University of British Columbia software:
http://www.matthewal...autostitch.html

However, all the licensed commercial packages are dead. People are trying to patition GoPro to make it open source. But a better bet may be to ask the UBC uderline developers.

Also from search of Astro forums the most recommended software was Autopano giga, Hugin and PTGui pro.
Hugin may error if you don't have 40% overlap, lots of ram or lots of storage for the temp files.

In the microscopy world we call this tiling. ImagJ plugins is always what I would use. I will have to see now whats out. Its been well over 10 years. Fiji or ImageJ 2.0 may have something. The dedicated slide scanners, that I used that were good had Zeiss zen software, that was custom to the instrument.

Yes still seems active for 2Dto 5D sticking. See:
https://imagej.net/Image_Stitching

Edited by dabateman, 17 August 2019 - 04:56.


#5 Andy Perrin

    Member

  • Members(+)
  • 2,459 posts
  • Location: United States

Posted 17 August 2019 - 11:46

Yes, I looked into the microscopy side yesterday and found that ImageJ link. I downloaded it but I’m out of town till Tuesday so I won’t have a chance to try it.

Hugin probably ran out of RAM. I have 16GB but maybe that was not enough. In my opinion the Autopano software is the best.

Edited by Andy Perrin, 17 August 2019 - 11:48.


#6 Andrea B.

    Desert Dancer

  • Owner-Administrator
  • 7,404 posts
  • Location: USA

Posted 20 August 2019 - 15:22

Nice work on the Sunflower, Andy. It's always good to find out how one's gear handles the classic reflected-UV reference flower (UV-dark center bull's-eye and all that).
Andrea G. Blum
Often found hanging out with flowers & bees.