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Author Topic: thermal images multi camera system process  (Read 710 times)

r02mr18

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thermal images multi camera system process
« on: February 05, 2021, 11:21:09 AM »
Hi,
I am trying to process with the multicamera system two folder containing thermal images and RGB from XT2 camera. If I ran the process using the original r-jpg and rbg together all seems to work (I have in the photos window the two images coupled one small and one large). Does anyone know what metadata allow the two images to be considered "from the same camera"?
I have wrote a script in R to convert r-jpg into absolute temperature tif raster and edit its metadata in order to have the necessary information (e.g. GPS position) to import the tif in metashape but when I try to process them together with rgb, I can't see them coupled. Any help is really appreciated. Thanks

JoseASanchez

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Re: thermal images multi camera system process
« Reply #1 on: February 15, 2021, 01:38:30 PM »
Hi,

I'm working on the same issue. Any advance?.

Regards

r02mr18

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Re: thermal images multi camera system process
« Reply #2 on: February 26, 2021, 12:36:30 PM »
Hi JoseASanchez,

yep, managed to build an orthomosaic but completely abandoning the two camera approach. Using the calibrated RJPG (now .tiff files), I have stitched them independently by subset them in three different chunks ( I have in tot 800 images). Fore some reason, not completely clear to me, when the images are divided into chunks metashape is able to align them (while processing all the images together fails). The alignment process is complete after iteratively running the alignment several time (as in https://www.agisoft.com/forum/index.php?topic=8554.0 ) and adding GCP for each chunk. I have subsequently aligned the three chunks using GCP (marker). Consider that in the calibrated .tiff  are written, using exiftool, the original metadata of the rJPG about centroid coordinates, altitude and yaw, pitch, roll degree. I guess without these metadata the alignment would fail more likely (but depending on your images resolution..)

Happy to give further details if needed.
Matteo

JoseASanchez

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Re: thermal images multi camera system process
« Reply #3 on: May 07, 2021, 09:32:22 AM »
Hi Matteo,

Thank very much for your clarification. I'm following the same approach using directly RAW data in tiff format extracted from RJPG header. Build the ortho and then, I make the temperature conversion. However, I'm interested in two camera approach and build the multi camera ortho automatically. It is supposed that XT2 is synchronized in the same way as for example ALTUM and metashape works perfectly with it.

Please, someone from metashape could provide support to work with XT2 automatically and build the orto in the same way that altum.

Thanks

madu

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Re: thermal images multi camera system process
« Reply #4 on: May 07, 2021, 04:59:01 PM »
Hi,

in my case using a sensefly Duet-t what works for me is to leave the rgb images in the folder and create a subfolder inside with the thermals.This way agisotf understands that the one outside are the masters and the subfolder the slaves.

On the other hand, could you please share the script to convert the images to .tif with temperature values?

Best regards