Mavic 3T - How do I set the thermal camera to take RJPG instead of jpg?

[lidardroneservices]

Hello All,

Quick question, how I set my thermal camera settings to take Rjpg photos instead of jpg. I’ve went into the camera settings, but for a single photo, it will not allow me to select any other option than jpg. Any help is appreciated!

 

[puppyppoi]

Hello All,

Quick question, how I set my thermal camera settings to take Rjpg photos instead of jpg. I’ve went into the camera settings, but for a single photo, it will not allow me to select any other option than jpg. Any help is appreciated!

Did you ever figure this out? I am trying to confirm it will take RJPG before purchasing.

 

[lidardroneservices]

Did you ever figure this out? I am trying to confirm it will take RJPG before purchasing.

Totally forgot abt this post. Yes it takes rjpg photos for all its thermal pics.

 

[JonPak]

Totally forgot abt this post. Yes it takes rjpg photos for all its thermal pics.

How did you set it?

 

[jaja6009]

How did you set it?

You don't have to set it. The JPEG is an R-JPEG.
The file extension will still be JPEG, it will never say RJPEG in your windows details.

 

[Mady]

Hi, mine took JPG picture by default and I could verify this by opening the photos in ArcGIS Pro and see that the raster is only 3 bands (JPG file) instead of 4 bands (R-JPG file).

The Mavic3T manual says that both types of images (JPG and R-JPG) can be taken with the drone. Does anyone know how to take R-JPG pictures? It is essential if you want to do thermal photogrammetry with most software afterwards.

 

[jaja6009]

Hi, mine took JPG picture by default and I could verify this by opening the photos in ArcGIS Pro and see that the raster is only 3 bands (JPG file) instead of 4 bands (R-JPG file).

The Mavic3T manual says that both types of images (JPG and R-JPG) can be taken with the drone. Does anyone know how to take R-JPG pictures? It is essential if you want to do thermal photogrammetry with most software afterwards.

As stated above, there is no setting to change.
The thermal image is a DJI spec RJPEG.
If used in DJI Thermal Analysis Tool it functions as an RJPEG.
It will not work in FLIR Tools.

If you want to do thermal photogrammetry using Pix4D or Agisoft, you will have to use a convertor to make it a TIFF file.

There are paid and free convertors available and they work as I have used one and the result is a radiometric ortho map with temperatures assigned to every pixel. If you use the DJI spec RJPEG in Pix4D or Agisoft without using the convertor, the result will be a non-radiometric orthomap because it was treated as a normal JPEG.

 

[Mady]

As stated above, there is no setting to change.
The thermal image is a DJI spec RJPEG.
If used in DJI Thermal Analysis Tool it functions as an RJPEG.
It will not work in FLIR Tools.

If you want to do thermal photogrammetry using Pix4D or Agisoft, you will have to use a convertor to make it a TIFF file.

There are paid and free convertors available and they work as I have used one and the result is a radiometric ortho map with temperatures assigned to every pixel. If you use the DJI spec RJPEG in Pix4D or Agisoft without using the convertor, the result will be a non-radiometric orthomap because it was treated as a normal JPEG.

Hi, thanks for your reply.


Can you tell me which free tool you used to convert to TIFF?


Also, I did a flight in orthocollection with both RGB and IR camera to eventually create an orthomosaic of IR images. However, each image has a different temperature range because the camera automatically adjusts to present a "nice" result, i.e. nice colors.

Won't this cause problems with pixel matching in software like Pix4D or Agisoft? From my experience it seems like it will, because for the exact same pixel with the same temperature, the colors will be different in the 2+ images where it appears. When I tried to import my jpg in Metashape (only 3 bands, not yet converted to TIFF to have temperature info), all the images were in random places and the pixel matching was terrible.

So my second question is: is there a way to fix the temperature range so that all images from the same flight have the exact same color for the same temperature value?


I've tried going into the thermal camera's settings to either set the range or disable "FFC auto", but it doesn't work (see attached files).

Thanks in advance!

P.S. I'm used with RGB photogrammetry in Pix4Dmapper and Mavic 3E, but I'm very new to thermal imagery.

 

[jaja6009]

Hi, thanks for your reply.


Can you tell me which free tool you used to convert to TIFF?


Also, I did a flight in orthocollection with both RGB and IR camera to eventually create an orthomosaic of IR images. However, each image has a different temperature range because the camera automatically adjusts to present a "nice" result, i.e. nice colors.

Won't this cause problems with pixel matching in software like Pix4D or Agisoft? From my experience it seems like it will, because for the exact same pixel with the same temperature, the colors will be different in the 2+ images where it appears. When I tried to import my jpg in Metashape (only 3 bands, not yet converted to TIFF to have temperature info), all the images were in random places and the pixel matching was terrible.

So my second question is: is there a way to fix the temperature range so that all images from the same flight have the exact same color for the same temperature value?


I've tried going into the thermal camera's settings to either set the range or disable "FFC auto", but it doesn't work (see attached files).

Thanks in advance!

P.S. I'm used with RGB photogrammetry in Pix4Dmapper and Mavic 3E, but I'm very new to thermal imagery.

This thread has the information for the free conversion tool.

M

DJI Thermal Images Processing (converter to .tiff) SOLVED!

Dec 12, 2023

Hi Guys, I want to share my findings, here I made a simple tool with gui that let you convert any type of DJI thermal image into a Tiff image with one band containing temperature in celsius.

I made it using the DJI thermal SDK and python.

It is Hosted on my website and packaged as a self extracting .exe with 7zip,

I needed to package it because it needs part of the Dji sdk as dependency.

just download it, run(extract) where you want, and after extraction open the GUI that is the file called: "DJI Image Processor.exe"




It works with all dji models supported by...

• Miro_Rava
• Replies: 53
• Forum: Editing & Techniques

Your concern on the different colors in each image is correct in a nonradiometric map, but will not apply in a radiometric map. In a radiometric map the software will locate a pixel spatially and then give it a temperature value of the average temperature it appears in each image it resides in. Then the color/pallete scheme will be applied.

In a radiometric map you will have something similar, but it won't be the color per se. It will be the temperature value of everything in each image has a different apparent temperature due to reflections. This effect will be much higher in reflective items and less in items with a high emissivity and will also be influenced by the angle of image collection with oblique images suffering more than nadir. Thermography likes the angle to be less than 30 degrees to help control reflection.

A lot of people when doing true quantitative thermography will use correctly collected images (with adjusted parameters emissivity, TReflec, ambient temp, humidity etc.) to do the true analysis and then use the radiometric orthomap as eye candy for clients or for use for some qualitative analysis.

Example: Here is a trailer with a metal roof with a high reflectivity.

Minimum Temp 2.3 C




Minimum 4.0




Minimum 5.0




Minimum 6.5




Here is an example in something with a high emissivity, the built-up roof

Max Temp - 21.6





Max Temp 21.4




Max Temp 21.4





Max Temp 21.4