DJI Mavic 2 Enterprise Dual FLIR Camera - Page 1
Forum section: electronics / general

author: primelf
author_rank: Newbie
timestamp: June 16, 2019, 04:39:30 pm
content: Hello,I am using a DJI Mavic 2 Enterprise Dual for thermal imagery. Although it has a FLIR thermal camera, it doesnotsave these images in a format that has radiometric metadata. I need these images to be able to calculate the temperature of a specific pixel. The best resources I have found are here:http://u88.n24.queensu.ca/exiftool/forum/index.php/topic,4898.msg23972.html#msg23972But this information doesn't necessarily help me. I am unsure if this camera uses the same constants and such as the ones referenced in the post, and since I cannot get the data from the camera I am unsure of what to do inorder to obtain the necessary information.If anyone has worked with this drone/camera before I would really appreciate some guidance on how I can get this information, and even better would be if someone can help clarify exactly which formula I would want to use.- primelf

author: primelf
author_rank: Newbie
timestamp: June 16, 2019, 04:43:04 pm
content: As a side note to this question, can anyone tell me if FLIR uses linear mapping for their temperature to color conversions? If I set the range of my images to be from -20C - 20C can I just map these temperatures and colors using the formula f(x, y, z) = (((|z-y|)/255)*x)+y; where x is color, y is the min temperature, and z is the max temperature?

author: railrun
author_rank: Regular Contributor
timestamp: June 16, 2019, 04:46:04 pm
content: Can you upload a example image? Thanks

author: primelf
author_rank: Newbie
timestamp: June 16, 2019, 05:06:09 pm
content: Some reason it's not letting me upload the photos. It just redirects me to a new topic.https://drive.google.com/file/d/1Tv_3nZG9WzpGNUjpbr0Iaym3VO4hTLhc/view?usp=sharingI have uploaded a few of the images and their respective RGB counterparts to Google Drive here.

author: railrun
author_rank: Regular Contributor
timestamp: June 16, 2019, 06:39:28 pm
content: Strange. This files you copied from the SD card or via the DJI App?In picture DJI_0304 are 2 pictures, both are identical.The files is separeted in 3 parts:1. Image2. x-packet3. Image (like 1.)Can you check in the app, if you can change the "photo format"? I only own a Flir Vue Pro and there you can switch between jpeg, radiometric jpeg and 14bit tiff.

author: primelf
author_rank: Newbie
timestamp: June 16, 2019, 08:38:31 pm
content: Quote from: railrun on June 16, 2019, 06:39:28 pmThose photos are directly from the SD Card.I actually got in touch with FLIR support about the issue and they said "The Mavic 2 Enterprise Dual does not save images in radiometric JPEG which is required in order to save and manipulate the temperature data of each pixel."I also don't believe it is possible to change the photo format in the app. I haven't seen the option when exploring around. What do you mean by the x-packet? I've not heard of that term before.

author: Chanc3
author_rank: Frequent Contributor
timestamp: June 24, 2019, 09:42:06 pm
content: I've been nagging DJI about this for some time. They spoke with us prior to the launch of the M2ED, mentioned the size, thermal capabilities, sounded great! Then they said it was a lepton... wtf.That aside DJI have a habit of wanting to do things themselves, so wouldn't use FLIRs SDK for it. I do believe they are releasing an update to enable radiometric image capture however.

author: Hyper_Spectral
author_rank: Regular Contributor
timestamp: July 17, 2019, 06:17:17 pm
content: As far as I know, there is no radiometric version of the Mavic 2's IR camera. You need a Tau 2 core.You can't just software unlock radiometric functionality...

author: Chanc3
author_rank: Frequent Contributor
timestamp: July 23, 2019, 12:45:34 pm
content: Quote from: Hyper_Spectral on July 17, 2019, 06:17:17 pmIt is using the radiometric FLIR Lepton gen3 core, so it can be unlocked via a software upgrade in this case.The reason why it is not currently radiometric, is that DJI opted to build their own firmware for it, rather that utilise FLIR's SDK (like what Parrot did). Consequently, no radiometry yet!