I have a FLIR Vue Pro with which I have taken TIFF images of 16-bit data. FLIR tools is not recognizing these TIFF files. However, FLIR tools is recognizing JPEG 8-bit data. I converted TIFF image to JPEG 16-bit data but there is no use as FLIR tools is not recognizing this JPEG as well. May I know is there any way to extract temperature from TIFF image?
Sorry My bad. The camera take pictures in JPEG 8bit format and the software reads it. I am able to see the temperature as well. But the precision is not sufficient for me. Hence I am trying to use the raw data (16-bit TIFF data) which the camera stores in its memory (in this case an SD card) to avail more precision. This raw data does not work with the software provided.
BTW, I did a small research over that and got to know the 16-bit TIFF converted to 16-bit JPEG data with RGB bands, the software is able to recognise. However the header information is not transferred properly. (I am using EXIF tool to copy the header info from TIFF to JPEG). On further research, I have come across certain article stating that FLIR logo is embedded which EXIF tool cannot identify. If that kind of encryption is done explicitly, may be the software tool might work well.
Any inputs?
Thanks
Sundara
I also have a FLIR Vue Pro with some TIFF images recorded from a test flight. Did you manage to extract the temperature values from the raw TIFF files? At the moment I can only see the raw digital number values. Is it possible to see the temperature when using the jpg files?
FOUND IT - https://support.pix4d.com/hc/en-us/articles/208592186-Thermal-projects-FAQ#gsc.tab=0
How to get the coefficient of Tiff format? or is the coefficient variable?
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Where can I see the temperature?
To obtain temperatures, a sensor that is able to provide absolute temperature is needed (instead of relative temperature). The FLIR Vue Pro and the Zenmuse XT do not provide absolute temperature. However, the FLIR Vue Pro and the Zenmuse XT both have a radiometric version that does record absolute temperature. It is recommended to do the processing with the uncompressed Tiff images and create the following index to view absolute temperature
0.04*thermal_ir - 273.15
This also applies (with the same formula) to the newer Wiris camera.
The Thermomap camera from senseFly also records absolute temperature. The corresponding index is
0.01*thermal_ir - 100
This index is already present in the software and is loaded automatically for Thermomap projects.
Jon - thanks for the link! But I think that is only for the FLIR Vue Pro R. I will try it with our FLIR Vue Pro to see if it happens to work as well
I found a method to build the function.
1. Use exiftool software (Ubuntu) to get the meta of TIFF or JPG data.
exiftool DJI_0777.tif
2. Find "Central Temperature".
exiftool DJI_0777.tif|grep "Central Temperature"
3. Get the Min/Max Digital Values of TIFF or JPG data from ARCGIS or QGIS.
4. Central temperature is the min temperature in my data through the analysis of FLIR Tools, PLEASE NOTICE, this may be different.
5. Build a linear equation between Digital Values and Central Temperature.
6. Get temperature from TIFF or JPG format data through the equation.
7. And then, we can do anything, such as simple operation and modeling using Matlab, R, Python ...
Thanks!
Hi Julia Kelly, Were you able to extract absolute temperature with the index given in the link?
Hi Sundara!
You can find information on how to extract temperature from satellite imagery using the thermal band here: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.140.5218&rep=rep1&type=pdf
Information on how to convert a TIFF image to jpg (8-bit) using open-source software can be found here: https://gis.stackexchange.com/questions/143584/convert-a-tiff-float32-image-to-8bit-tif-or-jpeg-image-using-gdal-and-python
Information on how to convert a TIFF image to jpg (8-bit) using the commercial FME software can be found here: https://www.safe.com/convert/geotiff/jpeg/
Hope this is helpful...
Good luck!
Best regards,
Karolina
Hi Lihui Luo , Thank you for the answer. Infact we were working in the similar manner. However, I could not get a valid exiftool my_image.tiff|grep "Central Temperature" because that attribute does not exit in the metadata. Whereas I found "central wavelength". How do we get central temperature for FLIR Vue Pro?
Hi Sundara!
I am considering buying the FLIR Vue Pro. But I want to make sure I can extract the temperature matrix first. So can you send me one image (with all different formats available) to see if I can extract the temperature.
Dear colleagues,
Lihui Luo, I have found the Center Temperature in my tiff image, will it be related to the emissivity coefficients used in the image/video acquisition?
Sundara Bharathi Dhamotharan, were you able to find the values in your metadata? Maybe you can use this command:
".\exiftool.exe -a -u -g1 image.tif"
or use another tool, the exiv2 (https://www.exiv2.org/)
This discussion helped me, if you are still working with it I hope we can discuss more.
Kind regards
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