Temperature from Thermal Image

[Siddhant Aphale]

Hello,

I am a beginner in the field of thermal imaging and image processing. I was trying to use the NoIR camera of a Raspberry Pi to perform optical thermometry.

However, it was not a success due to the obvious limitations of the cheap camera hardware. Now I am trying to study the Lepton camera unit along with a Raspberry Pi.

I tried to capture images using the codes provided on Github (https://github.com/groupgets/LeptonModule). 

When I capture an image using the "raspberrypi_capture", I am able to obtain the grayscale image and the terminal window gives me Min Value and Max Value. However, being a novice I am not really sure what these values mean.

Can anyone help me with interpreting these values and how I can get them to predict the temperature? Or direct me to some tutorial where I can learn about these values?

I have also tried using the "raspberrypi_qt" option available and click a snapshot which provides me a color image along with a "raw.bin" file. I am not sure how to interpret this "raw.bin" file or the data from the image to find out the temperature.

Any help in this field will be appreciated.

My ultimate goal is to find out the temperature of the image I am capturing.

Regards,

Siddhant Aphale

[Ben Kluwe]

Hi Siddhant, Welcome to the group. If you want to understand what is going on inside the raw.bin file it is probably best you look directly into the code (something that is encouraged anyway).

Mapping the raw values to temperatures has been discussed in some other threads already, you can start by looking through this topic: https://groups.google.com/forum/#!topic/flir-lepton/ZhXGJvLWSiI

Best Regards,
Ben Kluwe

[Siddhant Aphale]

Hello Ben,

Thank you for your response. I will start looking through the thread you provided.