Want to extract information from the image

Dear Admin,

I am looking for a labview code for extracting information from an image. Please see the attached image in which temperature is changing from 25 degrees to 150 degrees (see the bar at the top of the image). I want to know the exact temperature at every point of the image. If someone already have labview code, please share it or guide me towards the similar example.

Thanks and Regards

Hassan