Various types of software has been developed for calculation of thermal contrast from Infrared Detectors. Some of the most popular includes: FLIR ResearchIR, Thermoviewer, ThermoFit Pro, ThermoCalc-3D etc. The other simple way could be the application of MATLAB with Infrared detectors. You need to perform basic image processing tasks with MATLAB.
Thanks for the answering, are the methods you suggested me used for real time thermal contrast measurements or just for finite element simulation kind things?