Plot temperature of an exact point of a thermal video using a timer

Hello,

I am trying to plot the temperature of an exact point over the time using the thermal camera Optris PI 400. To connect the thermal camera to matlab I use this code:

clear all; 

% initialize the interface
IRInterface = EvoIRMatlabInterface; 

% check for connection error
if ~IRInterface.connect()                   
    return
end
emissivity=0.95;
Tback=22;

    % grab image data
    RGB = IRInterface.get_palette();        % grab palette image
    THM = IRInterface.get_thermal();        % grab thermal image
    Temp = (double(THM)-1000)/10;
    Temp=((Temp.^4-(1-emissivity)*Tback^4)/emissivity).^(1/4);
    Temp=round(Temp);
    % process data here...
    

I get the matrix "Temp" that contains the temperature of every single pixel of one frame of the thermal camera. Using Matlab "ginput" function, I can choose the exact pixel I want with my mouse pointer. My next step is to create a function that uses timers to plot the temperature of the choosen pixel over the time. I want to create a function that once I activate a pushbutton in my GUI, gets a frame of the thermal camera every 0,1 seconds, takes the temperature of a specific pixel of that frame and plots it in a graph during a spcified time (for example 2 seconds). I think I need to use a timer for that but I don't know how to do it. Any help will be very welcome, thanks in advance,

Jok.