How to plot multiple images on the same graph using FigurecanvasTkAgg

Dear all,
I wanted to reciprocate the effect of :
 import matplotlib.pyplot as plt}
 plt.imshow(image1)
 plt.pause(0.7)
 plt.imshow(image2)
in a code making use of Tkinter and FigureCanvastkAgg;
Which lookes something like this :
f = Figure(figsize=(6,6))
 a = f.add_subplot(111)
 image = np.array(np.random.random((1024,1024))*100,dtype=int)
 a.imshow(image)
 canvas = FigureCanvasTkAgg(f, self)
 canvas.show()
 canvas.get_tk_widget().pack(side=tk.BOTTOM, fill=tk.BOTH, expand=True)`
If I want to plot another image2 in the same graph. How could I do it?
I tried another method but was not able to obtain the desired output:
> ​
>
 self.i = 0
 def Plot():
 print self.i
 self.f = Figure(figsize=(6,6))
 self.a = self.f.add_subplot(111)
 image = np.array(np.random.random((1024,1024))*100,dtype=int)
>
> if self.i <20:
 self.i = self.i+1
 self.a.imshow(image)
 self.canvas = FigureCanvasTkAgg(self.f, self)
 self.canvas.show()
 self.parent.after(500,Plot)
 Plot()
>
>
 self.canvas.get_tk_widget().pack(side=tk.BOTTOM, fill=tk.BOTH,
> expand=True)
 toolbar = NavigationToolbar2TkAgg(self.canvas, self)
 toolbar.update()
 self.canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=True)
​
>
>
Awaiting your reply.
-- 
Regards,
Aishwarya Selvaraj