(6) Determine the name and function of the mask shown in Figure 4. [2 marks] -1 0 +1 -2 0 +2 -1 0 +1 Figure 4: An example of 3x3 mask (d) The equation of the 2-dimensional frequency domain filter is given below. D2(u,v) H(u, v) = 1- 2D i. Determine the function of the 2-dimensional frequency domain filter given above. [2 marks] ii. Analyse and sketch the 1-dimensional filter function, H(u) against u. [3 marks) (e) Propose image processing steps to locate the hot spot from thermal images.[3 marks]