18. Given the following image, apply a Robert's edge detector, absolute value format, to the image (do not worry about the top row and leftmost column). Next, threshold the image with the following values and find Pratt's Figure of Merit for the found edge points. Let a = 0.5, and use the chessboard distance measure. Threshold val- ues: (a) 5, (b) 12, and (c) 22. teoq orie [0 20 m 0 hivOns 01eqxa bo090 of 0 0 0 0 sterilen 0 0 Forli, 10 0 pra (con 0 0 000 bog dol 9251091 10 10 0 0 0