Fig.1 shows the original image of size 500×500 pixels, the black squares at the top are of sizes 3,5,9,15,25,35 and 55 pixels respectively. Fig.2 shows the image that was smoothed with square averaging filter mask of size (). Fig.1 Fig.2
A.
3
B.
9
C.
15
D.
35
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【单选题】Some insects ________ the colour of their surroundings to protect themselves. [ ]