Figure 6 Image shrinking — The corner method uses the pixel in the upper left hand corner of the nxn area, the average method uses the average pixel, value and the median method uses the median pixel value.

Input  Image
 1  3   5  7
 9 11  13 15
17 19  21 23
25 27  29 31

Corner Shrinking  Average Shrinking  Median Shrinking
     1  5              6 10                3  7
    17 21             22 26               19 23