Give a 3 × 3 mask for performing unsharp masking in a single pass through an image. Assume...

Give a 3 × 3 mask for performing unsharp masking in a single pass through an image. Assume that the average image is obtained using the filter in Fig. 3.32(a).

FIGURE 3.32 Two 3 ×3 smoothing (averaging) filter masks.The constant multiplier in front of each mask is equal to 1 divided by the sum of the values of its coefficients, as is required to compute an average.