Use a Butterworth highpass filter to construct a homomorphic filter that has the same gene...

Use a Butterworth highpass filter to construct a homomorphic filter that has the same general shape as the filter in Fig. 4.61.

FIGURE 4.61

Radial cross section of a circularly symmetric homomorphic filter function. The vertical axis is at the center of the frequency rectangle and D (u, v)is the distance from the center.