High pass filters
To enhance the high frequency components in an image, a standard high pass filter is
used. The applied filter is a 3x3 edge enhancement filter with a central value of 16,
eight surrounding values of -1 and a gain of 0.125.
Low pass filters
To remove the high frequency components in an image, a standard low pass smoothing
filter is used. In this activity a 3x3 average filter is going to be used.