High-Frequency Emphasis Filtering.High-pass filers zero out the DC term (the value at the center of a high-pass filter mentioned in our lecture is 0 in the frequency domain), thus reducing the average value of an image to 0. Then we introduce an approach used to compensate for this is to add an offset to a high-pass filter.

High-Frequency Emphasis Filtering\ButterworthFilter.m
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High-Frequency Emphasis Filtering

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