In frequency domain terminology, which of the following is defined as obtaining a highpass filtered image by subtracting from the given image a lowpass filtered version of itself ?

In frequency domain terminology, which of the following is defined as

1.	In frequency domain terminology, which of the following is defined as obtaining a highpass filtered image by subtracting from the given image a lowpass filtered version of itself ?
A.	tEmphasis filtering
B.	tUnsharp masking
C.	tButterworth filtering
D.	tNone of the mentioned
Answer» C. tButterworth filtering

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In frequency domain terminology, which of the following is defined as obtaining a highpass filtered image by subtracting from the given image a lowpass filtered version of itself ?

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