What is the name of the filter that is used to turn the average value of a processed image zero?(a) Unsharp mask filter(b) Notch filter(c) Zero-phase-shift-filter(d) None of the mentionedI got this question in an interview for job.My doubt is from Filtering in Frequency Domain in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

What is the name of the filter that is used to turn the average value

1.	What is the name of the filter that is used to turn the average value of a processed image zero?(a) Unsharp mask filter(b) Notch filter(c) Zero-phase-shift-filter(d) None of the mentionedI got this question in an interview for job.My doubt is from Filtering in Frequency Domain in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing
Answer» The correct answer is (b) NOTCH FILTER Best EXPLANATION: Notch filter sets F (0, 0), to zero, hence setting up the average value of image zero. The filter is named so, because it is a constant function with a notch at origin and so is able to SET F (0, 0) to zero leaving out other values.

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