DFT and noise

DFT and noise

by Kristian Lindholm -
Number of replies: 1

In the question below I'm a bit confused about the answer.


I'm just wondering about the way to think about the answer, given that the "The discrete Fourier transform can be used" is marked as correct. To me it seems that using the DFT on an image does not remove high frequencies in itself, but truncating the frequency domain will. According to the slide below.


The question is now, when seeing a question like this, where the answer is part of a solution, will it always be considered correct, even though it is not the entire answer to the problem. Or am I completely lost?

- Kristian

In reply to Kristian Lindholm

Re: DFT and noise

by Andrey Davydov -
This is true that you can use DFT to remove high frequencies from an image. This is a valid answer, as the context implies DFT followed by some denoising steps. I guess, you would agree that if the answer had contained all technical details, then it would be too easy to establish whether it is correct.
I would recommend to ask yourself "is it wrong that DFT can be used?" In this case, it is evident that it is not false, hence true.