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How to do dealiasing in 2D?

  1. Dec 15, 2015 #1

    I would like to use the 2/3 padding rule for the dealiasing. In 1D, it's straightforward. For 2D, do I just have to set the highest 1/3 frequency components zero in both directions? For example, I ffted a 7*7 real data in Matlab, then I set the 4th and 5th columns and rows (corresponding to the highest 1/3 frequencies) to be zero. Is this ready for doing dealiasing? Thanks.
  2. jcsd
  3. Dec 15, 2015 #2


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    Science Advisor

    If you FFT real data, then half of your resulting spectrum is redundant and can be ignored. I wouldn't set it to zero. Just ignore it.
    If you are using zero padding, then you can zero pad in both directions. 7*7 seems awfully small for frequency analysis, but I guess it can be done.
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