The Fourier transform is defined not only for 1D signals but for functions of arbitrary dimension. Thus, 2D images are nothing special from a mathematical point of view.
CITATION STYLE
Burger, W., & Burge, M. J. (2016). The Discrete Fourier Transform in 2D (pp. 481–501). https://doi.org/10.1007/978-1-4471-6684-9_19
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