USFFTUnequally--spaced Fast Fourier Transform
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There are two different digital implementations of Fast Digital Curvelet Transform (FDCT), which are based on Unequally Spaced Fast Fourier Transform (USFFT) and Wrapping Transform, respectively.
Candes et al (2005) proposed two new forms of curvelet transform based on different operations of Fourier samples, namely, Unequally-Spaced Fast Fourier Transform (USFFT) and wrapping based fast curvelet transform.