Imaging swiFTly: Streaming widefield Fourier Transforms for large-scale interferometry

Open Access

Fig. 4

2D algorithm sketch of both transformation directions, highlighting the symmetry. This also illustrates buffer sizes, showing how padding facet data to 4u_Υl_n tends to dominate memory consumption both in the horizontal (u) and vertical (υ) axes. This is why it is important to share intermediate buffers for subgrids from the same ‘column’ $(m_{i}^{(u)} = m_{i^{'}}^{(u)})$ $\[\left(\mathrm{m}_i^{(\mathrm{u})}=\mathrm{m}_{i^{\prime}}^{(\mathrm{u})}\right)\]$ .

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