Table 2.

Reconstruction times in fps for various image sizes with side length N and fixed versus variable oversampling ratio γ. For some input sizes, 1.5 is the optimal value (N = 128, N = 144); for other sizes, the number of grid sample locations must be increased to yield a speed-up (N = 160, N = 170). For a third group of image sizes (N = 256), the optimal FFT size increases the size of the data to a degree that the speed-up is reduced or even nullified by additional overhead. For each test case, 200 frames were reconstructed using 1 accelerator.

N	Fixed γ = 1.5		Optimal γ ≥ 1.4			S
	G	fps	γ	G	fps
128	384	8.1	1.5	384	8.3	1.02
144	432	2.5	1.5	432	2.5	1.00
160	480	4.4	1.51875	486	5.0	1.25
170	510	2.5	1.50588	512	5.8	2.32
256	768	2.4	1.53125	784	2.4	1.00