True 4D Image Denoising on the GPU

Table 3

Processing times for filtering with the 14 monomial filters of size 7×7×7×7 and calculating the 4D tensor for the different implementations. The processing times for the GPU do not include the time it takes to transfer the data to and from the GPU.

Data size	Spatial filtering CPU	Spatial filtering GPU	GPU speedup	FFT filtering CPU	FFT filtering GPU	GPU speedup
128×128×111×20	17.3 min	5.7 s	182	25 s	1.8 s	13.9
256×256×223×20	2.3 h	36.0 s	230	3.3 min	14.3 s	13.9