GPU Pro 5

484 VI Compute

Megapixels/Second

0

2000

4000

6000

8000

10000

12000

24681012141618

Filter Size

Texture

Shared

Shared unrolled

FFT

Texture unrolled

Figure 5.6. Performance, measured in megapixels per second, for the different imple-

mentations of 2D filtering, for an image of size 2048 × 2048 and filter sizes ranging from

3 × 3to17× 17. The processing time for FFT-based filtering is independent of the filter

size and is the fastest approach for non-separable filters larger than 17 × 17.

5.9.2 Performance, 3D Filtering

Performance estimates for non-separable 3D filtering are given in Figures 5.8–

5.9. Again, time for transferring the data to and from the GPU is not included. ...