Table 2. Stress standard deviation SD(
) obtained for various degrees of the gray-level interpolation function and sizes of the ZOI (expressed in pixels). Column ‘Opt.’ reports results for a rectangular ZOI whose size is optimized to match the spot spread.
| 10 × 10 | 20 × 20 | 30 × 30 | 40 × 40 | 50 × 50 | Opt. | |
|---|---|---|---|---|---|---|
| Bilinear | 1.43 | 1.65 | 1.49 | 1.46 | 1.55 | 1.38 |
| Bicubic | 12.69 | 13.19 | 13.66 | 14.41 | 17.21 | 14.61 |
| Spline bicubic | 12.77 | 13.26 | 13.84 | 14.12 | 17.37 | 14.79 |
| Biquintic | 1.31 | 1.31 | 1.35 | 1.38 | 2.50 | 1.30 |