Table 1.
Michelson Contrast values for five locations on the bounding contour of the targets for the three lighting and two contrast conditions. See the caption of Fig. 6 for terminology.
| Background | Illumination | Target | Back | Right | Front | Lower Left | Upper Left |
|---|---|---|---|---|---|---|---|
| Black | Far Window | Step Up | 0.83 | 0.30 | 0.75 | 0.35 | 0.85 |
| Step Dn | 0.85 | 0.38 | 0.09 | 0.58 | 0.90 | ||
| Ramp Up | 0.84 | 0.33 | 0.04 | 0.46 | 0.86 | ||
| Ramp Dn | 0.85 | 0.38 | 0.02 | 0.49 | 0.89 | ||
| Flat | 0.85 | 0.36 | 0.01 | 0.48 | 0.88 | ||
| Near Window | Step Up | 0.57 | 0.56 | 0.24 | 0.85 | 0.57 | |
| Step Dn | 0.58 | 0.53 | 0.16 | 0.78 | 0.59 | ||
| Ramp Up | 0.54 | 0.60 | 0.00 | 0.86 | 0.53 | ||
| Ramp Dn | 0.56 | 0.56 | 0.08 | 0.83 | 0.58 | ||
| Flat | 0.55 | 0.59 | 0.03 | 0.85 | 0.56 | ||
| Overhead | Step Up | 0.82 | 0.64 | 0.33 | 0.79 | 0.86 | |
| Step Dn | 0.82 | 0.61 | 0.05 | 0.76 | 0.86 | ||
| Ramp Up | 0.81 | 0.68 | 0.01 | 0.79 | 0.85 | ||
| Ramp Dn | 0.82 | 0.67 | 0.05 | 0.77 | 0.86 | ||
| Flat | 0.81 | 0.67 | 0.02 | 0.78 | 0.86 | ||
| Gray | Far Window | Step Up | 0.26 | 0.28 | 0.71 | 0.41 | 0.24 |
| Step Dn | 0.32 | 0.23 | 0.10 | 0.18 | 0.32 | ||
| Ramp Up | 0.26 | 0.29 | 0.05 | 0.32 | 0.24 | ||
| Ramp Dn | 0.31 | 0.21 | 0.03 | 0.26 | 0.31 | ||
| Flat | 0.30 | 0.25 | 0.01 | 0.30 | 0.29 | ||
| Near Window | Step Up | 0.10 | 0.29 | 0.18 | 0.42 | 0.01 | |
| Step Dn | 0.09 | 0.27 | 0.12 | 0.18 | 0.03 | ||
| Ramp Up | 0.13 | 0.25 | 0.01 | 0.37 | 0.05 | ||
| Ramp Dn | 0.09 | 0.27 | 0.07 | 0.29 | 0.02 | ||
| Flat | 0.11 | 0.27 | 0.04 | 0.34 | 0.03 | ||
| Overhead | Step Up | 0.26 | 0.04 | 0.35 | 0.13 | 0.31 | |
| Step Dn | 0.26 | 0.04 | 0.04 | 0.01 | 0.28 | ||
| Ramp Up | 0.24 | 0.05 | 0.01 | 0.07 | 0.30 | ||
| Ramp Dn | 0.25 | 0.05 | 0.03 | 0.02 | 0.28 | ||
| Flat | 0.24 | 0.05 | 0.02 | 0.04 | 0.29 |