Spilled Coins Cross Test Chart
The updated Imatest Spilled Coins Cross test charts use cross-correlation calculation texture metrics to provide improved stability for images with nonlinear noise reduction. Users can now more accurately differentiate between noise and texture. Random/Dead Leaves Cross, which runs under the interactive Rescharts interface, measures SFR (Spatial Frequency Response) or MTF (Modulation Transfer Function) from random scale-invariant (or approximately scale-invariant) test charts, including “Dead Leaves” and “Spilled Coins” charts.
Details
Key features of the Imatest Spilled Coins Cross chart:
- Contrast of the pattern reflectance range is 3:1, with 18% gray background as per the CPIQ new standards.
- 8 Registration marks are placed around the active area to attain a more accurate transformation between the reference image and the test image.
- 16 grayscale OECF patches are included for linearization prior to texture response calculation.
- The chart contains slanted edges (2:1 and 4:1 contrast) for convenient comparisons between Texture MTF and slanted-edge MTF.
- Backwards Compatibility: The chart maintains flat areas of the same mean reflectance as the pattern on either side of the center area, used for Noise Power Spectral Density estimation in the classic “Direct” Texture MTF method supported by our other charts.
- Pattern design is more uniform, i.e., is more shift-invariant than other vendors’ Dead Leaves charts.
| Spilled Coins Cross
chart sizes |
Spilled Coins region | Printed region | Media size total |
|---|---|---|---|
| Large | 12″ × 12″ 305 mm × 305 mm |
22.4″ × 16.8″ 569 mm × 426 mm |
22.9″ × 17.3″ 582 mm × 439 mm |
| Medium | 8″ × 8″ 203 mm × 203 mm |
14.93″ × 11.2″ 379 mm × 284 mm |
15.43″ × 11.7″ 392 mm × 297 mm |
| Small | 6″ × 6″ 152 mm × 152 mm |
11.2″ × 8.4″ 284 mm × 213 mm |
11.7″ × 8.9″ 297 mm × 226 mm |
Read more about Random/Dead Leaves Cross chart analysis.
