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Imatest
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.
Detail information
Key features of the Imatest Spilled Coins Cross chart:
- The Spilled Coins colored (Random Cross) pattern in the central region is almost perfectly scale-invariant (unlike conventional dead leaves charts), allowing it to be used for reliable MTF measurements.
- Maximum contrast range is 4:1 with 18% gray background as per the CPIQ new standards.
- It is more uniform, i.e., is more shift-invariant than other Dead Leaves charts.
- It contains slanted edges (2:1 and 4:1 contrast) for convenient comparisons with the Spilled Coins pattern.
- Noise removal: The Noise removal calculations are based on subtracting cross Power Spectral Density (PSD) of reference image(Ground truth) to the Observed/Test image PSD of the active spilled coins area.
- 8 Registration marks are placed around the active area and those are used to transform the reference image to match with the Observed/Test image to find the MTF.
- 16 grayscale patches are included. The linear levels used to create the grayscale patches are 0 through 255 in steps of 17 (same as the Siemens Star chart in the draft of the upcoming ISO 12233 standard). The black outline makes it easy to align the chart.
|
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 |
24" × 18" 610 mm × 458 mm |
| Medium | 8" × 8" 203 mm × 203 mm |
14.93" × 11.2" 379 mm × 284 mm |
16" × 12" 458 mm × 305 mm |
| Small | 6" × 6" 152 mm × 152 mm |
11.2" × 8.4" 284 mm × 213 mm |
12" × 10" 305 mm × 254 mm |
Read more about Random/Dead Leaves Cross chart analysis.
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