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ISO 12233: 2014 Edge SFR (eSFR) chart with extra wedges
Detail information
Video
| Chart Size | Basic | Enhanced | Extended |
|---|---|---|---|
| 1x | 200 mm × 305 mm 7.875" × 12" |
200 mm × 305 mm 7.875" × 12" |
200 mm × 365 mm 7.875" × 14.5" |
| 2x | 400 mm × 610 mm 15.75" × 24" |
400 mm × 610 mm 15.75" × 24" |
400 mm × 730 mm 15.75" × 29" |
| 4x | 800 mm × 1220 mm 31.5" × 48" |
800 mm × 1220 mm 31.5" × 48" |
800 mm × 1460 mm 31.5" × 58" |
Enhanced Version
The Imatest Enhanced ISO 12233:2014 E-SFR chart has all the features of the Standard chart, keeping the 3:2 aspect ratio, with the addition of six added slanted squares for measuring performance near the image boundaries and hyperbolic wedges for visual analysis or analysis with the Imatest Wedge module. It also has 16 color patches when produced with technologies that allow color. Since these additions are in regions of the chart not covered by the standard, compliance with the standard is unaffected.
The differences between the Imatest charts and the chart illustrated in the standard are listed below. Even with these differences the Imatest chart is in full compliance with the standard.
- A 20 patch OECF grayscale pattern* is used as opposed to the 16 patch version.
- The Focus Patterns in the centers of the squares are rectangular (to increase the MTF measurement area) and are designed to reduce interference with automatic edge detection.
- There are four registration marks instead of three to facilitate automated region detection. (Four features are required for a projective transform.)
- An additional mark above the lower-left registration mark is used for detecting chart orientation.
The differences between the Enhanced and Standard Versions are as follows:
- Six extra slanted squares are added for measuring performance near the image boundaries.
- Several hyperbolic wedges with spatial frequencies, similar to the CIPA chart referenced in the ISO standard, for visual analysis or use with the Imatest Wedge module.
- 16 color patches when produced with technologies that allow color (inkjet or color LVT), with colors similar to the industry-standard 24-color test chart.
This chart will work with the fully-automated eSFR ISO module, starting with the Imatest 4.0 release.
Extended Version
The Imatest Extended ISO 12233:2014 E-SFR chart has all the features of the Enhanced chart (six extra squares, wedges, and 16 color patches where possible), but has a 16:9 aspect ratio, which makes it suitable for HDTV and cinema measurements (and it also works well with 3:2 aspect ratio DSLRs). It is fully compliant with the standard.
This chart will work with the fully-automated eSFR ISO module, starting with the Imatest 4.0 release.
Standard Version
This chart, which has a 3:2 aspect ratio, is a "no-frills" implementation of the standard. For most work we recommend the Enhanced or Extended charts, which have additional edges for measuring performance near the image boundaries, as well as hyperbolic wedges and color patches (where the technology allows). These charts maintain full compliance with the standard.
The Imatest Standard ISO 12233:2014 E-SFR chart closely resembles the Low contrast E-SFR test chart illustrated in section 6.1 and Annex C of the ISO standard document, with a few differences, all of which are fully compliant with the ISO standard.
- A 20 patch OECF grayscale pattern* is used instead of the 16 patch version.
- The Focus Patterns in the centers of the squares are rectangular (to increase the MTF measurement area) and are designed to reduce interference with automatic edge detection.
- There are four registration marks instead of three to facilitate automated region detection. (Four features are required for a projective transform.)
- An additional mark above the lower-left registration mark is used for detecting chart orientation.
This chart will work with the fully-automated eSFR ISO module, starting with the Imatest 4.0 release.
*Please Note: When Matte surface is selected, the OECF 14524 chart does not meet the standard for maximum density.
