ISO 12233 Edge SFR (eSFR) Inkjet chart

Description

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* As measured to the outside of the black border. 

 The Enhanced and Extended Versions are also available with Extra Wedges. For higher megapixel versions of this target: click here.

2023 Extended Version

The Imatest Extended ISO 12233:2023 eSFR chart is based on the latest revision of the ISO 12233 standard, along with six extra slanted stars, and 18 color patches. It 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 23.2 release.

• A 20-patch OECF grayscale pattern
• 18 color patches with colors similar to the industry-standard 24 patch (18 color patches) test chart.
• Logarithmic wedges with spatial frequencies, similar to the CIPA chart referenced in the ISO standard, for visual analysis or use with the Imatest Wedge module.
• 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.

2017 Enhanced Version

The Imatest Enhanced ISO 12233:2017 eSFR 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 eSFR ISO 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 Enhanced Version is also available with Extra Wedges. Maximum Wedge Frequency of 4000 LW/PH is better for higher resolution camera, but it is only available with the 4x size chart.

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.

2017 Extended Version

The Imatest Extended ISO 12233:2017 eSFR 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. The Extended Version is also available with Extra Wedges.

This chart will work with the fully-automated eSFR ISO module, starting with the Imatest 4.0 release.

Chart Mounting and Magnetic Backing

It is strongly recommended that charts be mounted on a smooth, flat surface, like an acrylic board, to ensure no blemishes, bends, or bubbles occur that negatively impact image quality measurements. Imatest offers the option to professionally mount our test charts on acrylic or E-panel. A magnetic backing can be added to the chart to easily attach it to the Imatest Modular Test Stand or Benchtop Test Stand.   You can select the chart mounting options from the chart mounting dropdown.   

For more details, see our chart mounting solutions page.

Documentation and software support

SFRplus can be run either through the highly-interactive Rescharts interface or as a batch-capable fixed module. The key documentation for getting started is Using SFRplus Part 1, found in the SFRplus section of the Documentation page. We recommend framing the chart with a small amount of white space above and below the top and bottom bars. Badly-framed charts can be analyzed with SFR using manual ROI selection.