iso12233:2017eSFR Enhanced meets the requirements of the standard

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.

• 1. A 20-patch OECF grayscale pattern* is used as opposed to the 16-patch version.
• 2. 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.
• 3. There are four registration marks instead of three to facilitate automated region detection. (Four features are required for a projective transform.)
• 4. 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:

• 1. Six extra slanted squares are added for measuring performance near the image boundaries.
• 2. 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.
• 3. 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.

Product Parameter：

Parameter	ISO 12233:2017 eSFR Enhanced
Model	CS-TC088
Size	ISO Size	Enhanced	Extended	Megapixel Suitability
	1X	319.2mm x 212.8mm （12.6 ″ x 8.4 ″）	382.9mm x 215.3mm （15.1 ″ x 8.5 ″）	1.6MP
	2X	638.3mm x 425.5mm （25.1 ″ x 16.8 ″）	765.4mm x 430.05mm （30.1 ″ x 16.9 ″）	6.2MP
	4X	1276.6mm x 851.1mm （50.3 ″ x 33.5 ″）	1513 mm x 850.8 mm （59.6 ″ x 33.5 ″）	24.9MP
Chart Type	Reflective / Transmissive
Spectrum	Visible / Visible & Near Infrared
Relevant standards	ISO 12233：2017

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