SFRplus

The SFRplus test chart can be used with the SFRplus module in Imatest 3.2 or later to measure MTF, lateral chromatic aberration, distortion, tonal response, and color accuracy. The SFRplus module features fully automated region-of-interest detection. The SFRplus chart offers significant advantages over commonly used charts such as the ISO 12233 chart, including:

1. Much less wasted area

2. The ability to produce a map of sharpness over the sensor surface

3. Better measurement accuracy due to the lower contrast

4. Full support for automated testing

Description

imatest

SFRplus Test Charts
Exceed image quality standards

Imatest charts, designed by a team of experts, were specifically developed to work seamlessly with Imatest Master, Imatest Studio and Imatest IT. Imatest test charts are the most powerful charts available for imaging system development and quality verification

Less wasted area

SFRplus charts make use of the entire chart space, while only about 10% of the standard ISO chart area provides useful information for computerized analysis.

Reduced clipping of high-contrast edges

Making SFRplus test charts more accurate and consistent and less affected by overexposure and underexposure.

More signal processing information

Allowing measurement of the effects of signal processing, such as sharpening and noise reduction that you would not be able to collect with an ISO chart.

Automated Region Detection

Automatically identify regions of interest without manual input.

Variety of sizes and substrates

From 5 x 5 cm to 110 x 187 cm, printed on Matte, Semigloss, or Backlit Media (DisplayTrans) or Photographically Printed Charts on paper or film and even chrome on glass targets for the highest precision needs.

SFRplus tests for:

  • Noise
  • ISO Sensitivity
  • Color Accuracy
  • Texture Response
  • Distortion and Geometry
  • Resolution and Sharpness
  • Gamma and Tonal Accuracy
  • Distortion and Geometry
  • Lateral Chromatic Aberration

Anatomy of the SFRplus Test Chart

Options

Substract

This chart is available with a matte or semi-gloss finish.

Sizing

Paper Size

Square Dimensions
5×95×7
X-Small8.5″ × 15″8.5″ × 10″
Small14″ × 24″14″ × 20″
Medium24″ × 40″24″ × 34″
Large44″ × 60″44″ × 60″
X-Large44″ × 74″44″ × 64″

Active Area

Square Dimensions
5×95×7
X-Small7.85″ × 15″6.75″ × 10″
Small12.5″ × 24″13.5″ × 20″
Medium22″ × 39.22″22″ × 33″
Large33″ × 59″40″ × 59″
X-Large42″ × 72″42″ × 59″

Contrast Ratios

  • 4:1 contrast ratio matches the upcoming new ISO-12233 specs.
  • 10:1 and 2:1 contrast ratios Use of both contrast levels improves ability to analyze non-linear signal processing, which may not affect the lower contrast 2:1 contrast ratio regions
  • 10:1 contrast only improves the completeness of 3D maps of performance across the imaging surface.

Square Grid Dimensions Options

  • 5×9 grid dimension is recommended for for typical DSLR formats with aspect ratios of 3:2 and typical HDTV formats with aspect ratios of 16:9.
  • 5×7 grid dimension is recommended for typical compact camera formats with aspect ratios of 4:3.
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