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SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio
Contrast Ratio Options 10:1 and 2:1 contrast ratiosUse 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 onlyimproves the compl
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Introduction

Contrast Ratio Options

Paper Type - Semi-gloss or Matte Options

Square Grid Dimension Options

Ink Jet Chart Resolution

This chart, and all our ink jet printed charts have an approximate MTF50 of 5 cycles/mm.  Please keep this in mind when choosing the size of chart.  Using a chart that is too small with a high-resolution sensor can result in the MTF of the chart degrading the measured MTF of the camera system. In addition, it is important to use a chart that is large enough to accomodate the minimum focus distance, as well as the resultion of your sensor. 

Paper Size and Active Area Options

Charts are available in tfive main sizes with variations depending on the grid dimensions selected. It is recommended that the medium sized charts be used to test imaging systems with sensors up to 12 MP, the large charts be used for testing of sensors above 12 MP and up to approximately 24 MP, and the extra-large charts be used for sensor sizes above 24 MP.

Paper Size (Including Margin)

  Square Dimensions
5x9 5x7
X-Small 8.5" × 15" 8.5" × 10"
Small 14" × 24" 14" × 20"
Medium 24" × 40" 24" × 34"
Large 44" × 60" 44" × 60"
X-Large 44" × 74" 44" × 64"

Active Area

The active area of the chart includes white space above and below the top and bottom distortion bars. It is slightly larger than the printed area, which is bounded by the distortion bars on top and bottom. White space is included in active area because test images of the chart must include this white space in order to enable automated processing in SFRplus software.

  Square Dimensions
5x9 5x7
X-Small 7.85" × 15" 6.75" × 10"
Small 12.5" × 24" 13.5" × 20"
Medium 22" × 39.22" 22" × 33"
Large 33" × 59" 40" × 59"
X-Large 42" × 72" 42" × 59"

Color Chart Option

Inclusion of the color chart enables testing of color accuracy. If the color option is selected, the "focus star" pattern that aides in focusing is replaced by a 20 patch color chart.

Pre-Distortion Options

Pre-distorted charts offer the ability to map the outer edges of a wide angle or fisheye lens using SFRplus.  These distortion levels are available

Level Matrix (5x7) Matrix (5x9)
No distortion [0 0] [0 0]
Distort [0.833 1.123] [0.833 1.375]
Distort+ [1.167 1.577] [1.167 1.982]
Ultradistort [1.333  2.313] [1.333 2.958]