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Sineimage SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio Transparent

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.
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Date:2019-08-14  Browse:
  • Introduction
  • Product Software

Sineimage SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio Transparent


Model SFRplus
Type Transparent
Format Custom Designs
Contrast Ratios 10:1 & 2:1

Sineimage SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio Transparent

Contrast Ratio Options

 

  • * 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 
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  • * 10:1 contrast only improves the completeness of 3D maps of performance across the imaging surface.
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  • * 4:1 contrast ratio matches the upcoming new ISO-12233 specs.  Click here for our 4:1 contrast ratio SFRplus test charts
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Paper Type - Semi-gloss or Matte Options

 

  • * Matte paper can be easier to light because it has less specular reflection than the semi-gloss paper.  The MTF is slightly less than semi-gloss paper and does not have as deep dark tones on the stepchart.
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  • * Semi-gloss paper has slightly higher detail than matte, has deeper black tones on the stepchart, and is recommended for most applications except for wide-angle lenses.

 

Square Grid Dimension Options

 

  • 5x9 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.
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  • 5x7 grid dimension  is recommended for typical compact camera formats with aspect ratios of 4:3.

 

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]
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