Brand Name : 3NH brand
Model Number : SFRplus test charts
Certification : CE/ISO9001/ROHS
Place of Origin : shenzhen
MOQ : 1 set
Price : USD
Payment Terms : T/T
Supply Ability : 1000/months
Delivery Time : 2 working days
Packaging Details : Carton package
Brand : 3nh / Sineimage
Model : E-SFR test charts
Type : Reflective/Transparent
Format : Custom Designs
Ratio : 3:2/16:9
Model | SFRplus |
Type | Transparent |
Format | Custom Designs |
Contrast Ratios | 4:1 |
This SFRplus test chart, and all our ink jet printed charts have an approximate MTF50 of 5 cycles/mm. For a comparison of rflective surfaces, as well as what this means when choosing your chart, please visit our Reflective Surface Comparison Blog. 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.
Charts are available in five 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" |
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-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 |
---|---|
No distortion | [1 1] |
Distort | [0.833 1.123] |
Distort+ | [1.167 1.577] |
Ultradistort | [1.167 1.982] |
This chart, which has a 3:2 aspect ratio, is a "no-frills" implementation of the standard. For most work we recommend the Enhanced or Extended charts, which have additional edges for measuring performance near the image boundaries, as well as hyperbolic wedges and color patches (where the technology allows). These chartsmaintain full compliance with the standard.
The Imatest Standard ISO 12233:2014 E-SFR chart closely resembles the Low contrast E-SFR test chart illustrated in section 6.1 and Annex C of the ISO standard document, with a few differences, all of which are fully compliant with the ISO standard.
The Imatest Enhanced ISO 12233:2014 E-SFR chart has all the features of the Standard chart, keeping the 3:2 aspect ratio, with the addition of six added slanted squaresfor measuring performance near the image boundaries and hyperbolic wedges for visual analysis or analysis with the Imatest Wedge 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 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.
The differences between the Enhanced and Standard Versions are as follows:
This chart will work with the fully-automated eSFR ISO module.
The values of the 11-graduated gray scale are as follows:
Step | Density | Reflectance in % |
1 | 0.05 | 89 |
2 | 0.13 | 74 |
3 | 0.22 | 60 |
4 | 0.32 | 48 |
5 | 0.43 | 37 |
6 | 0.55 | 28 |
7 | 0.69 | 20 |
8 | 0.88 | 13 |
9 | 1.06 | 8 |
10 | 1.31 | 5 |
11 | 1.65 | 2 |
The density values are based on BaSo4 = 0. Two black fields and a white field are located between the gray scales, the density of the black filed is D > 2.4 (reflectance < 0.5 %). The density of the white filed is D = 0.05 (reflectance = 89.9 %).
Sineimage SFRplus Chart: Inkjet on Paper - 4:1 Contrast Ratio Transparent for MTF, distortion, tonal response, and color Images |