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| [[File:1951usaf test target.jpg|thumb|200px|right|Glass chart]]
| | Hello friend. Allow me introduce myself. I am Ron but I don't like when people use my complete name. Managing people is how she tends to make money and she will not alter it whenever quickly. Some time ago he selected to live in Idaho. To play handball is the thing she enjoys most of all.<br><br>Here is my weblog extended auto warranty ([http://www.holzkunst-scholz.de/index.php?mod=users&action=view&id=7124 Our Webpage]) |
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| The '''1951 USAF resolution test chart''' is a [[optical resolution|resolution]] test pattern conforming to MIL-STD-150A standard, set by [[US Air Force]] in 1951. It is still widely accepted to test the [[resolving power]] of optical imaging systems such as [[microscopes]], [[cameras]] and [[image scanner]]s, although MIL-STD-150A was cancelled on October 16, 2006.<ref>MIL-STD-150A, its Change Notices and the Cancellation Notice are available from [http://assist.daps.dla.mil http://assist.daps.dla.mil]</ref> The pattern consists of groups of three bars (small [[Ronchi ruling]]s) with dimensions from big to small. The largest bar the imager cannot discern is the limitation of its resolving power.
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| ==Pattern format==
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| The common MIL-STD-150A format consists of six "groups" in three layers of patterns. The largest groups, forming the first layer, are located on the outer sides. The smaller layers repeat the same pattern but are progressively smaller toward the center. Each group consists of six elements, numbered from 1 to 6. Within the same layer, the odd-numbered groups appear contiguously from 1 through 6 from the upper right corner. The first element of the even-numbered groups is at the lower right of the layer, with the remaining 2 through 6, at the left. The scales and dimensions of the bars are given by the expression
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| :<math>\text{Resolution (lp/mm)} = 2^{\text{Group} + (\text{element}-1)/6}</math>
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| although usually the following lookup table will be used. The line pair (lp) means a black and a white line.
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| {| class="wikitable" style="text-align:center; width:100%"
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| |-
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| ! colspan="13" | Number of Line Pairs / mm in USAF Resolving Power Test Target 1951
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| ! colspan="13" | Group Number
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| | Element|| -2|| -1|| 0|| 1|| 2|| 3|| 4|| 5|| 6|| 7|| 8|| 9
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| |-
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| | 1|| 0.250|| 0.500|| 1.00|| 2.00|| 4.00|| 8.00|| 16.00|| 32.0|| 64.0|| 128.0|| 256.0|| 512.0
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| |-
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| | 2|| 0.280|| 0.561|| 1.12|| 2.24|| 4.49|| 8.98|| 17.95|| 36.0|| 71.8|| 144.0|| 287.0|| 575.0
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| |-
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| | 3|| 0.315|| 0.630|| 1.26|| 2.52|| 5.04|| 10.10|| 20.16|| 40.3|| 80.6|| 161.0|| 323.0|| 645.0
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| |-
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| | 4|| 0.353|| 0.707|| 1.41|| 2.83|| 5.66|| 11.30|| 22.62|| 45.3|| 90.5|| 181.0|| 362.0|| -----
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| |-
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| | 5|| 0.397|| 0.793|| 1.59|| 3.17|| 6.35|| 12.70|| 25.39|| 50.8|| 102.0|| 203.0|| 406.0|| -----
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| | 6|| 0.445|| 0.891|| 1.78|| 3.56|| 7.13|| 14.30|| 28.50|| 57.0|| 114.0|| 228.0|| 456.0|| -----
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| |}
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| {| class="wikitable" style="text-align:center; width:100%"
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| ! colspan="13" | Width of 1 line in micrometer in USAF Resolving Power Test Target 1951
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| ! colspan="13" | Group Number
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| | Element || -2 || -1 || 0 || 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9
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| | 1 || 2000.00|| 1000.00|| 500.00 || 250.00 || 125.00 || 62.50 || 31.25 || 15.63 || 7.81 || 3.91 || 1.95 || 0.98
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| | 2 || 1785.71|| 891.27 || 446.43 || 223.21 || 111.36 || 55.68 || 27.86 || 13.89 || 6.96 || 3.47 || 1.74 || 0.87
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| | 3 || 1587.30|| 793.65 || 396.83 || 198.41 || 99.21 || 49.50 || 24.80 || 12.41 || 6.20 || 3.11 || 1.55 || 0.78
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| | 4 || 1416.43|| 707.21 || 354.61 || 176.68 || 88.34 || 44.25 || 22.10 || 11.04 || 5.52 || 2.76 || 1.38 || -----
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| |-
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| | 5 || 1259.45|| 630.52 || 314.47 || 157.73 || 78.74 || 39.37 || 19.69 || 9.84 || 4.90 || 2.46 || 1.23 || -----
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| |-
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| | 6 || 1123.60|| 561.17 || 280.90 || 140.45 || 70.13 || 34.97 || 17.54 || 8.77 || 4.39 || 2.19 || 1.10 || -----
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| |}
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| == images ==
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| {{see also|commons:Category:Resolution test charts}}
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| <gallery>
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| File:USAF-1951.svg|USAF-1951 map, vector format
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| File:SilverFast Resolution Target USAF 1951.png|SilverFast USAF 1951 Resolution Target by LaserSoft Imaging
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| </gallery>
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| ==References==
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| <references/>
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| ==External links==
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| {{Portal|United States Air Force}}
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| * [http://www.efg2.com/Lab/ImageProcessing/TestTargets/#USAF1951 efg's Tech Note: USAF 1951 and Microcopy Resolution Test Charts.]
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| * [http://www.silverfast.com/show/resolution-target/en.html USAF 1951 Resolution Target] Further explanations and examples
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| * [http://www.normankoren.com/Tutorials/MTF5.html Koren 2003]: Norman Koren's updated resolution chart better suited for computer analysis
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| {{DEFAULTSORT:1951 Usaf Resolution Test Chart}}
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| [[Category:Imaging]]
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| [[Category:1951 introductions|Usaf Resolution Test Chart, 1951]]
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| [[Category:History of the United States Air Force]]
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Hello friend. Allow me introduce myself. I am Ron but I don't like when people use my complete name. Managing people is how she tends to make money and she will not alter it whenever quickly. Some time ago he selected to live in Idaho. To play handball is the thing she enjoys most of all.
Here is my weblog extended auto warranty (Our Webpage)