  
The USAF 1951
standard targets are used in the TVT/NVT series measuring sets for testing visible
and NIR range
imaging systems. The USAF 1951 target consists of a series
of elements (patterns) decreasing in size, with a range sufficient to cover the
requirements of the systems under test. Each group consists of six elements,
which are progressively smaller. The elements within a group are numbered from 1
to 6. Odd-numbered groups appear contiguously, 1 through 6, at the upper right
corner. The first element of even-numbered groups is at the lower right, with
the remaining five elements, 2 through 6, at the left. Each even-odd pair make
up a layer, with the next smaller even-odd pair near the center. The standard
target element consists of two patterns (two sets of lines) at right angles to
each other. Each pattern consists of three lines separated by spaces of equal
width. Each line is five times as long as it is wide.
 
Fig.1. USAF 1951 targets of
different contrast
The USAF targets are available
commercially from many different sources. However,
the typical targets of
100% contrast
poorly simulate real low contrast targets. INFRAMET test systems use
a series of the USAF 1951 targets having different contrast and enable measurement
of the Minimal Resolvable Contract (MRC) function. The latter function is considered as the most
important characteristic of
CCD/CMOS cameras, ICCD
cameras and image intensifier systems
used for surveillance applications.
The USAFT 1951 targets of
the following contrast are available: 100%, 50%, 30%, 20%, 10%, 5%.
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