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pattern) can be detected. Here, the standard distinguishes between four resolution
levels as shown in the table below.
Distinction level
Detection
Allocation
Recognition
Identification
Defects within the field of view
What is at stake here are features that describe the number, position, and size of bright
and dark spots within the field of view. These features are assessed by viewing a
standardised object that lights uniformly. The requirements of the military standard MIL-
I-49428 are complied with. This standard comprises the following specification:
Inner circle Ø 5.6mm; centre circle Ø 14.7mm; outer circle Ø 19mm
Size of defects
[µm]
400 or bigger
300 to 400
250 to 300
150 to 250
75 to 150
up to 75
Degree of recognition
The presence of an object is perceived.
The object is symmetric (or not), and
orientation is possibly detectable
To recognise the type of the object.
The object can be identified in details.
Number of defects
in range 1
0
0
0
1
3
not specified
400µm
300µm
250µm
150µm
75µm
Number of defects
in range 2
0
1
3
6
10
not specified
Room frequency
[Lp/m] for objects with
a size of 0.5m
4
(12.5cm broad stripes)
5.6
(9cm broad stripes)
16.0
(3.1cm broad stripes)
25.6
(2cm broad stripes)
Number of defects
in range 3
0
2
3
9
14
not specified
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