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Directive 2003/97/EC of the European Parliament and of the Council (repealed)Show full title
Directive 2003/97/EC of the European Parliament and of the Council of 10 November 2003 on the approximation of the laws of the Member States relating to the type-approval of devices for indirect vision and of vehicles equipped with these devices, amending Directive 70/156/EEC and repealing Directive 71/127/EEC (Text with EEA relevance) (repealed)
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- 2003 No. 97
- attachment 12
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Appendix
Calculation of the detection distance
1.CAMERA MONITOR DEVICE FOR INDIRECT VISIONU.K.
1.1.Resolution threshold of a cameraU.K.
The resolution threshold of a camera is defined by the formula:
where:
ωc
:
resolution threshold of the camera (arc-min)
βc
:
angle of vision of the camera (°)
Nc
:
number of video lines of the camera
The manufacturer shall supply the values for βc and Nc.
1.2.Determination of the critical viewing distance of the monitorU.K.
For a monitor having certain dimensions and properties, a distance to the monitor can be calculated within which the detection distance is dependent only on the performances of the camera. This critical viewing distance rm,c is defined by:
where:
rm,c
:
critical viewing distance (m)
Hm
:
height of the monitor image (m)
Nm
:
number of video lines of the monitor (-)
ωeye
:
resolution threshold of the observer (minutes of arch)
The number 60 is for conversion from minutes of arches to degrees.
The manufacturer shall supply the values for Hm and Nm.
ωeye = 1
1.3.Determination of the detection distanceU.K.
1.3.1.Maximum detection distance within the critical viewing distance where, due to the installation, the distance eye-monitor is less than the critical viewing distance, the maximum attainable detection distance shall be defined by:U.K.
where:
rd
:
detection distance [m]
Do
:
diameter of the object [m]
f
:
threshold increasing factor
ωc, βc and Nc according to item 1.1
D0= 0,8 m
f = 8
1.3.2.Detection distance greater than the critical viewing distance. Where, due to the installation, the distance eye-monitor is more than the critical viewing distance, the maximum obtainable detection distance shall be defined:U.K.
where:
rm
:
viewing distance to the monitor (m)
Dm
:
diagonal of the monitor screen (inch)
Nm
:
number of video lines of the monitor (-)
βc and Nc according to point 1.1
Nm and ωeye according to point 1.2
2.SECONDARY FUNCTIONAL REQUIREMENTSU.K.
Based on the installation conditions, a determination shall be made to discover whether the entire device can still satisfy the functional requirements listed in Annex II, especially the glare correction, the maximum and the minimum luminance of the monitor. It shall also be determined the degree to which the glare correction will be addressed and the angle at which sunlight can strike a monitor and these shall be compared to the corresponding measuring results from the system measurements.
This can be based on either a CAD-generated model, a determination of the angles of light for the device when mounted on the relevant vehicle, or by carrying out relevant measurements on the relevant vehicle as described in Annex II, part B, point 3.2.
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