Measurement procedure. (a) Locate a 35 mm or larger format still camera, video camera, or digital equivalent such that the centre of the camera's image plane is located at Mr and the camera lens is directed at the centre of the display's rear- view image. (b) Affix a ruler at the base of the rear-view image in an orientation perpendicular with a test object cylinder centreline. If the vehicle head restraints obstruct the camera's view of the display, they may be adjusted or removed. (c) Photograph the image of the visual display with the ruler included in the frame and the rear-view image displayed.
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Measurement procedure. (a) Locate a 35 mm or larger format still camera, video camera, or digital equivalent such that the centre of the camera's image plane is located at Mr and the camera lens is directed at the centre of the display's rear- rear-view image.
(b) Affix a ruler at the base of the rear-view image in an orientation perpendicular with a test object cylinder centreline. If the vehicle head restraints obstruct the camera's view of the display, they may be adjusted or removed.
(c) Photograph the image of the visual display with the ruler included in the frame and the rear-view image displayed.
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Sources: Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations