Document number: TS RHDM-1701 - K5960056
Issue: 00
Release date: 3 aug 2010
Technical specifications
Page 36 of 52
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Table 9:
Safe area markers defined for 16:9 formats and relative to image
borders
•
For 4:3 signal formats and when the safe area markers are defined
relative to the image borders (standard definition 480i and 576i):
Table 10:
Safe area markers defined for 4:3 formats and relative to image
borders
NOTE:
The percentages define the reduction of the image on one side of the screen.
The reduction takes place at both sides of the screen and thus the total
reduction is defined as twice the percentage tabulated for both horizontal and
vertical.
Overscan note:
The EBU and ITU recommendations work under different assumptions: EBU
reduces the image by 18 pixels (2.5% of 720) of a SD signal to compensate
for overscan, while ITU starts from the full 720 pixel width. The display unit
always uses the full width of the signal, even when calculating EBU standard
safe area markers.
SMPTE note:
SMPTE only defines standards for safe area markers relative to image
borders. The display unit uses the percentages recommended by SMPTE for
safe area markers relative to the aspect ratio marker.
4:3 signal safe area markers note:
The standards only define safe areas for 4:3 signals for retention of the 14:9
central zone. The display unit will place the safe area markers relative to the
aspect ratio markers as well and the same percentage is used, as if it were
relative to the image borders.
Custom aspect ratio marker note:
When a custom aspect ratio marker has been specified, the standards
mentioned above do not define the safe area and the standard selection will
be locked on custom.
Содержание RHDM-1701
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