
GUIDE TO INSTALLATION AND OPERATION
XVP-1801 |
21
3.5.4 The
Video Output
group
This group allows control over several aspects of the high definition and standard definition video output:
•
aspect
ratio
conversion
•
timing
control
•
image quality processing
•
metadata
insertion.
The upper portion of the panel is occupied by two video screen images, labelled
Input
and
Output.
These
screens do not show the actual video being processed by the XVP-1801, but rather show graphic images
that represent the geometric aspects of the input signal and the output that results after it is exposed to the
current ARC processing functions. The image is a green circle on a white background; the circle is used
because it is easy to see if it is asymmetrical. Lines on the images indicate protected areas for the AFD
implementation.
Aspect Ratio Conversion (ARC) modifies the video active picture shape as the signal is converted between
SD at 4:3 aspect ratio and HD/SD at 16:9 aspect ratio. If the input is simply stretched or squeezed to fit the
output, the image will be asymmetrically distorted; this is called
anamorphic
distortion. If the image is
expanded or contracted symmetrically, it must be cropped, and/or have new blank background segments
added to it, in order to fill the output picture. The ARC processing in the XVP-1801 allows a wide range of
symmetrical and asymmetrical picture size modification, coupled with cropping and background addition, to
be applied to an input signal.
When the Input AFD Mode is set to
Auto
, all the ARC settings are set automatically according to the AFD flag
(see the table in Annex 2 beginning on page 59) and cannot be changed by the user.
•
There are some exceptions – with certain input AFD codes the masks can be customized. Each
mask can be customized for each different AFD code allowing different mask settings according to
each specific code. For certain AFD codes that are less used, the masks cannot be configured and
will be de-activated.
Figure 3.8
SD (left) and HD (right) Video Output group – ARC tab