Chapter
115
Keys
Overview
A key is a function in which a part of the background
image is replaced by inserting an image or superimposed
text.
The signal used to cut out a portion of the background
image (ke
y source), signal to embed in the cutout portion
(key fill), and key source processing method (key type)
can be selected for a key.
The number of keys that can be
used on each switcher
bank is four when the system signal format is 2160P, and
eight when the system signal format is 1080P, 1080i, or
720P.
When M/E split is enabled, the number of keys that can
be
used will vary depending on the settings.
For details, see “Setting sub block keys” (page 384).
Key Fill and Key Source
The key fill signal can be set to a key bus signal or color
matte.
The key source signal can be selected using the following
thre
e modes.
Self mode: Use the same signal as the key fill signal.
Auto Select mode: Use the signa
l assigned as a pair with
the key fill bus signal on the cross-points.
Split mode: Select and use a different signal than the key
fi
ll bus pair signal.
Key Type
The key type sets the manner in which the key source is
used to cut out the background.
You can select the following key types.
Clean mode
In a luminance key or linear key, you can enable clean
mode.
When clean mode is enabled, key fill is added to the
backg
round without cutting out by the key source.
When clean mode is enabled, for the parts of the key fill
that
are not black (excluding the part that is inserted),
color is added to the background.
Note
Key type Description
Luminance key The background is cut out according to
the
luminance signal of the key source,
and at the same time the key fill is also
cut out by the key source and then
added to the background.
Linear key This is a type of luminance key, with a
re
duced variability in gain allowing more
precise adjustment.
Chroma key A key signal based on a particular color
i
s used to cut out the background, and
the key fill is then inserted.
Key wipe pattern
key
A wipe pattern of an independent key
transi
tion is used to cut out the
background, and the key fill is then
inserted.
Note
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