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Switcher Module Description
The Keyer Mezzanine:
■Demultiplexes parallel inputs from Keyer Carrier Module
■May use the key source and the key fill video to create a clipped and
gained key and a shaped video fill
■Can move the key horizontally in subpixel increments over a six pixel
range
■May modify offset and gain on the input video fill
■Generates two key fill mattes which can be substituted for the video
■Uses signals from the wipe generator to generate a wash between the
two mattes
■May mask the key with both force and inhibit masks
■Times the inputs
■Provides a washed matte border for preset patterns
Input signals for each Keyer Mezzanine Module are:
■Video fill source
■Video key source
Each of the Key Mezzanine Modules creates:
■A shaped video fill or washed matte
■A clipped, gained and masked key
The Keyer Mezzanine Module has circuitry to time the video and key
signals. The timing is set so that the signals are aligned at the output of the
Keyer Carrier Module even though the keyer path is longer (because of the
BORDERLINE and key NAM) than the background path.
The Keyer Mezzanine Module uses the box mask from the Keyer Carrier
Module, or the wipe masks from the Mix/Wipe Module, to mask the keys
and key fill. The keys can be filled with matte. The matte is generated by a
dual matte generator on the Key Mezzanine Module. The matte can be
modulated by the wipe signal from the Mix/Wipe Module.
The functions, inputs, outputs, and processor used for each of the Key
Carrier and Keyer Mezzanine combinations is given below.