3-23
Signal Processor Frame
Keyer Mezzanine Board (064826)
The standard system has two Keyer Mezzanine Boards on each of the Key Carrier
Modules. One Keyer Mezzanine is for a background layer and the second Keyer
Mezzanine is for the key layer. Backgrounds can be used as keys in the “Layered
Mode.”
The Keyer Mezzanine:
■
Demultiplexes parallel inputs from Keyer Carrier Module
■
Uses 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
■
Modifies 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
■
Masks 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 Board are:
■
Video fill source
■
Video key source
Each of the Key Mezzanine Boards creates:
■
A shaped video fill or washed matte
■
A clipped, gained and masked key
The Keyer Mezzanine Board accepts parallel data from the Keyer Carrier Module
making the outputs parallel.
On the Keyer Mezzanine Board, video is separated into luminance and chroma.
The Keyer Mezzanine Board 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.
Video then goes through processing for gain, offset, and coring for noise reduction.
The key is clipped and gain adjusted, and the video is shaped by its key. Both the
video and key masks are added at this point. The signals are then sent off the
mezzanine onto the carrier module.
The Keyer Mezzanine Board 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 Board. 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 Mezzanines
on the M/E Key Carrier Modules are given below.
Summary of Contents for Grass Valley 4000
Page 3: ...iii Tektronix Grass Valley Products P O Box 1114 Grass Valley CA 95945 916 478 3800 ...
Page 4: ...iv Tektronix Grass Valley Products P O Box 1114 Grass Valley CA 95945 916 478 3800 ...
Page 34: ...1 20 Section 1 System Overview ...
Page 138: ...2 104 Section 2 Installation ...
Page 196: ...3 58 Section 3 Functional Description ...
Page 286: ...Index 6 Index ...