User manual

Imagestore HDTV User Manual Overview
Miranda Technologies Ltd Page 61
Fade Keyer Up
Gradually displays the key input source of DSK 1 over the background video.
The rate in fields is set by the Fade Rate command.
Fade Keyer Down
Gradually removes the displayed key input source of DSK 1 from the
background video. The rate, in fields, is set by the Fade Rate command.
Fade Rate
The Fade Rate is adjusted using the arrow control keys ⊳  between 1 and
999 fields. Press the enter key to accept the value.
Note At 1080i/59.94 60 fields = 1 second.
Set Key Parameters
Keying is the process of inserting one video signal (referred to as the Fill
signal) into another video signal (referred to as the Background signal)
according to a third signal (referred to as the Key signal). There are two
separate processes to consider
♦ Generating the Key signal
♦ Using the Key signal
Oxtel series products implement keying where the Key is contained in the
luminance content of the SDI signal. The Key source is selected from either
the Fill input (known as Self Key) or a separate Key signal. Once selected,
the Key signal is processed with Clip, Gain and Transparency to alter the
mapping function between Key input luminance to Key output values.
Transparency modifies the maximum key value in the range 0 to 1.