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Chapter 1: Introduction
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Basics of Video Switching
“Video switching” refers to the process of switching between video images. You can use the unit to switch
between and mix videos (input signals) from multiple cameras, VTRs, and a computer.
By applying video effects, inserting text, and compositing images, you can create diverse and dynamic
program outputs.
Components of Transitions and Composites
The videos selected in rows A and B are used as a set in a transition or composite.
A
B
A
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Video A
Video B
Composite patterns
Transition patterns
Mix
Wipe
PinP
Chroma key
Luminance key
Output
Example: Wipe
Compositing Basics
Picture-in-picture (PinP) compositing
This is an effect achieved by embedding a video within another video. A rectangular area is removed from
one image, and the other image is inserted in that area.
A
B
B
Area in which the other image is inserted
Key compositing
This is an effect achieved by removing parts of an image and placing the cutout on another image that
serves as the background. To differentiate between the cutout image and the removed parts of the
image, a cutout signal (key signal) is created. There are various methods for creating key signals, but the
following describes the methods available on the unit; chroma keying and luminance keying.
Chroma keying
When using this method, create a key signal that uses color to differentiate between the cutout image
and the removed parts of the image. Typically, a subject is captured in front of a blue background,
commonly referred to as a "blue screen."
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Background (i.e., base) video
Overlay (i.e., key signal) video
Cutout image
Composited video
Luminance keying
When using this method, create a key signal that uses brightness to differentiate between the cutout
image and the removed parts of the image. Use this method to insert text onto a video. Typically, bright
colored text is created on a black background.
World Tour
World Tour
Black background
Text is used as cutout image
Background (i.e., base) video
Overlay (i.e., key signal) video
Composited video
