Image Processing Basics - Digital Signal Processing: Fundamentals and Applications - page 746

FIGURE 14.44A
Grayscale video sequence.
with the cruise ship in 100% fade-in. Figure 14.44A displays the generated grayscale sequence.
Figure 14.44B shows the RGB color video sequence (also given in the color insert).
14.9 VIDEO SIGNAL BASICS
Video signals generally can be classified as component video, composite video, and S-video. In
component video , three video signals d such as the red, green, and blue channels or the Y, I, and Q
channels d are used. Three wires are required for connection to a camera or TV. Most computer
systems use component video signals. Composite video has intensity (luminance) and two-color
(chrominance) components that modulate the carrier wave. This signal is used in broadcast color TV.
The standard by the US-based National Television System Committee (NTSC) combines channel
signals into a chroma signal, which is modulated to a higher frequency for transmission. Connecting
TVs or VCRs requires only one wire, since both video and audio are mixed into the same signal.
S-video sends luminance and chrominance separately, since the luminance presenting black-and-white
intensity contains most of the signal information for visual perception.