Television Theory, Continued
Television and
Television and video cameras see light reflected from objects in a scene.
video cameras
This light varies according to the lighting and shade on an object. A
television camera is optically similar to a movie camera but it does not use
film.
Picture tube
The shape of a normal picture tube, or the aspect ratio is 3 to 4. It is the
ratio of the height to the width of a video frame or television tube. This
dimension approximates the dimensions or ratio of the normal range of
vision.
Figure 3-2 shows a representation of the aspect ratio of television.
Figure 3-2. —Television aspect ratio.
3-4
