Table of Contents
Advertisement
1.1.
DEFINITIONS
Throughout this manual the following terms are used:
Image lattice:
A two-dimensional array of pixels.
Image:
The image lattice that represents the portion of the video picture area (frame) that is
being utilized for program content. The image area usually excludes letterbox bars and
pillarbox bars. May also be referred to as active image.
Image aspect ratio:
when displayed so that object shapes will retain their original shape (e.g. circles will
remain as circles).
Frame:
The image lattice that represents the maximum active picture area permitted in the
video signal. For baseband digital systems it has the specific meaning of the picture
area where the V bits and H bits are both set to 0.
Source frame:
The image lattice that represents the maximum active picture area permitted in the input
video signal.
Source frame aspect ratio: The ratio of horizontal dimension to vertical dimension of the source frame
when displayed so that object shapes within images that completely fill the source
frame will retain their original shape (e.g. circles will remain as circles).
Destination frame: The image lattice that represents the maximum active picture area permitted in the
output video signal. This rectangular area represents the result of the image conversion
process.
Destination frame aspect ratio:
destination frame when displayed so that object shapes within images that completely
fill the source frame will retain their original shape (e.g. circles will remain as circles).
Bar:
A region of a frame that is outside the image area. This region is often filled with a
uniform image (e.g. black or blue) or with an alternate image.
Cropping:
The action of removing part of the image in order to change the shape of the image.
Filling:
The action of scaling an image equally in both dimensions, and then filling unused
image areas with a bar in order to change the aspect ratio of the image. See "letterbox"
and "pillarbox"
Stretching (squeezing):
to change the aspect ratio of the image.
Letterbox:
Describes a frame where the image does not fill vertically, requiring bars without image
information at the top and/or the bottom of the image.
Pillarbox:
Describes a frame that the image does not fill horizontally, requiring bars at the left
and/or right sides of the image. Some publications refer to pillarbox in a 16:9 display
area by the term "sidebar".
Output video:
The output video signal of the aspect ratio converter.
The ratio of horizontal dimension to vertical dimension of the image area,
The ratio of horizontal dimension to vertical dimension of the
The action of compressing or expanding one dimension of an image in order
Revision 1.1
7700 MultiFrame Manual
7710ARC Series - SD Aspect Ratio Converter
7710ARC-3
Advertisement
Table of Contents
