Aspect Ratios - Crestron UPX-2 Operation Manual

Crestron UPX-2
74 ¥ Universal Presentation Processor: UPX-2
In another de-interlacer scheme, each of the odd and even fields is scaled up to the
entire frame size. The de-interlacer interpolates between the existing lines, reducing
motion artifacts but significantly reducing vertical resolution.
Motion adaptive de-interlacing applies an algorithm that compares subsequent
frames, reducing the vertical resolution of only the portion of the image that has
moved.
Line doublers are designed to take advantage of the 3:2 pulldown technique used to
transfer film to video. Film is recorded at 24 frames per second. To match speeds
with video scanning (60 frames per second), the first film frame is captured onto
three video fields (even, odd, and even) then the second film frame is captured onto
two video fields (odd and even). This creates ten interlaced video fields for every
four film frames.
An advanced line doubler de-interlacer examines a series of frames, detects the
sequence and determines the pre-video film source. It then reassembles the original
progressive frames from the partial interlaced frames without resolution loss and
motion artifacts.

Aspect Ratios

Aspect ratio is a number that expresses the proportion of width to height. For
example, a movie screen has an aspect ratio of 1.85:1. Converting the height and
width dimensions to a fraction, and then reducing the fraction to a decimal,
determines the aspect ratio number.
Width divided by height: 20/10.8 = 1.85/1.
Knowing the image height and the aspect ratio, you can calculate the image width.
Figure 1. 4:3 Aspect Ratio
Some other common aspect ratios include 1.33:1 and 1.78:1. These are sometimes
referred to in whole number ratios as 4:3 and 16:9 respectively. The term 4:3 means
that the display is 4 units wide for every 3 units high (or 1.33 units wide for every
one unit high). 4:3 is the aspect ratio of standard television (NTSC); 16:9 is the
aspect ratio of HDTV.
Standard Aspect Ratios
FORMAT
16 mm Film
35 mm Film (before 1953)
35 mm Film (USA)
35 mm Film (Anamorphic)
70 mm Film
NTSC Video
PAL Video
HDTV
Universal Presentation Processor
ASPECT RATIO
1.33
1.33
1.85
2.35
1.85
1.33
1.33
1.78
Operations Guide – DOC. 6276C