Progressive And Interlaced Video - Crestron C2N-DVP4DI Reference Manual

Digital Video Processor
Interlaced Scan
First half scan lines 1/60
Line 2
Line 4
Last Even
Line (524)
94 • Contents
color exist in a mathematical three-dimensional space, making it possible to specify
precise colors.
NOTE: The C2N-DVP4DI can accept Y, P
480p, 720p and 1080i require conversion to RGB. Crestron recommends a converter
made by Key Digital Systems, model number KD-CTCAL (www.keydigital.com)
for this application. Refer to page 96 for additional information about HDTV.

Progressive and Interlaced Video

Interlaced scanning is the standard for analog televisions. An interlaced scan draws
the lines of each picture frame in two separate passes. Half of the 525 scan lines are
drawn in the first pass (the even lines), and the other half (the odd lines) are drawn in
the second pass. A complete picture of odd and even fields is painted on the screen
30 times a second.
This technique was developed to compensate for the limited transmission
technologies available when television was new, and was satisfactory in its day.
However, improvements in display technology revealed some serious shortcomings
of interlaced signals. Image flicker is more noticeable on larger screens, and on the
edges of sharp objects. Vertically adjacent horizontal lines are not from the same
field (a 60th of a second apart) so motion displacement becomes noticeable,
especially on high-resolution displays.
Progressive scanning draws all 525 lines of a picture frame in a single top to bottom
th
scan in 1/60 of a second.
th
second
Crestron C2N-DVP4DI
, P directly for 480i and PAL only.
b r
Second half scan lines 1/60
Line 1
Line 3
Last Odd
Line (525)
Reference Guide – DOC. 6177A
th
second