Lumagen VisionPro - Manual (Page 5)

Vision Pro
™ User Manual and Installer Guide
© 2003 Lumagen, Inc. 2 Rev 1.13
Overview of the
VisionPro™
Video Processor
The primary functions of the
VisionPro are to act as a video switch, convert the selected
interlaced video input to progressive video and then scale the video resolution to match
the optimal resolution for the display. Converting interlaced video to progressive video is
referred to as “deinterlacing.” It is also sometimes called “line-doubling,” but this term is
misleading, so the term deinterlacing is preferred.
Interlaced video has been in use for more than 50 years and is still the most common
video format. It displays half of the lines of picture information each sixtieth (or fiftieth)
of a second. Each half of the image is called a field and displays either all the even lines,
or all the odd lines. So, an entire image, called a frame, takes a thirtieth (or twenty-fifth)
of a second to display on the screen. An “i” suffix on the resolution specification is used
to indicate interlaced formats.
In contrast, progressive video presents each frame as a whole, dramatically improving
image quality. A “p” suffix on the resolution specification is used to indicate progressive
formats.
The
VisionPro is comprised of four major functional sections:
•
Input selection, conversion to digital, and video decoding
•
Deinterlacing
•
Filtering and scaling
•
Conversion of the digital video to analog video
These functional blocks are shown below.
VisionPro Functional Block Diagram
RGB/
YP
R
P
B
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
Input 8
Deinterlace
Filtering
and Scaling
Input
A/D
and TV
Decoder
Digital-to-
Analog
Conversion
Pass-
through