34 Chapter 4: Hardware reference
Video decoders
The acquisition section has 16 standard video decoders. In addition to digitizing
video, these decoders feature internal filtering and automatic gain control.
Gain
The automatic gain control (AGC) allows the video signal input range to be
optimized before being digitized. You can, however, disable the AGC and set the
gain manually, using the
MdigControl()
function, with
M_GRAB_AUTOMATIC_INPUT_GAIN
set to
M_DISABLE
and
M_GRAB_INPUT_GAIN
set to any integer value from 0 to 255.
Digitizing
component
The multi-standard video decoders can convert analog composite (CVBS) video
in NTSC/PAL format, to digitized video in YUV16 (4:2:2).
Each decoder supports the following video timing settings
:
Video capture controller
Once the analog video has been converted to digitized video, it enters a component
called the
video capture controller
.
The video capture controller accepts all data signals provided by the decoders and
transfers them to acquisition memory. It is also capable of performing vertical and
horizontal flipping of the image during capture.
Square pixel video formats
NTSC
PAL
Pixel sampling rate (MHz)
12.27 14.75
Y component sampling rate (
MHz)
12.27 14.75
U and V components (
MHz)
6.14 each
7.38 each
Digitizing component sampling rate (MHz)
24.54
29.5
Field rate (Hz)
60
50
Pixel/line (pixels)
780
944
Active pixel/line (pixels)
640
768
Active lines/frame (lines)
480
576
Line rate (KHz)
15.734
15.625
Summary of Contents for Morphis QxT
Page 1: ...Matrox Morphis QxT Installation and Hardware Reference Manual no 11002 101 0100 March 27 2007...
Page 6: ......
Page 7: ...Chapter 1 Introduction This chapter outlines the key features of the Matrox Morphis QxT board...
Page 16: ...16 Chapter 1 Introduction...
Page 26: ...26 Chapter 2 Hardware installation...
Page 30: ...30 Chapter 3 Using multiple Matrox Morphis QxT boards...
Page 74: ......
Page 76: ...Describe the problem...
