Pixel Converter - Matrox Orion Installation And Hardware Reference

Pixel Converter

Input lookup-tables
Capture Control
Pixel Converter
The Pixel Converter serves as an interface between Matrox
Orion's digitization section and the G400 chip. The Pixel
Converter contains the following stages: Pixel Formatters 1 and
2, input lookup tables, Color space converter, and Capture
Control.
Pixel Converter
PF 1
From RGB
path or
decoder
The Pixel Converter provides all signals required by the
digitization section, and formats the digitized data for the
MGA-G400. For example, the Pixel Formatter 2 can extract the
Y component from a YUV stream, or any component from the
RGB stream and feed it to the G400. In addition, the color-space
converter can convert RGB (BGR32) data to YUV16 (YUYV).
Due to the nature of the Matrox MGA-G400 controller, the data
that is passed to the G400 cannot have the values 0 and 255;
Pixel Formatter 2 automatically remaps these values to 1 and
254, respectively, before passing the data to the G400.
Matrox Orion has three 256x8-bit input LUTs, allowing
independent re-mapping of three 8-bit input streams. Note that
only RGB data can use the LUTs; YUV data bypasses the LUTs.
The Capture Control receives clock and sync signals from video
input devices, and sets the conditions under which to start and
end the grab. Examples of grabbing conditions are whether to
grab one or two fields per frame, or whether to start the grab
on an odd or even field.
MUX
LUTs
Capture Control
Acquisition section
PF 2
Color space
converter
37
To G400