Specifications

Acquisition section 37
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 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.
Input lookup-tables 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.
Capture Control 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.
PF 1
PF 2
LUTs
MUX Color space
converter
To G400
From RGB
path or
decoder
Capture Control
Pixel Converter