Matrox 4Sight-II Installation And Hardware Reference page 89

Pixel formatter
The pixel formatter has several functions as outlined below:
• Color component modification. If necessary to your application, the pixel
formatter can adjust the color components of the digitized video (U and V), so
that when displayed the video appears grayscale.
• Data remapping. Due to the presence of start-of-active-video (SAV) and
end-of-active-video (EAV) codes, video data can no longer have values of 0 and
255. The pixel formatter automatically remaps video data with these values, to
1and 254, respectively.
Matrox Orion /Dual can grab simultaneously from two cameras. The pixel
formatter has access to 2 Mbytes of SRAM to store a frame while processing
another frame. This reduces the risk of missing frames during transfers to the
display or processing.
Capture control
The capture control has the following functions:
• It receives clock and synchronization signals from video input devices and external
triggers.
• It 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. Set the capture control conditions using the
MIL/MIL-Lite MdigControl() function.
• It generates interrupts, based on various grabbing events. You can hook a function
to these events using the MdigHookFunction() function. The various events
causing an interrupt to be generated are listed in the following table:
Hook Type
M_GRAB_START
M_GRAB_END
M_GRAB_FIELD_END_ODD
M_GRAB_FIELD_END_EVEN
1
M_FRAME_START
Components of Matrox Orion /Standard and /Dual for 4Sight-II
Description
Hook to the start of each grab.
Hook to the end of each grab.
Hook to the end of grabbed odd fields.
Hook to the end of grabbed even fields.
Hook to the start of the incoming signal's frames.
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