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90 Chapter 6: The Matrox Orion modules for 4Sight-II
Hook Type
M_FIELD_START_ODD
M_FIELD_START_EVEN
1. These events occur even when a camera is connected but not grabbing.
Opto-isolated trigger
The opto-isolated trigger is available on both Matrox Orion modules; however,
note that it is not available through the "Video in 2" connector on the /Dual.
The capture control in the pixel converter accepts external trigger inputs, which
allow image acquisition to be synchronized to external events. The trigger signals
pass through an opto-coupler, a device that protects the board from outside surges.
The trigger source connects to the OPTOTRIG+ (pin 35) and OPTOTRIG- (pin
34) input pins of the video input connector; OPTOTRIG- is usually connected
to the ground of the trigger source. The voltage difference across OPTOTRIG+
and OPTOTRIG- must be between 4.05 V and 9.16 V for high level voltage, and
between -5.0 V and 0.8 V for low level voltage.
The capture control operates the trigger in next valid frame/field (synchronous)
mode; the digitizer waits for the next valid frame or field (as specified by the DCF
file) before commencing the grab.
Acquisition in next valid frame/field mode is executed in three ways:
• Edge-triggered monoshot/continuous acquisition. The pixel converter waits for
1
the rising/falling
• Level-sensitive "continuous" acquisition. The pixel converter grabs continuously
while the level of the trigger is high/low
• Level-sensitive monoshot acquisition. The pixel-converter waits for the trigger
to become high/low, to capture a single frame.
1. The polarity of the active and inactive levels of the trigger signal are programmable,
using the MIL/MIL-Lite MdigControl() function.
Description
1
Hook to the start of the incoming signal's odd fields.
1
Hook to the start of the incoming signal's even fields.
edge to capture a single frame.
1
.
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