NAC Image Technology SP-642, User Manual

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(00292)H 8 - 17
8.11 Long Term Recording with Post Trigger
(HX and GX-8 Cameras)
Use this method for long term recording using multiple HX and GX-8 cameras.
Applies to telephoto recording where the parallax generated can be ignored, depending on the
location of the cameras.
For example, recording at 10000pps with the GX-8 (model with 8GB memory) with a frame size
of 1024x768, and a pixel bit length of 10bit, 8.7 seconds (8704 frames) of recording is possible.
However, with 5 synchronized GX-8 (model with 8GB memory) cameras, set the “Initial Frame
Recorded” for each to 0, 8700, 17400, 26100, 34800, and record with the focal axis coordinated to
obtain data equivalent to about 43.5 (43504 frames) from the data from 5 cameras.
Camera Recording Start
Frame
Recording End
Frame
Recording
Start [sec] Recording End
[sec]
Camera 1 0 +8703 0 +8.703
Camera 2
+8700 +17403 +8.700 +17.403
Camera 3 +17400 +26103 +17.400 +26.103
Camera 4
+26100 +34803 +26.100 +34.803
Camera 5 +34800 +43503 +34.800 +43.503
■ Precautions for Post Trigger
・
With the exception of the trigger position, all of the camera settings used for post trigger
recording are identical.
・
Make the absolute frame time the exposure center time.
・
Use IRIG signals, the GX-HUB or external sync (EST) to sync all of the cameras.
However, if synchronizing with EST without using IRIG signals or the GX-HUB, the time for
each camera will not match.
■ Procedures for Settings for Long Term Recording with Post Trigger
(1) Sync Settings (Options/Camera Connection Settings)
If using the GX-HUB without IRIG signals, set the HX and GX camera time to the
GX-HUB time. Set the HX, GX camera time to IRIG, M-HUB time if using IRIG signals.
If not using IRIG signals or the GX-HUB but using EST signals, set the HX and GX
camera synchronization to EST. However, this is limited to when the time display does not
have to be correct.
(2) Camera Frame Time (Options/Camera Connection Settings)
Select the exposure time with the absolute frame time if displaying the time.
(3) Connect Cameras with HXLink
(4) Trigger Timing for Recording Parameters (Camera Details or List of Camera Settings)
Click “Detailed Settings” to open the window for “List of Camera Settings” and select the
trigger timing (CUSTOM) for the recording parameters and set “First Frame Recorded” in
the custom trigger dialogue to each of the cameras. Settings other than trigger position are
common for all of the cameras.
Camera 1
Camera 2
Camera 3
Camera 4
Camera 5
Time [sec]
0
Trigger
Detection
43.5