Matrix Vision mvBlueFOX, Техническое руководство, Страница: 192 / 255

19.9 Working with the Hardware Real-Time Controller (HRTC) 185
Figure 1: Take two images with different expose times after an external trigger
Note
Due to the internal loop to wait for a trigger signal, the WaitClocks call between "TriggerSet 1" and "Trigger
← -
Reset" constitute 100 . For this reason, the trigger signal cannot be missed.
Before the ExposeReset , you have to call the TriggerReset otherwise the normal flow will continue and the
image data will be lost!
The sensor expose time after the TriggerSet is
0 .
See also
Download this sample as an rtp file: 2Images2DifferentExposureTimes.rtp with two consecu-
tive exposure times (10ms / 20ms). To open the file in wxPropView (p. 77), click on "Digital I/O -
>
HardwareRealTimeController -
>
Filename" and select the downloaded file. Afterwards, click
on
"int Load( )"
to load the HRTC program. There are timeouts added in line 4 and line 14 to illustrate the
different exposure times.
Using a CMOS model (e.g. the mvBlueFOX-MLC205), a sample with four consecutive exposure times (10ms /
20ms / 40ms / 80ms) triggered just by one hardware input signal would look like this:
0. WaitDigin DigIn0->On
1. TriggerSet
2. WaitClocks 10000 (= 10 ms)
3. TriggerReset
4. WaitClocks 1000000 (= 1 s)
5. TriggerSet
6. WaitClocks 20000 (= 20 ms)
7. TriggerReset
8. WaitClocks 1000000 (= 1 s)
9. TriggerSet
10. WaitClocks 40000 (= 40 ms)
11. TriggerReset
12. WaitClocks 1000000 (= 1 s)
13. TriggerSet
14. WaitClocks 80000 (= 40 ms)
15. TriggerReset
16. WaitClocks 1000000 (= 1 s)
17. Jump 0
See also
This second sample is also available as an rtp file: MLC205_four_images_diff_exp.rtp .
MATRIX VISION GmbH