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6.10. Smearless Mode
This mode will reduce the unwanted smear signal from a highlighted scene when a short
exposure time is used. The trigger mode is like edge pre-select, but a dummy readout is
performed before the active accumulation is started. It will remove the smear above the
highlighted parts in the image, but there is still smear left below highlighted areas.
The trigger leading edge will start the dummy readout. It takes 64 H before the exposure starts.
The exposure stops and the resulting video signal is read out after the selected shutter time. It
can be the 10 step normal or 2047 step programmable. SM=0 or SM=1.
This mode will operate with full and partial scanning and with V binning modes. If partial
scanning and binning is selected at the same time, partial scanning will have priority.
An EEN pulse will indicate the active accumulation time, and a WEN pulse indicates that the
resulting video is being read out.
To use this mode:
Set function: Trigger mode "Smearless read out"
Input:
Important notes on using this mode.
•
The start of exposure will start synchronized to the internal H signal. The start may be
shifted max 1H. To avoid this shift (1 H jitter), synchronize the camera to an external HD
and make sure that the trigger pulse aligns to the HD as shown in fig. 18.
•
The duration of the trigger should be >1H
•
A new trigger must not be applied before WEN is high.
•
In trigger modes there are no continuous VD out, only after each trigger input.
Table showing the figures for the different modes.
A
Scan mode
Full
3H
20H
1/2 Partial
21H
36H
1/3 Partial
21H
36H
1/6 Partial
21H
36H
V binning
3H
20H
Shutter mode "Normal" or "Programmable"
"Shutter Speed"
"Programmable exposure"
Polarity and other functions
Ext. trigger to pin 5 on 6 pin connector (or pin 11 on 12-pin connector).
Ext. HD to pin 6 on12-pin connector. (If used).
B
C
CCD array line #
8 to 1227
314 to 923
415 to 822
517 to 720
26+27 to 1212+1213
Fig. 24. Smearless Mode
CV-A2
D
E
Effective video
1220H
18H
610H
29H
408H
29H
204H
29H
594H
18H
- 18 -
TR = 6
SM=0, SM=1
SH=0 through 10
PE=1 through 2047
Max frame rate
Remarks
fps
15
28
40
70
30
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