CV-A1-20
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 54 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 16 step normal or 1023 step programmable. SM=0 or SM=1.
This mode will operate with full and partial scanning and with all binning modes. Partial
scanning together with binning will work, but it is not described, and no timing diagrams will be
documented. 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”
TR = 6
Shutter mode “Normal” or “Programmable”
SM=0, SM=1
“Shutter Speed”
SH=0 through 9
“Programmable exposure”
PE=1 through 1023
Polarity and other functions
Input:
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).
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. 17.
•
The duration of the trigger should be >1H to <2000H.
•
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.
1H = 83 6
µ
s
No equalize and serration pulses.
Scan mode
A
B
C
CCD array line #
D
Effective video
E
Max frame rate
fps
Remarks
Full
10H 14H 4 to 1038
1035H
18H
11
1/2 Partial
17H 33H 271 to 783
513H
25H
18
1/3 Partial
17H 33H 357 to 697
341H
25H
25
1/6 Partial
17H 33H 442 to 612
171H
25H
38
H binning
10H 14H 4 to 1038
1035H
18H
11
V binning
10H 14H 18
to
1019
501H
18H
20
V+H binning 10H 14H 18
to
1019
501H
18H
20
Fig. 25. Smearless Mode
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