Chapter 3
Camera Functions
page 18
User Manual pco.camera status 12/2004
3.3.3 Time Lapse
In this chapter the time-lapse feature is explained in de-
tail. The following acronyms are used:
t
exp
Exposure time for one image (adjustable)
t
read
Readout time for one image (from CCD-sensor)
(system inherent)
t
delay
Time delay between start-signal and exposure
(adjustable)
t
sys
Internal time delay in image sequence mode
(system inherent)
t
id
Internal time delay before exposure is started
(system inherent)
Single image recording
To record single images, each recording is started by its
own start- or trigger-event, which is either generated by
software (trigger mode - [soft trigger]) or by trigger signals
(trigger modes - [ext. trigger start] or [ext. trigger ctrl.]).
Two options are discussed:
-
delay time t
delay
= 0
-
delay time t
delay
> 0
1. Delay time t
delay
= 0
t
exp
t
read
time
t
id
Figure 3.9:
Time lapse illustration of the image recording for the
asynchronous image recording and delay time t
delay
= 0 mode.
The arrows indicate the beginning of each recording sequence
(the times are not drawn to scale).
The internal time t
id
(see Figure 3.) begins to elapse after
the corresponding start signal, which is actually much
shorter than displayed in Figure 3.. Then, the actual expo-
sure starts for time t
exp
exp
t
read
. Depending on the application, a new image recording
can be started after read out t
read
. The internal delay time
and the read out time are system inherent parameters.
2. Delay time t
delay
> 0
The start signal can also start an additional delay time
t
delay
preceding the actual exposure, if it is required (see
Figure 3.1010). It takes the internal time t
id
similar to the
earlier example (see Figure 3.1010, shorter than displayed
in the illustration in relation to t
exp
or t
read
) and then the ac-
tual exposure t
exp
is started. Finally the image is read out
for t
read
. Afterwards, a new recording can be started.
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