Baumer EXG03 Manuel de l'utilisateur - Page 8
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Timings:
A - exposure time
frame (n) effective
B - image parameters
frame (n) effective
C - exposure time
frame (n+1) effective
D - image parameters
frame (n+1) effective
Image parameters:
Offset
Gain
Mode
Partial Scan
8
2.2.
Timings
The image acquisition consists of two seperate, successively processed components.
Exposing the pixels on the photosensitive surface of the sensor is only the first part of the
image acquisition. After completion of the first step, the pixels are read out.
Thereby the exposure time (t
ed for the readout (t
) is given by the particular sensor and used image format.
readout
Baumer cameras can be operated with two modes, the Free Running Mode and the
Trigger Mode.
The cameras can be operated non-overlapped
used, and the combination of exposure and readout time:
Non-overlapped Operation
Here the time intervals are long enough
to process exposure and readout succes-
sively.
Exposure
Readout
Due to the differing CMOS sensor models installed to the Baumer EXG cameras, the
operation modes are subdevided into the respective camera models.
2.2.1. Free Running Mode
In the "Free Running" mode the camera records images permanently and sends them to
the PC. In order to achieve an optimal (with regard to the adjusted exposure time t
and image format) the camera is operated overlapped.
In case of exposure times equal to / less than the readout time (t
mum frame rate is provided for the image format used. For longer exposure times the
frame rate of the camera is reduced.
2.2.1.1.
EXG03 / EXG03c
t
Exposure
Readout
Flash
t
= t
flash
exposure
*)
Non-overlapped means the same as sequential.
) can be adjusted by the user, however, the time need-
exposure
or overlapped. Depending on the mode
*)
In this operation the exposure of a frame
(n+1) takes place during the readout of
frame (n).
Exposure
Readout
t
exposure(n)
exposure(n+1)
t
readout(n)
t
t
flash(n)
flash(n+1)
t
flashdelay
Overlapped Operation
≤ t
), the maxi-
exposure
readout
t
readout(n+1)
exposure