Photon Focus MV4 Series, User Manual

Page: 26 / 143

4 Image Acquisition
4.2 Acquisition Control
A c q u i s i t i o n C o n t r o l
A c q u i s i t i o n S t a r t T r i g g e r
A c q u i s i t i o n E n d T r i g g e r
A c q u i s i t i o n T r i g g e r W a i t
A c q u i s i t i o n S t a r t
A c q u i s i t i o n E n d
A c q u i s i t i o n T r i g g e r
A
c q u i s i t i o n S t a r t ( )
A c q u i s i t i o n E n d ( )
A c q u i s i t i o n A c t i v e
Figure 4.2: Acquisition Control Block
4.2.1 Acquisition Start and Stop Commands, Acquisition Mode and Acquisition
Frame Count
The camera can only capture frames when the acquisition is started. The acquisition start
command, which is executed by the software, starts the acquisition and prepares the camera to
acquire frames. The acquisition is stopped, when the acquisition stop command is executed or -
depending on the acquisition mode parameter - a certain number of frames is captured.
Following acquisition mode parameters are available:
Acquisition Mode = Single Frame When the acquisition is started, the camera stops the
acquisition automatically as soon as one frame has been captured. To capture another
frame, the acquisition start command needs to be performed again.
Acquisition Mode = Multi Frame When the acquisition is started the camera stops the
acquisition automatically after a certain number of frames, which are defined by
acquisition frame count parameter, or when the acquisition stop command is executed.
Acquisition Mode = Continuous Frame
When the acquisition is started the camera captures
images continuously until the acquisition stop command is executed.
4.2.2 Acquisition Frame Rate and Acquisition Frame Rate Enable
With frame start trigger mode=off (see Section 4.3.1) and frame burst start trigger mode=off
(see Section 4.3.2), and when exposure mode is set to "timed" (see Section 4.4.1), the camera
generates frame start triggers internally according to the acquisition frame rate enable and
acquisition frame rate configuration:
Acquisition Frame Rate Enable = off The camera runs in the "free-running" mode. It means
frame start triggers are generated internally as soon as the camera is ready to start a new
image capture. The frame rate is defined by the exposure time and the ROI settings (see
Chapter 11).
Acquisition Frame Rate Enable = on
The camera generates frame start triggers internally
according to the acquisition frame rate configuration. See Chapter 11 for more
information about the range of supported frame rates.
Fig. 4.3 shows the procedure of a capture of N frames. The modes of acquisition start trigger,
frame start trigger and frame burst start trigger is set to off and the exposure mode is timed.
Once an acquisition start command has been executed, the camera starts capturing frames
until the acquisition stop command is received.
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