Photon Focus MV3-D640I-M01-144-CL, User Manual, Page: 29 / 121

4.5 Overlapped Image Acquisition Timing
Exposure Start The exposure start is an event, which is generated, when a new exposure time
has been started.
Exposure End The exposure end is an event, which is generated, when a currently running
exposure time is finished.
Exposure active status signal is routed to the I/O control block and can there be selected for
output on the physical output line or on one of the available leds. Exposure start and exposure
end event can be used to trigger or to control other function in the camera, like acquisition,
frame and exposure control or counter and timer.
4.5 Overlapped Image Acquisition Timing
The camera is able to perform an overlapped image acquisition. It means, a new exposure can
be started during the image readout of the previous image. Fig. 4.10 shows an image
acquisition procedure when images are captured in overlapped mode. The status "Frame
Active" remains active during the acquisition of the three frames since there is no gap between
two frames. The "Frame Trigger Wait" is asserted during the frame read out in order to
indicate, that a new exposure can be started.
All examples in the previous sections show a non overlapping frame timing. A new frame is
always started after the previous image read out has been finished. All these examples work
also in the overlap mode. It doesn’t show the overlap mode in order to simplify the diagrams.
The overlapped image acquisition is not available, when the triggered controlled
exposure mode is configured.
E x p o s u r e 1 R e a d O u t 1
F r a m e 1
E x p o s u r e 2 R e a d O u t 2
F r a m e 2
E x p o s u r e N R e a d O u t N
F r a m e N
A c q u i s i t i o n A c t i v e
A c q u i s i t i o n S t a r t
T r i g g e r 1
A c q u i s i t i o n E n d
T r i g g e r 1
F r a m e S t a r t
T r i g g e r 1
F r a m e S t a r t
T r i g g e r 2
F r a m e S t a r t
T r i g g e r N
F r a m e
T r i g g e r
W a i t F r a m e
T r i g g e r
W a i t F r a m e
T r i g g e r
W a i t
A c q u s i t i o n
T r i g g e r
W a i t A c q u 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 S t o p ( )
F r a m e A c t i v e
F r a m e
T r i g g e r
W a i t
Figure 4.10: Overlapped Image acquisition Timing
There is a restriction of the overlapped image acquisition: The exposure time of the current
frame must not end prior to the end of the read out of the previous frame. Two different
timing situation needs to be distinguished:
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