4 Image Acquisition
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 are two restrictions of the overlapped image acquisition: A new exposure cycle must not
start prior the end of a previous exposure cycle, and must not end prior to the end of the read
out of the previous frame. Two different timing situation needs to be distinguished:
Exposure Time > Read Out Time
An new exposure cycle can be started as soon as the read out
of the previous frame has been started (See Fig. 4.11).
Exposure Time < Read Out Time
The start of a new exposure has to be delayed by a certain
amount of time in order to ensure, that the exposure doesn’t end prior to the image read
out end of the previous frame (See Fig. 4.12).
The camera adjusts the timing automatically, and ensures that it complies with this restriction.
Frame start or frame burst start triggers which arrive too early and which violates the
overlapping restriction, will be ignored by the camera and indicated by a missed trigger event,
34 of 143
MAN093 08/2021 V1.1
Summary of Contents for MV4 Series
Page 8: ...CONTENTS 8 of 143 MAN093 08 2021 V1 1 ...
Page 12: ...1 Preface 12 of 143 MAN093 08 2021 V1 1 ...
Page 40: ...4 Image Acquisition 40 of 143 MAN093 08 2021 V1 1 ...
Page 42: ...5 Exposure Control 42 of 143 MAN093 08 2021 V1 1 ...
Page 52: ...6 Counter Timer 52 of 143 MAN093 08 2021 V1 1 ...
Page 64: ...10 Image Format Control 64 of 143 MAN093 08 2021 V1 1 ...
Page 66: ...11 Frame Rate 66 of 143 MAN093 08 2021 V1 1 ...
Page 82: ...12 Pixel Data Processing 82 of 143 MAN093 08 2021 V1 1 ...
Page 92: ...12 Pixel Data Processing 92 of 143 MAN093 08 2021 V1 1 ...
Page 96: ...13 Precautions 96 of 143 MAN093 08 2021 V1 1 ...
Page 120: ...16 Troubleshooting 120 of 143 MAN093 08 2021 V1 1 ...
Page 126: ...19 Support and Repair 126 of 143 MAN093 08 2021 V1 1 ...
Page 128: ...20 References 128 of 143 MAN093 08 2021 V1 1 ...