Photon Focus MV2-D1280-640, User Manual, Page: 25 / 85

Figure 4.6: Timing in triggered simultaneous readout mode
4.1.3 Maximum Frame Rate
The maximum frame rate depends on the exposure time, the readout scheme and the size of
the image (see Region of Interest, Section 4.5.1). In most cases, simultaneous readout is the
best choice for highest framerate.
4.1.4 Constant Frame Rate (CFR)
When the CFR mode is switched on, the frame rate (number of frames per second) can be
varied from almost 0 up to the maximum frame rate. Thus, fewer images can be acquired than
would otherwise be possible.
When Constant Frame Rate is switched off, the camera delivers images as quickly as possible,
depending on the exposure time and the read-out time. See Section 5.3.2 for more
information.
Constant Frame Rate mode (CFR) is not available together with external trigger
mode.
4.2 Image Information
There are camera properties available that give information about the acquired images, such
as an image counter, average image value and the number of missed trigger signals. These
properties can be queried by software.
4.2.1 Counters and Average Value
Image counter The image counter provides a sequential number of every image that is output.
After camera startup, the counter counts up from 0 (counter width 24 bit). The counter
can be reset by the camera control software.
Missed trigger counter The missed trigger counter counts trigger pulses that were ignored by
the camera because they occurred within the exposure or read-out time of an image. In
free-running mode it counts all incoming external triggers. (Counter width 8 bit / no wrap
around).
Average image value The average image value gives the average of an image in 8 bit format
(0 .. 255 DN), regardless of the currently used grey level resolution.
4.2 Image Information 23