Controlling image capture
PIKE Technical Manual
V5.0.0
215
Secure image signature (SIS): definition and
scenarios
SIS: Definition
Secure image signature (SIS)
is the synonym for data, which is inserted
into an image to improve or check image integrity.
With the new firmware 3.x, all Pike models can insert
•
Time stamp (1394 bus cycle time at the beginning of integration)
•
Trigger counter (external trigger seen only)
•
Frame counter (frames read out of the sensor)
•
AOI (x, y, width, height)
•
Exposure (shutter) and gain
•
Input and output state on exposure start
•
Index of sequence mode
•
Serial number
•
User value
into a selectable line position within the image. Furthermore the trigger
counter and the frame counter are available as advanced registers to be read
out directly.
SIS: Scenarios
The following scenarios benefit from this feature:
•
Assuming camera runs in
continuous mode
, the check of monotonically
changing bus cycle time is a simple test that no image was skipped or
lost in the camera or subsequently in the image processing chain.
•
In (synchronized)
multi camera applications
, the time stamp can be
used to identify those images, shot at the same moment in time.
•
The cross-check of the frame counter of the camera against the frame
counter of the host system also identifies any
skipped or lost images
during transmission.
•
The cross-check of the trigger counter against the frame counter in the
camera can identify a
trigger overrun
in the camera.
Note
For all customers who know SIS from Marlin cameras:
•
Pike cameras have
additional SIS features
: AOI,
exposure/gain, input/output state, index of sequence
mode and serial number.
•
In contrary to Marlin cameras, in the Pike SIS feature
the
endianness cannot be changed
.
