Controlling image capture
STINGRAY Technical Manual
V2.2.0
181
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.
All Stingray 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
L
For all customers who know SIS from Marlin cameras:
•
Stingray 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 Stingray SIS fea-
ture the
endianness cannot be changed
.