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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

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.

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Allied Vision Technologies AVT Stingray Bedienerhandbuch Seite 182