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Controlling image capture

PIKE Technical Manual V4.0.0

198

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, expo-

sure/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.

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Allied Vision Technologies Pike Manual de Instruções Página 198