Allied Vision Technologies MF-145B2 Instruction Manual download pdf (Page 159)

Marlin Technical ManualV.2.7.0

159

Controlling image capture

Secure image signature (SIS)

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 V3.03, all CCD Marlin 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)

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.

The handling of the SIS feature is fully described in the Chapter Secure image

signature (SIS) on page 217.

Note



• FirePackage offers additional and independent checks to

be performed for the purpose of image integrity. Details

can be found in the respective documentation.

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Allied Vision Technologies MF-145B2 Instruction Manual Page 159