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10.5 Transmission Delay
Another approach for packet sorting in multi-camera operation is the so-called Transmis-
sion Delay.
Due to the fact, that the currently recorded image is stored within the camera and its
transmission starts with a predefined delay, complete images can be transmitted to the
PC at once.
The following figure should serve as an example:
For the image processing three cameras with different sensor resolutions are employed –
for example camera 1: VLG-12M.I, camera 2: VLG-20M.I, camera 3: VLG-02M.I.
Due to process-related circumstances, the image acquisitions of all cameras end at the
same time. Now the cameras are not trying to transmit their images simultaniously, but –
according to the specified transmission delays – subsequently. Thereby the first camera
starts the transmission immediately – with a transmission delay "0".
Time Saving in Multi-Camera Operation 10.5.1
As previously stated, the transmission delay feature was especially designed for multi-
camera operation with employment of different camera models. Just here an significant
acceleration of the image transmission can be achieved:
For the above mentioned example, the employment of the transmission delay feature
results in a time saving – compared to the approach of using the inter packet gap – of ap-
prox. 45% (applied to the transmission of all three images).
◄ Figure 47
Principle of the trans-
mission delay.
◄ Figure 48
Comparison of trans-
mission delay and inter
packet gap, employed
for a multi-camera sys-
tem with different cam-
era models.