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Focusing on connection
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07/12/2007
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Collision avoidance systems are beginning to appear in luxury cars, with multiple cameras placed at strategic points around the vehicle to monitor the proximity of objects.
Connecting these cameras to the centralised video processor poses a real problem – especially when each camera may generate 16 or more bits of video information, together with several control signals.
Clearly, multiple parallel buses occupy considerable space and impose an undesirable weight burden; worse, this large amount of wiring can act as an effective aerial to channel locally generated high impulse interference into the system’s electronics.
The techniques required to enable automotive video applications highlight many of the challenges design engineers face in systems that combine multiple sources with a central display and/or control system. An example is the in vehicle system architecture shown in figure 1, with features such as navigation aid, entertainment subsystems, and cameras that scan lane changes, monitor object proximity and enhance night vision.
As in an industrial application, a network such as CAN may transport supervisory and control information, whilst a sub network moves video information. In European cars especially, this sub net may be the optical fibre based Media Orientated Systems Transport (MOST) network.
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Author
Naresh Shetty
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