Graphics Reference
In-Depth Information
Fig. 3.3
Left panel
Rearview camera;
Right panel
Smart rearview camera data flow. Optional
functions are shown in
light shade of gray
The imaging sensor is typically pointed at a downward angle and has 190
◦
field
of view which allows the camera to see potential obstacles from one rear corner to
the other. Entry level rearview camera provides only visual feedback to the driver.
In a 'smart' rearview camera, an image sensor provides incoming video frames to a
processor to analyze the video content for people and object detection.
Block diagram of rearview camera is shown in left panel of Fig.
3.3
.
The system is sending video output (NTSC, digital via LVDS, or compressed
video via Ethernet) to be displayed to the driver alongwith potential obstaclewarning.
Typical processing stages in the rearview camera system are shown in right panel
of Fig.
3.3
. In case of imaging sensor with raw output, the video frame needs to
be converted to YUV format before the lens distortion correcting (LDC) step. The
Image Signal Processor (ISP) processing pipe on the entry level rearview system is
tuned to maximize viewing quality when converting the raw input into a standard
video format to be displayed to the driver (viewing optimized processing pipe).
There is a constant demand for size reduction of the rearview camera system. The
miniaturization trend creates even more challenging thermal environment compared
to the front camera system.
3.3.3 Surround View Camera Systems
Surround view systems (SVS) present to the driver—a real-time 360
◦
view around
the vehicle, as well as park assist and bird's-eye view. The system operates with
minimum glass-to-glass latency and allows the driver to be fully aware of vehicle's
surroundings. For example, the system could allow a driver to see a toy that has
