Autonomous Vehicle Engineering - July 2021 - 11
Sensors
in this case, refers to analog-to-digital converters in
the specified bit size. The digital conversion allows for
more subtle variances of color, contrast and exposure.
The frame rate drops with higher bit depth due to the
limited bandwidth accommodating the conversions.
Jellicoe explained that flicker mitigation could
be advantageous over cameras with a fixed frame rate.
" When you image anything that has a light source,
some frames have no light, and some frames have loads
of light, so it can be quite confusing, " he said. " It sounds
like Sony has solved that. "
Kishonti is excited about the high resolution of
Sony sensors. " HDR is probably the most important
piece, " he said. " If I want to see 500 meters away, then
I can use a specific small part of the image, kind of
like a virtual zoom. " He explained that detecting the
color of a traffic light several blocks away could help
determine broader traffic patterns and thereby suggest
if a car should slow down or maintain its pace.
Sony is promoting the use of its high-resolution
cameras and the potential adoption of onboard
ethernet communications. Nonetheless, Jellicoe, the
TTP consultant, said that high-resolution cameras
run the risk of producing too much data. " You end
up needing an enormous computer to wade through
it all, " he said. " Autonomous vehicles have not been
screaming out for high-resolution cameras, but it's
nice to see where Sony sees itself. "
Early Days
Sony launched the VISION-S project in 2018. Three
years later, its development advanced to the roadtesting
phase. AImotive's Kishonti described Sony's
requirements for the VISION-S ADAS system as a
" roadmap " rather than a specific set of requirements.
The VISION-S, after all, is an entirely new vehicle
platform being built from the ground up. He pointed
to the upgradable features of a smartphone (or Tesla's
pioneering over-the-air updates) as the framework for
launching a product. Sony can add more advanced
features in potential future releases.
When this author visited AImotive in Mountain
View in early 2020, engineers used a Toyota Prius mule
to demonstrate hands-off highway driving, traffic-jam
assist and automated valet parking in a multi-story structure.
The systems had minor flaws - such as difficulty
navigating around undifferentiated concrete elements
- but appeared well into developmental maturity.
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Autonomous Vehicle Engineering - July 2021
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