BMW G12 - Intelligent Safety

G12�Driver�Assistance�Systems
3.�KAFAS
8
3.3.�Road�sign�recognition
The�KAFAS�stereo�camera�is�also�responsible�for�detecting�top�speed�limitation�road�signs.
The�detection�of�no�overtaking/overtaking�permitted�signs�or�markings�is�also�implemented�in
the�G12.
3.4.�Lane�detection
The�KAFAS�stereo�camera�installed�in�the�mirror�base�of�the�interior�mirror�on�the�windshield�monitors
the�area�in�front�of�the�vehicle.
KAFAS�stereo�camera
Index Explanation
1 KAFAS�stereo�camera
2 Rain‐light‐solar-condensation�sensor
3 Photosensor�for�electrochromic�interior�mirror
The�KAFAS�stereo�camera�records�the�roadway�up�to�approximately�40m�ahead�of�the�vehicle�and
up�to�approximately�5m�to�the�right�and�left�of�the�vehicle.�The�image�data�is�then�evaluated�by�the
KAFAS�control�unit�integrated�in�the�KAFAS�stereo�camera.�Using�image�processing,�the�control�unit
searches�the�images�recorded�by�the�KAFAS�stereo�camera�for�lane�and�road�markings.
The�appearance�of�the�road�markings�can�vary�considerably�in�the�image�depending�on�the�country,
type�of�road�or�the�current�ambient�conditions.�The�system�can�detect�a�wide�range�of�road�markings
and�types�of�markings.�For�a�lane�marking�to�be�evaluated,�the�KAFAS�stereo�camera�and�the�KAFAS
control�unit�must�first�be�able�to�clearly�identify�it.�A�lane�must�also�have�an�average�width�greater�than
2.5m�for�it�to�be�evaluated.