New way for self-driving cars to 'see' objects

Scientists have developed a simple, cost-effective method to allow self-driving cars to 'see' 3D objects in their path.

The laser sensors currently used to detect 3D objects in the paths of autonomous cars are bulky, ugly, expensive, energy-inefficient -- and highly accurate.

These Light Detection and Ranging (LiDAR) sensors are affixed to cars' roofs, where they increase wind drag, a particular disadvantage for electric cars.

They can add around USD 10,000 to a car's cost. Despite their drawbacks, most experts have considered LiDAR sensors the only plausible way for self-driving vehicles to safely perceive pedestrians, cars and other hazards on the road.

Scientists from Cornell University in the US have discovered that a simpler method, using two inexpensive cameras on either side of the windshield, can detect objects with nearly LiDAR's accuracy and at a fraction of the cost.

The researchers found that analysing the captured images from a bird's eye view rather than the more traditional frontal view more than tripled their accuracy, making stereo cameras a viable and low-cost alternative to LiDAR.

"One of the essential problems in self-driving cars is to identify objects around them -- obviously that's crucial for a car to navigate its environment," said Kilian Weinberger, associate professor at Cornell.

"The common belief is that you couldn't make self-driving cars without LiDARs. We've shown, at least in principle, that it's possible," Weinberger said.

Ultimately, Weinberger said, stereo cameras could potentially be used as the primary way of identifying objects in lower-cost cars, or as a backup method in higher-end cars that are also equipped with LiDAR.