Pothole Detection for the Visually Impaired

Over the years, researchers and companies have invented plenty of devices to help people with visual impairments avoid objects such as a desk or chair. Many of these gadgets used ultrasonic sensors to detect such hazards. Just to name a few, there was the discontinued Pathsounder (which hung around a person's neck), the cumbersome NavBelt (worn around the waist), and the wheeled GuideCane. However, there's another type of obstacle that lurks underfoot--slight depressions in the ground such as steps, curbs, or divots that can cause a person to stumble or a wheelchair to suddenly turn awry. "There's nothing in existence that we know of that detects non-protruding hazards," says Elaine Wong, an electrical engineer at Australia's University of Melbourne.