The December 2022 issue of IEEE Spectrum is here!

Close bar

Blimps Seem Like the Friendliest Kind of Indoor Flying Robots

Georgia Tech's Miniature Autonomous Blimp can recognize and follow humans, and it's gentle enough to fly in your home

2 min read
Miniature Robotic Blimp.
Image: Georgia Tech

Every time we go to a conference, we see flying robots that aregetting smaller and more talented, capable of dynamically avoidingall sorts of obstacles, indoors and out. But that’s a lot of work. What’s less work is floating calmly through the air, without any concern for hurting people or running into things, or running out of battery: Such is the life of the gentle and slightly chubby Miniature Autonomous Blimp from Georgia Tech (GT-MAB), which can now detect faces and autonomously follow people around.

Using a blimp rather than something with spinning rotors solves lots of common problems with UAVs, though it also creates a few new ones. A blimp is inherently very safe, since impacts, even with people, are more comical than dangerous. Without wasting energy keeping itself aloft, battery life is measured in hours rather than minutes, and hovering in particular is very energy efficient, since it’s the default state of the blimp. The tradeoffs are that dynamic movement isn’t really possible, outdoor operation is a bad idea, and even if you’ve decided to call your blimp “miniature,” it’s not ever going to be particularly inconspicuous.

A blimp is inherently very safe, since impacts, even with people, are more comical than dangerous. Without wasting energy keeping itself aloft, battery life is measured in hours rather than minutes, and hovering in particular is very energy efficient, since it's the default state of the blimp.

But for some specific environments and use cases, like indoor interaction with people, miniature blimps seem like a very friendly idea, if they can be taught to do useful things. In particular, blimps could be good at detecting and following people, since they’re exceptionally stable, vibration free, and non-threatening even in close proximity.

GT-MAB was developed by a Georgia Tech team led by Professor Fumin Zhang. The researchers presented the face-tracking capability at the International Conference on Robotics and Automation (ICRA) in Singapore last week. 

Since the blimp can lift just 50 grams in total, one of the biggest challenges was minimizing the on-board hardware, which consists of five small motors (with propellers), a microcontroller, battery, wireless camera, and Xbee wireless module. Instead of using stereo vision or a 3D sensor to track people, the blimp’s camera beams the video to a ground PC, which runs the face-tracking algorithms and uses a Xbee module to transmit control signals back to the blimp. The tricky bit is then calculating the blimp-to-face distance to enable a courteous following behavior. Without any kind of depth information, the blimp uses prior knowledge of human face lengths to estimate distance from a monocular image, which only works because the blimp’s camera (unlike the camera on a quadrotor) is always face-parallel, and never pitching or rolling.

Once the blimp locks on to a person it wants to follow, it uses its five little propellers to help it translate in all three dimensions as well as yaw, and it works fairly well—at least as long as the “human is not moving too fast,” the researchers say. Seems reasonable to me. 

“Monocular Vision-based Human Following on Miniature Robotic Blimp,” by Ningshi Yao, Emily Anaya, Qiuyang Tao, Sungjin Cho, Hongrui Zheng, and Fumin Zhang from Georgia Institute of Technology, was presented at ICRA 2017 in Singapore.

The Conversation (0)

The Bionic-Hand Arms Race

The prosthetics industry is too focused on high-tech limbs that are complicated, costly, and often impractical

12 min read
Horizontal
A photograph of a young woman with brown eyes and neck length hair dyed rose gold sits at a white table. In one hand she holds a carbon fiber robotic arm and hand. Her other arm ends near her elbow. Her short sleeve shirt has a pattern on it of illustrated hands.

The author, Britt Young, holding her Ottobock bebionic bionic arm.

Gabriela Hasbun. Makeup: Maria Nguyen for MAC cosmetics; Hair: Joan Laqui for Living Proof
DarkGray

In Jules Verne’s 1865 novel From the Earth to the Moon, members of the fictitious Baltimore Gun Club, all disabled Civil War veterans, restlessly search for a new enemy to conquer. They had spent the war innovating new, deadlier weaponry. By the war’s end, with “not quite one arm between four persons, and exactly two legs between six,” these self-taught amputee-weaponsmiths decide to repurpose their skills toward a new projectile: a rocket ship.

The story of the Baltimore Gun Club propelling themselves to the moon is about the extraordinary masculine power of the veteran, who doesn’t simply “overcome” his disability; he derives power and ambition from it. Their “crutches, wooden legs, artificial arms, steel hooks, caoutchouc [rubber] jaws, silver craniums [and] platinum noses” don’t play leading roles in their personalities—they are merely tools on their bodies. These piecemeal men are unlikely crusaders of invention with an even more unlikely mission. And yet who better to design the next great leap in technology than men remade by technology themselves?

Keep Reading ↓Show less