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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.

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How Robots Can Help Us Act and Feel Younger

Toyota’s Gill Pratt on enhancing independence in old age

10 min read
An illustration of a woman making a salad with robotic arms around her holding vegetables and other salad ingredients.
Dan Page
Blue

By 2050, the global population aged 65 or more will be nearly double what it is today. The number of people over the age of 80 will triple, approaching half a billion. Supporting an aging population is a worldwide concern, but this demographic shift is especially pronounced in Japan, where more than a third of Japanese will be 65 or older by midcentury.

Toyota Research Institute (TRI), which was established by Toyota Motor Corp. in 2015 to explore autonomous cars, robotics, and “human amplification technologies,” has also been focusing a significant portion of its research on ways to help older people maintain their health, happiness, and independence as long as possible. While an important goal in itself, improving self-sufficiency for the elderly also reduces the amount of support they need from society more broadly. And without technological help, sustaining this population in an effective and dignified manner will grow increasingly difficult—first in Japan, but globally soon after.

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