TRACKIMO-FI-Drones-Searching-for-Lost-People-by-Following-Forest-Trails

Researchers at the University of Zurich, the Università della Svizzera italiana, and the University of Applied Sciences and Arts of Southern Switzerland have created a software that makes drones detect on their own and follow forest paths. With the introduction of these drones, it will be quicker and faster to find missing people in forests and mountain areas.

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Thousands of people lose their way in forests and mountain areas yearly. In Switzerland alone, about 1,000 calls come in emergency centers from lost and injured hikers. With this new software, drones can conveniently complement the work of rescue services teams. They are cheap and can be quickly deployed in large numbers. They also reduce to a large extent the response time and the risk of injury to missing people and rescue teams.

Artificial intelligence software has been developed by a group of researchers from the Dalle Molle Institute for Artificial Intelligence and the University of Zurich to teach a small quadrocopter to recognize and follow forest trails on its own. A first of its kind in the fields of artificial intelligence and robotics, this success means drones could soon be used in parallel with rescue teams to quicken the search for people lost in the wild.

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“While drones flying at high altitudes are already being used commercially, drones cannot yet fly autonomously in complex environments, such as dense forests. In these environments, any little error may result in a crash, and robots need a powerful brain in order to make sense of the complex world around them,” says Prof. Davide Scaramuzza from the University of Zurich.

The drone the Swiss researchers used observes the environment through a pair of small cameras like the ones used in smartphones. Rather than depending on sophisticated sensors, their drone makes use of very powerful artificial-intelligence algorithms to translate the images to recognize man-made trails. If a trail is visible, the software controls the drone in the corresponding direction. “Interpreting an image taken in a complex environment such as a forest is incredibly difficult for a computer,” says Dr. Alessandro Giusti from the Dalle Molle Institute for Artificial Intelligence. “Sometimes even humans struggle to find the trail!”

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The problem was solved by the Swiss team with a so-called deep neural network, a computer algorithm that learns to provide solutions to complex tasks from a set of “training examples,” just like the way a brain learns from experience.

So to get enough data to “train” their algorithms, the team hiked several hours along different trails in the Swiss Alps and took more than 20 thousand images of trails using cameras attached to a helmet. The effort yielded results. When it was tested on a new, previously unseen trail, the deep neural network was able to find the correct direction in 85 percent of the time.

What the Researchers Are Saying

Prof. Juergen Schmidhuber, scientific director at the Dalle Molle Institute for Artificial Intelligence, says, “Our lab has been working on deep learning in neural networks since the early 1990s. Today I am happy to find our lab’s methods not only in numerous real-world applications such as speech recognition on smartphones but also in lightweight robots such as drones. Robotics will see an explosion of applications of deep neural networks in coming years.”

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The research team, however, points out that there’s still more work to be done before a fleet that can work on their own will be deployed into forests in search of missing people.

Prof. Luca Maria Gambardella, director of the Dalle Molle Institute for Artificial Intelligence in Lugano, says, “Many technological issues must be overcome before the most ambitious applications can become a reality. But small flying robots are incredibly versatile, and the field is advancing at an unseen pace. One day, robots will work side by side with human rescuers to make our lives safer.”

Prof. Davide Scaramuzza from the University of Zurich adds, “Now that our drones have learned to recognize and follow forest trails, we must teach them to recognize humans.”

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