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How can we ensure robot guide dogs bark up the right tree?

24 May 2024

Designers work with the blind and visually impaired to help overcome historic challenges facing the real-world deployment of robotic guide dogs.

(L-R) Donghyun Kim, Ivan Lee, Gail Gunn and Hochul Hwang. Credit: Zinj Guo
(L-R) Donghyun Kim, Ivan Lee, Gail Gunn and Hochul Hwang. Credit: Zinj Guo

Guide dogs enable remarkable autonomy and mobility for their handlers. However, only a fraction of people with visual impairments have one of these companions. 

The barriers include the scarcity of trained dogs, cost (which is $40,000 for training alone), allergies and other physical limitations that preclude caring for a dog.

Robots have the potential to step in where canines can't and address a truly gaping need – if designers can get the features right.

"We're not the first ones to develop guide dog robots," says Donghyun Kim, Assistant Professor and one of the corresponding authors of the award-winning paper.

"There are 40 years of study there, and none of these robots are actually used by end users. We tried to tackle that problem first so that, before we develop the technology, we understand how they use the animal guide dog and what technology they are waiting for."

The research team conducted semi-structured interviews and observation sessions with 23 visually impaired dog-guide handlers and five trainers. 

Through thematic analysis, they distilled the current limitations of canine guide dogs, the traits handlers are looking for in an effective guide and considerations to make for future robotic guide dogs.

One of the more nuanced themes that came from these interviews was the delicate balance between robot autonomy and human control. "Originally, we thought that we were developing an autonomous driving car," says Kim. 

They envisioned that the user would tell the robot where they want to go and the robot would navigate autonomously to that location with the user in tow.

This is not the case.

The interviews revealed that handlers do not use their dog as a global navigation system. Instead, the handler controls the overall route while the dog is responsible for local obstacle avoidance. 

However, even this isn't a hard-and-fast rule. Dogs can also learn routes by habit and may eventually navigate a person to regular destinations without directional commands from the handler.

"When the handler trusts the dog and gives more autonomy to the dog, it's a bit delicate," says Kim. "We cannot just make a robot that is fully passive, just following the handler, or just fully autonomous, because then [the handler] feels unsafe."

The researchers hope this paper will serve as a guide, not only in Kim's lab, but for other robot developers as well. "In this paper, we also give directions on how we should develop these robots to make them actually deployable in the real world," says Hochul Hwang, first author of the paper and a doctoral candidate in Kim's robotics lab.

For instance, he says that a two-hour battery life is an important feature for commuting, which can be an hour on its own. "About 90 percent of the people mentioned the battery life," he says.

"This is a critical part when designing hardware because the current quadruped robots don't last for two hours."

These are just a few of the findings in the paper. Others include: adding more camera orientations to help address overhead obstacles; adding audio sensors for hazards approaching from the occluded regions; and understanding 'sidewalk' to convey the cue, "go straight", which means follow the street (not travel in a perfectly straight line); and helping users get on the right bus (and then find a seat as well).

"Since we don't believe that guide dog robots will be available to individuals with visual impairments within a year, nor that we'll solve every problem, we hope this paper inspires a broad range of robotics and human-robot interaction researchers, helping our vision come to fruition sooner."

Ultimately, Kim understands that robotics can do the most good when scientists remember the human element. "My PhD and postdoctoral research is all about how to make these robots work better," Kim adds. 

"We tried to find [an application that is] practical and something meaningful for humanity."

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