April 10, 2017

Researchers link robots into surveillance teams

Rod Kurcoba, Engineering Communications
Seeing many possible views of the same area from fixed and mobile cameras could be confusing to a human, but a computer can combine it all, track people and objects and notice significant events. Click to enlarge.

If you were monitoring a security camera and saw someone set down a backpack and walk away, you might pay special attention – especially if you had been alerted to watch that particular person. According to Cornell researchers, this might be a job robots could do better than humans, by communicating at the speed of light and sharing images.

The researchers are developing a system to enable teams of robots to share information as they move around and, if necessary, get help in interpreting what they see, enabling them to conduct surveillance as a single entity with many eyes. Beyond surveillance, the new technology might help when teams of robots relieve humans of dangerous jobs like disposing of landmines, cleaning up after a nuclear meltdown or surveying the damage after a flood or hurricane.

“Once you have robots that cooperate you can do all sorts of things,” said Kilian Weinberger, associate professor of computer science, who is collaborating with Silvia Ferrari, professor of mechanical and aerospace engineering and the project’s principal investigator, and Mark Campbell, the John A. Mellowes ’60 Professor in Mechanical Engineering.

Their work, “Convolutional-Features Analysis and Control for Mobile Visual Scene Perception,” is supported by a four-year, $1.7 million grant from the U.S. Office of Naval Research (ONR). The researchers will call on their extensive experience with computer vision to match and combine images of the same area from several cameras, identify objects and track objects and people from place to place. The work will require groundbreaking research, Weinberger said, because most prior work in the field has focused on analyzing images from just a single camera as it moves around. And often, Ferrari added, a camera that doesn’t move at all. The new system will fuse information from fixed cameras, mobile observers and outside sources.

The mobile observers might include autonomous aircraft and ground vehicles and perhaps humanoid robots wandering through a crowd. They will send their images to a central control unit, which might also have access to other cameras looking at the region of interest, as well as access to the internet for help in labeling what it sees. What make of car is that? How do you open this container? Identify this person.

The system might notice a significant face, then track that face through the crowd, Weinberger suggested. In earlier work, Ferrari developed what might be described as a robot game of Marco Polo, where a team of hunters track targets through a complex environment.

Knowing the context of a scene, robot observers may detect suspicious actors and activities that might otherwise go unnoticed. A person running may be a common occurrence on a college campus but may require further scrutiny in a secured area.

The core technology is a combination of “deep learning” that lets a computer interpret images, and “Bayesian modeling,” which allows it to continuously update its model of the world as new data comes in. The programming will also include a “planning function” to figure out how to obtain additional data that might be needed to resolve an uncertainty. It will help its mobile agents avoid obstacles and, if necessary, direct them to locations where a closer look is needed.

While the Navy might deploy such systems with drone aircraft or other autonomous vehicles, the Cornell researchers won’t be involved with any direct application of technology. However, the team does plan to test the system on the Cornell campus, using research robots to “surveil” crowded areas while drawing on an overview from existing webcams, Ferrari suggested.

In addition to the ONR grant, previous work by the researchers has been supported by the National Science Foundation and the U.S. Department of Energy.

Editor's note: This story has been updated to clarify Cornell’s role in the project, of which Silvia Ferrari is the principal investigator.