The software could eventually allow smartphone-armed soldiers to target the location of their enemies. On the home front, the software could be used by everyone, including golfers judging distance to the green and biologists documenting the location of a rare animal without disturbing it.
"The great advantage of a smartphone is that it provides so many tools in a single, readily available, relatively inexpensive package," said Qia Wang, doctoral student at the University of Missouri College of Engineering, who led the development of the software, the journal Proceedings of the Society of Photo-Optical Instrumentation Engineers reported.
"For example, on the battlefield, a soldier needs a range-finder, compass, GPS and other tools to do reconnaissance before calling in an air strike. With our software, the soldier can have all those instruments in one device that can be purchased off the shelf," added Wang, according to a Missouri statement.
"When that soldier returns from war, he can use the same software to protect his family by clocking a speeder near her children's school and catching the culprit on video," said Wang.
Wang and his colleagues developed their software to locate and track: Targets of known size when the size of the target is known, a single image is enough to pinpoint the target's location.
The software computes the latitude and longitude of the target using the smartphones' GPS location, compass reading and the distance to the target based on the relative size of the target in the image compared to its known real-life size.
Targets of unknown size if the exact size of a target is unknown, the software uses two images to triangulate the location of the target.
Moving targets by taking a short video of a moving target, the smartphone software can calculate how fast the target is moving and in what direction it is going.
"Currently, our software is limited by the physical abilities of smartphone hardware, but the devices are improving rapidly," Wang said.
"We anticipate that improvements in GPS accuracy, battery life and camera resolution will allow our software to make even more accurate observations. We also are making our software more user-friendly."
The targeting and tracking software is not available commercially yet. A prototype version has been created and is currently being tested. More algorithms and methods are being developed to improve the speed and accuracy.
These findings were presented at the Geospatial InfoFusion II conference.
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