Saturday, May 18, 2013
Not everyone tells the truth when they talk to a sheriff's deputy.
The facial recognition software being implemented by the Cumberland County Sheriff’s Office allows deputies to compare pictures with the jail’s database of about 50,000 images in search of a match.
Courtesy Dynamic Imaging Systems Inc.
When a suspect’s identification is in doubt, a deputy will take a person’s picture with a smartphone or a digital camera.
Courtesy Digital Imaging Systems Inc.
Some people even pretend to be someone they're not, to avoid an arrest warrant or dodge a traffic ticket.
Now, the Cumberland County Sheriff's Office has technology that will enable deputies to run quick checks to determine at least whether a person has ever been brought to the county jail.
Starting Monday, a deputy will be able to take a digital picture of someone and have a computer program compare it with a database of inmates' photos, to determine whether there's a match.
"We're a huge database because everybody coming through the agency ... their photo is in the system," said Sheriff Kevin Joyce.
The facial recognition software will enable the sheriff's office to easily use that vast database of images, and could hold promise for other police agencies.
"If we get a bank photo of somebody and we scan it and it's a good enough quality picture, it's going to give us leads of who it might be, and it's at least a starting point," Joyce said.
The county purchased the system for $35,000 from Dynamic Imaging Systems of Mount Laurel, N.J.
The computer maps the image of a person's face and converts it to a numerical composite, using factors like the size of the eyes, their distance from each other and their proximity to the nose.
The system ignores qualities that are prone to change, like facial hair, glasses and hair color, as well as race and gender.
The system requires human analysis. A demonstration by the sheriff's office showed that a picture of a white middle-age female inmate with dark brown hair returned not only her image, but also women with blond hair and some men, including a black man, as possible matches, because their facial proportions were similar.
The user's request can include parameters such as men of a certain race, and within a certain height and weight range. The system generates a score showing how likely it is that two images match
A deputy will take a person's picture with a smartphone or a digital camera, then email it to the county jail's server. The system will return a list of possible matches, ranked in order of probability.
"My vision, in the long run, is to bring on other agencies in Cumberland County to allow them to do their own searching through our database once we work out the kinks," Joyce said. There would be charge by the vendor for additional agencies.
The tool could be a welcome addition for other police agencies, said Robert Schwartz, executive director of the Maine Chiefs of Police Association.
"It's the wave of the future," he said. "Any tool you can get to help you with your job as a police officer, particularly in the identification (of suspects), is good."
The technology is still evolving and depends on a high-quality image. Most surveillance video probably doesn't generate clean enough images to yield good matches, though that technology also is improving.
The county plans to test a related system, in which a fingerprint reader that plugs into a laptop computer can be used to positively identify someone if their prints are on file with the county.
Capt. Craig Smith, head of investigations, noted that fingerprints are more precise and reliable for identification, but someone can refuse to have their fingerprints taken.
"You can just stand a few feet from them and take a picture," Smith said. "Particularly if they're not being cooperative, it's probably a little easier to get" a photo than a fingerprint.
There are implications for repeat offenders. The more times a person has been arrested and photographed at the jail, the more reliable a comparison will be.
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