Ihedigbo, 28, visited the Ravens on Saturday and agreed to terms Sunday morning, according to a league source with knowledge of the situation.
Later Sunday, Ihedigbo indicated via his Twitter account that he had joined the defending AFC North champions after being released by the Patriots on Friday during the final major roster cut.
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“Fresh start,” Ihedigbo wrote. “God is good, honored to be a Baltimore Raven!”
The Ravens have been seeking help at safety because of injuries to Emanuel Cook, who underwent surgery on his broken right leg and was placed on injured reserve, and Sean Considine, who has been sidelined since the third preseason game after suffering a pair of concussions within one week.
No corresponding roster move has been announced.
Ihedigbo is a 6-foot-1, 214-pounder who started a dozen games last season for the Patriots and recorded 69 tackles and one pass deflection. He's also known as a physical special-teams contributor.
For his career, which includes three seasons with the New York Jets, Ihedigbo has made 118 tackles and five sacks.
He was a Walter Camp All-American at Massachusetts and signed with the Jets in 2008 after going undrafted.
Brown recorded three fumble recoveries and one interception during the preseason for Baltimore before being cut Friday.
The Ravens filled out their eight-man practice squad with former Pittsburgh Steelers backup quarterback Dennis Dixon and outside linebacker Adrian Hamilton, who was cut by the Dallas Cowboys after leading the nation with 20 1/2 sacks last season at Prairie View A&M. Dixon tried out for the Ravens in the spring along with Kyle Boller and Curtis Painter, who was released Friday.
“Watching their defense with Ray Lewis and Ed Reed, taking my talent to Baltimore was my best option,” Hamilton said in a telephone interview Sunday from the Dallas airport. “I bring a fire. I'm hungry to get to the quarterback. I want to help the team in any way possible, whatever it takes.”
Baltimore Sun reporter Jeff Zrebiec contributed to this article.