The 5-foot-11, 181-pound Martin was an honorable mention All-Big Ten selection after ranking second on the Spartans in receptions (66) and yards receiving (777) in 2011. He also returned punts and kickoffs.
Houston entered the draft looking for receiving depth, with Andre Johnson aging and no consistent threat behind him. The Texans took Ohio State receiver DeVier Posey in the third round.
The Texans began the fourth round by adding more depth to their offensive line, taking Georgia center Ben Jones. The 6-foot-2, 303-pound Jones will back up Chris Myers, who made his first Pro Bowl last year and signed a four-year deal in free agency.