1. An apparatus, comprising: circuitry configured to: capture at least one video frame of an anatomical region of a user; estimate a partially visible region in a current video frame of said anatomical region based on a temporal difference between said current video frame and a previous video frame of said anatomical region; detect at least one candidate pixel in said estimated partially visible region in said current video frame based on a difference of average intensity of corresponding image blocks of said current video frame and said previous video frame; determine at least one false-positive candidate pixel from said detected at least one candidate pixel; prune said at least one false-positive candidate pixel from said detected at least one candidate pixel; and determine a smoke region in said partially visible region based on said pruned at least one candidate pixel.