1. A method of detecting fire and non-fire conditions, comprising: receiving a plurality of frames of video information; determining an energy indicator for each of a subset of the plurality of frames; detecting a fire condition in response to the energy indicator for each of the subset of the plurality of frames forming a pattern as a function of time corresponding to a fire condition; and detecting a non-fire condition in response to the energy indicator for each of the subset of the plurality of frames forming a pattern as a function of time corresponding to a non-fire condition.