In this paper, the flaming plastics (polyurethane) fire video, the flaming liquid (n-heptane) fire video, the smoldering
(pyrolysis) wood fire video and the smoldering Cotton fire video are captured. And these images are analyzed with the
optical flow method based on RGB color separations. The optical flows of the 4 types of fire are calculated to research the
patterns of optical flow in the combustion process.