基于视频的火焰检测，逐帧截取视频，三帧差分法获取动态目标，通过颜色判别，以及火焰特征判别，检测并框出火焰区域。(Video based flame detection, video capture by fr a me by fr a me, three fr a me difference method to obtain dynamic targets, by color discrimination, and flame characteristics discrimination, de