Detecting video phenomena, such as fire in an aircraft cargo bay, includes receiving a plurality of video images from a plurality of sources, compensating the images to provide enhanced images, extracting features from the enhanced images, and combining the features from the plurality of sources to detect the video phenomena. In an ink jet head configured by linking multiple head modules together, each head modules is mounted on a base frame supported by a head module support unit provided on the base frame. The lateral swinging motion is combined with a longitudinal self steering capability. The surface of each silicide layer is positioned above the surface of the semiconductor substrate. After the distribution of the content by the streaming technique is completed, the distributing apparatus distributes difference data, which is a portion of the content that has not been saved in the recipient apparatus, by downloading technique.