Multimedia Tools and Applications vol:70 issue:1 pages:159-175
This paper presents a novel unsupervised method for identifying the semantic
structure in long semi-structured video streams. We identify chains, i.e., local clusters of repeated features from both the video stream and audio transcripts. Each chain serves as an indicator that the temporal interval it demarcates is part of the same semantic event. By layering all the chains over each other, dense regions emerge from the overlapping chains, from which we can identify the semantic structure of the video. We present two clustering strategies that accomplish this task, and compare them against a baseline Scene Transition Graph approach. We then develop a commentator that provides a semantic labeling of the resultant video segmentation.