Search International and National Patent Collections

1. (WO2011045424) METHOD FOR DETECTING AUDIO AND VIDEO COPY IN MULTIMEDIA STREAMS

Pub. No.:    WO/2011/045424    International Application No.:    PCT/EP2010/065551
Publication Date: Fri Apr 22 01:59:59 CEST 2011 International Filing Date: Sat Oct 16 01:59:59 CEST 2010
IPC: G06F 17/30
G06K 9/00
Applicants: TELEFONICA, S.A.
ANGUERA MIRO, Xavier
OBRADOR ESPINOSA, Pere
OLIVER RAMIREZ, Nuria
Inventors: ANGUERA MIRO, Xavier
OBRADOR ESPINOSA, Pere
OLIVER RAMIREZ, Nuria
Title: METHOD FOR DETECTING AUDIO AND VIDEO COPY IN MULTIMEDIA STREAMS
Abstract:
This invention proposes a multimodal detection of video copies. It first extracts independent audio and video fingerprints representing the changes in the content. It then proposes two alternative copy detection strategies. The full-query matching considers that the query video appears entirely in the queried video. The partial-query matching considers that only part of the query appears. Either for the full query or for each subsegment in the partial-query algorithm, the cross-correlation with phase transform is computed between all signature pairs and accumulated to form a fused cross-correlation signal. In the full-query algorithm, the best alignment candidates are retrieved and a normalized scalar product is used to obtain a final matching score. In the partial query, a histogram is created with optimum alignments for each subsegment and only the best ones are considered and further processed as in the full-query. A threshold is used to determine whether a copy exists.