| 摘要 |
To manage audio visual content, a stream of fingerprints is derived in a fingerprint generator and received at a fingerprint processor that is physically separate from the fingerprint generator. Metadata is generated by processing the fingerprints; the metadata is not directly encoded in the fingerprint. The metadata could be generated by: detecting the sustained occurrence of low values of an audio fingerprint to generate metadata indicating silence; comparing the pattern of differences between temporally succeeding values of a fingerprint with expected patterns of film cadence to generate metadata indicating a film cadence; and comparing differences between temporally succeeding values of a fingerprint with a threshold to generate metadata indicating a still image or freeze frame. The disclosed methods are likely to find application in automatically monitoring the large amounts of data associated with modern digital broadcasts. |
