Methods and apparatus to optimize reference signature matching using watermark matching

    公开(公告)号:US12041301B2

    公开(公告)日:2024-07-16

    申请号:US17902659

    申请日:2022-09-02

    摘要: Methods, apparatus, systems and articles of manufacture are disclosed to optimize reference signature matching using watermark matching. An example disclosed herein includes selecting first unhashed reference signatures to evaluate for a second time segment of monitoring data based on watermark coverage of a first time segment of the monitoring data, the monitoring data obtained from a meter monitoring media presented by a media device and comparing the first unhashed reference signatures with first unhashed monitored signatures from the second time segment of the monitoring data. The example further includes, when a first media event associated with the monitoring data is not identifiable based on the comparing of the first of unhashed reference signatures with the first unhashed monitored signatures hashing the first unhashed monitored signatures to form a corresponding first hashed monitored signatures and comparing the first hashed monitored signatures with a library of reference hashed signatures to determine the first media event associated with the second time segment of the monitoring data.

    WATERMARKING MULTIMEDIA FRAGMENTS INTO TWO OR MORE VARIANTS

    公开(公告)号:US20240137624A1

    公开(公告)日:2024-04-25

    申请号:US18544544

    申请日:2023-12-19

    申请人: Nagravision S.A.

    发明人: Jean-Paul PANIS

    IPC分类号: H04N21/8358 H04N21/845

    摘要: A method of processing a multimedia fragment into two or more variants of the multimedia fragment, each variant having a different watermark, the method comprising: fragmenting a multimedia content into a sequence of fragments; watermarking a plurality of the fragments to create two or more variants of each of the plurality of fragments, wherein the two or more variants of one fragment are watermarked using different watermarks; adjusting the length of the two or more variants for at least one of the fragments to a same adjusted length, wherein the adjusted length is indicative of a temporal position of the two or more variants of the at least one of the fragments compared to variants of other fragments in the sequence of fragments.