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1. 发明专利

GB2553125B Comparing video sequences using fingerprints 未知
公开(公告)号：GB2553125B
公开(公告)日：2022-03-09
申请号：GB201614435
申请日：2016-08-24
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS
IPC分类号： G06V20/40 , G06F16/732 , H04N7/01 , H04N21/234
摘要： A first sequence of video fingerprints at a first image repetition rate is compared with a second sequence of video fingerprints at a second, different image repetition rate. A converted sequence of fingerprints is generated from the first or second sequence of fingerprints by forming a combination of the values of a number of neighbouring fingerprints. The combination is a weighted average based on the temporal location of the respective neighbouring fingerprints in the first sequence of fingerprints with respect to the fingerprint in the converted sequence. A correlation is then performed between the converted sequence of fingerprints and the other sequence of fingerprints.

2. 发明专利

GB2599877B Comparing video sequences using fingerprints 未知
公开(公告)号：GB2599877B
公开(公告)日：2022-10-12
申请号：GB202200457
申请日：2016-08-24
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS
IPC分类号： G06V20/40 , G06F16/732 , H04N21/234
摘要： A first sequence of video fingerprints at a first image repetition rate is compared with a second sequence of video fingerprints at a second, different image repetition rate. A converted sequence of fingerprints is generated from the first or second sequence of fingerprints by forming a combination of the values of a number of neighbouring fingerprints. The combination is a weighted average based on the temporal location of the respective neighbouring fingerprints in the first sequence of fingerprints with respect to the fingerprint in the converted sequence. A correlation is then performed between the converted sequence of fingerprints and the other sequence of fingerprints.

3. 发明专利

GB2599877A Comparing video sequences using fingerprints 未知
公开(公告)号：GB2599877A
公开(公告)日：2022-04-13
申请号：GB202200457
申请日：2016-08-24
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS
IPC分类号： G06V20/40 , G06F16/732 , H04N21/234
摘要： A first sequence of video fingerprints at a first image rate is compared with a second sequence of video fingerprints at a second, different image rate. The fingerprints are temporal fingerprints or a combination of temporal and spatial fingerprints. A converted sequence of fingerprints is generated from the first sequence of fingerprints by forming a combination of the values of a number of neighbouring fingerprints, the converted sequence being generated at the second image rate or at a common image rate. The magnitude of the temporal fingerprints in the first sequence of fingerprints is scaled in accordance with a ratio of the first and second image rates. A correlation is then performed between the converted sequence of fingerprints and the other sequence of fingerprints. The combination may be a weighted average based on the temporal location of the respective neighbouring fingerprints in the first sequence of fingerprints with respect to the fingerprint in the converted sequence.

4. 发明专利

GB2527528B Hash-based media search 未知
公开(公告)号：GB2527528B
公开(公告)日：2021-09-29
申请号：GB201411192
申请日：2014-06-24
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS , GERARD PHILLIPS
IPC分类号： G06K9/00 , H04N21/235
摘要： A method of identifying an item of video content involves providing a spatial hash value and a temporal hash value for each image in a video collection. Each hash value is based on a measure of the entropy in differences between pixel values. A table of the pair of hash values against timecode is created and ordered according to one of the hash values. A search for a given pair of hash values can then be confined to that part of the table that matches the first value.

5. 发明专利

GB2591695A Hash-based media search 未知
公开(公告)号：GB2591695A
公开(公告)日：2021-08-04
申请号：GB202105482
申请日：2014-06-24
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS , GERARD PHILLIPS
IPC分类号： G06K9/00 , G06F16/583 , G06F16/783 , H04N21/235
摘要： A system for identifying video content, comprising: a query sequence processor configured to define a plurality of image sequences by a traveling window that encompasses a plurality of temporally separated video frames, the windowed frames being processed to form a spatial hash value 15, relating to differences between pixels within each image of the windowed sequence, and a temporal hash value 14, relating to differences between pixels of temporally separated frames of the windowed sequence; a database that stores the hash values in various ordered look-up tables 20, 30; and a search processor configured to search the ordered data 34, 24 for a sought hash value. The spatial and temporal hash values may comprise an entropy function and a frequency function. The relational database may comprise: an index ordered 12 first look-up table 10 of hash values and time codes 13; a second look-up table 20 ordered by one of the hash values; and a third look-up table that comprises single values for the ordering hash of the second table and a range of rows where that value of has is present in the second table.

6. 发明专利

GB2526102B Logo detection by edge matching 未知
公开(公告)号：GB2526102B
公开(公告)日：2020-09-23
申请号：GB201408461
申请日：2014-05-13
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS
IPC分类号： G06T7/00 , G06K7/14 , G06K9/20 , G06T7/10 , G06T7/30
摘要： To detect the presence of a logo in a search image, the positions of edges, in an image of the logo and in the search image, are represented by ratios of distances between the respective edge and a plurality of preceding edges. This can be carried out both horizontally and vertically. A sequence of edges at a selected position in the logo image is then compared with sequences of edges from a plurality of positions in the search image, and the position of the logo in the search image is determined from the position of a match between the respective sequences of edges.

7. 发明专利

GB2556612B MONITORING AUDIO-VISUAL CONTENT WITH CAPTIONS 未知
公开(公告)号：GB2556612B
公开(公告)日：2022-03-09
申请号：GB201606743
申请日：2016-04-18
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS
IPC分类号： H04N21/488 , H04N5/278
摘要： To monitor audio-visual content which includes captions, caption fingerprints are derived from a length of each word in the caption, without regard to the identity of the character or characters forming the word. Audio-visual content is searched to identify a caption event having a matching fingerprint and missing captions; caption timing errors and caption discrepancies are measured.

8. 发明专利

GB2591695B Hash-based media search 未知
公开(公告)号：GB2591695B
公开(公告)日：2021-12-08
申请号：GB202105482
申请日：2014-06-24
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS , GERARD PHILLIPS
IPC分类号： G06K9/00 , G06F16/583 , G06F16/783 , H04N21/235
摘要： A system for identifying video content, comprising: a query sequence processor configured to define a plurality of image sequences by a traveling window that encompasses a plurality of temporally separated video frames, the windowed frames being processed to form a spatial hash value 15, relating to differences between pixels within each image of the windowed sequence, and a temporal hash value 14, relating to differences between pixels of temporally separated frames of the windowed sequence; a database that stores the hash values in various ordered look-up tables 20, 30; and a search processor configured to search the ordered data 34, 24 for a sought hash value. The spatial and temporal hash values may comprise an entropy function and a frequency function. The relational database may comprise: an index ordered 12 first look-up table 10 of hash values and time codes 13; a second look-up table 20 ordered by one of the hash values; and a third look-up table that comprises single values for the ordering hash of the second table and a range of rows where that value of has is present in the second table.

9. 发明专利

GB2523311B Method and apparatus for managing audio visual, audio or visual content 未知
公开(公告)号：GB2523311B
公开(公告)日：2021-07-14
申请号：GB201402775
申请日：2014-02-17
申请人： GRASS VALLEY LTD
发明人： JONATHAN DIGGINS
IPC分类号： G06K9/00 , H04N21/8358
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 to detect 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.

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