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1. 发明专利

GB2598065B Methods of storing media files and returning file data for media files and media file systems 未知
公开(公告)号：GB2598065B
公开(公告)日：2022-07-06
申请号：GB202116190
申请日：2016-04-15
申请人： GRASS VALLEY LTD
发明人： JAMES WESTLAND CAIN
IPC分类号： H04N21/845 , G06F16/71 , H04N5/76 , H04N21/854
摘要： A media file system, apparatus, computer program product and method for storing a media file in a media file system. An exemplary method includes obtaining a predetermined number of frames and determining a set of portions for storing the media file, each portion having an identifier that is indicative of a multiple of the predetermined number of frames. Further, for each portion of the set of portions, associating with the portion the segment of the media file containing the frame indicated by the identifier of the portion, and associating each of the remaining segments of the media file with a portion of the set of portions. Moreover, storing the media file in the media file system as the set of determined portions, each portion comprising its associated segments of the media file.

2. 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.

3. 发明专利

GB2521149B Adjusting occupancies of a set of buffers 未知
公开(公告)号：GB2521149B
公开(公告)日：2021-08-18
申请号：GB201321827
申请日：2013-12-10
申请人： GRASS VALLEY LTD
发明人： JEFF BUTTERS
IPC分类号： H04L25/05 , H04H60/04 , H04L7/00 , H04L47/30 , H04N5/262
摘要： The respective occupancies of a set of audio buffers are controlled via a common target occupancy value common to all the buffers in the set. This common target may take non-integral values. For each buffer, the difference is taken between the occupancy value of the buffer and the common target occupancy value. A sample is dropped or repeated as the difference exceeds half a sample. A recursive sum is formed of the fractional parts of the difference measures from the set of buffers and the recursive sum is used to adjust the common target occupancy value, within a selected range of values.

4. 发明专利

GB202105482D0 Hash-based media search 未知
公开(公告)号：GB202105482D0
公开(公告)日：2021-06-02
申请号：GB202105482
申请日：2014-06-24
申请人： GRASS VALLEY LTD
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.

5. 发明专利

CA3148535A1 SYSTEM AND METHOD OF BUILDING A DISTRIBUTED NETWORK FOR ESSENCE MANAGEMENT AND ACCESS 未知
公开(公告)号：CA3148535A1
公开(公告)日：2021-02-25
申请号：CA3148535
申请日：2020-08-21
申请人： GRASS VALLEY LTD
发明人： CAIN JAMES WESTLAND , RUSSELL BEN
IPC分类号： G06F16/41
摘要： A system is provided for building a distributed network for essence management and access. The system includes a media asset recording system that generates high quality copies and proxy copies of a media asset and an essence database that stores these copies. Moreover, a first source index stores asset entries that correspond to each of the copies of the media asset, respectively, with the media asset entries including metadata for a resolution, a video codec and an audio codec information relating to each respective copy. Moreover, a media asset monitor dynamically updates the respective media asset entries upon the media asset recording system generating each copy of the media asset. The system also includes a media essence provider that accesses a copy of the media asset based on a media access request from a media request application on a client device that specifies required parameters for the media asset.

6. 发明专利

CA3145470A1 SYSTEM AND METHOD OF REDUCING DISTORTION DURING DOWNSAMPLING 未知
公开(公告)号：CA3145470A1
公开(公告)日：2021-01-28
申请号：CA3145470
申请日：2020-07-23
申请人： GRASS VALLEY LTD
发明人： BUTTERS JEFFREY R
IPC分类号： H04N19/85 , G06T5/00 , G06T5/20 , G09G5/02
摘要： A video processing system is provided for reducing distortion in video signals. The system includes a first transfer function that applies a transfer function to a received video signal to generate a gamma corrected video signal in a first color space; and a first matrix component that transforms the gamma corrected video signal in the first color space to a gamma corrected signal in a second color space, and extracts a luminance component from the gamma corrected signal in the second color space. Moreover, the system includes a second transfer function that generates a gamma corrected downsampled video signal in the first color space, and a second matrix component that transforms the gamma corrected video signal in the first color space to a gamma corrected video signal in the second color space, and extracts the chroma component in the second color space.

7. 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.

8. 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.

9. 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.

10. 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.

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