Method, Device and Computer Program Product for Demultiplexing of Video Images
First Claim
1. A method for demultiplexing time-division multiplexed digital video data which originates from multiple sources, the method comprising:
- retrieving a first set of digital video data representative of a first image from the time-division multiplexed digital video data;
storing the first set of digital video data to a memory location associated with a first source such that the first set of digital video data is representative digital video data of the first source;
retrieving a current set of digital video data representative of a current image;
calculating a difference ratio using the representative digital video data and the current set of digital video data; and
if the difference ratio is above a threshold, producing a display query requiring response for classifying the current digital video data as belonging to an identified source or originating from a new source, wherein the first source is an identified source.
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Accused Products
Abstract
A method for demultiplexing time-division multiplexed digital video data which originates from multiple sources in which the time-division multiplexed images are not indexed nor is there identification information provided to differentiate sources. The sources are generally cameras which may be stationary cameras or moving cameras that rotate as are commonly used in the surveillance industry. A first set of digital video data representative of a first image is retrieved from a memory source or from a video tape. The first set of digital video data is stored to a memory location associated with a first source. The first set of video data is also identified as representative video data of the first source. A second set of digital video data representative of a current image is then retrieved. A difference ratio is calculated using the representative digital video data and the current set of digital video data. If the difference ratio is above a threshold, a display query requiring response for classifying the current digital video data as belonging to an identified source or originating from a new source is presented to a user of the system. If a response is received indicating that the current set of digital video data is associated with a new source, the current set of digital video data is stored to a second memory location associated with the second source. This current set of digital video data is then identified as the representative video data for the second source.
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Citations
58 Claims
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1. A method for demultiplexing time-division multiplexed digital video data which originates from multiple sources, the method comprising:
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retrieving a first set of digital video data representative of a first image from the time-division multiplexed digital video data;
storing the first set of digital video data to a memory location associated with a first source such that the first set of digital video data is representative digital video data of the first source;
retrieving a current set of digital video data representative of a current image;
calculating a difference ratio using the representative digital video data and the current set of digital video data; and
if the difference ratio is above a threshold, producing a display query requiring response for classifying the current digital video data as belonging to an identified source or originating from a new source, wherein the first source is an identified source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 29, 58)
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14. A method for demultiplexing time-division multiplexed digital video data which originates from multiple sources, the method comprising:
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retrieving a first set of digital video data representative of an image;
storing the first set of digital video data to a memory location associated with a first source such that the first set of digital video is representative digital video of the first source;
retrieving a current set of digital video data representative of an image;
selecting a subset of the first set of digital video data;
selecting a subset of the current set of digital video data such that the subset of the first set and the subset of the current set contain identical pixel locations;
calculating a difference measurement between the subset of the first set and the subset of the current set;
calculating a difference ratio based upon the difference measurement; and
if the difference ratio is above a threshold, producing a display query requiring response for classifying the digital video data as belonging to an identified source or originating from a new source. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30)
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26. A method for demultiplexing time-division multiplexed digital video data that originates from a plurality of sources, the method comprising:
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receiving a time-division multiplexed digital video sequence; and
comparing digital video data from parsed frames, parsed frames being successively parsed from the time-division multiplexed digital video sequence, so as to have substantially all parsed frames identified with one of a plurality of sources in a single pass through the time-division multiplexed digital video sequence. - View Dependent Claims (27, 28)
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31. A computer program product for use with a computer for demultiplexing time-division multiplexed digital video data which originates from multiple sources, the computer program product having computer readable code thereon forming a computer program, the computer program comprising:
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computer code for retrieving a first set of digital video data representative of a first image;
computer code for storing the first set of digital video data to a memory location associated with a first source;
computer code for retrieving a current set of digital video data representative of a current image;
computer code for calculating a difference ratio using the first set of digital video data and the current set of digital video data; and
computer code for producing a display query requiring response for classifying the digital video data as belonging to an identified source or originating from a new source if the difference ratio is above a threshold, wherein the first source is an identified source. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A computer program product for use with a computer for demultiplexing time-division multiplexed digital video data which originates from multiple sources, the computer program product having computer readable code thereon forming a computer program, the computer program comprising:
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computer code for retrieving a first set of digital video data representative of an image;
computer code for storing the first set of digital video data to a memory location associated with a first source such that the first set of digital video is representative digital video of the first source;
computer code for retrieving a current set of digital video data representative of an image;
computer code for selecting a subset of the first set of digital video data;
computer code for selecting a subset of the current set of digital video data such that the subset of the first set and the subset of the current set contain identical pixel locations;
computer code for calculating a difference measurement between the subset of the first set and the subset of the current set;
computer code for calculating a difference ratio based upon the difference measurement; and
computer code for producing a display query requiring response for classifying the digital video data as belonging to an identified source or originating from a new source if the difference ratio is above a threshold. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A video surveillance system comprising:
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a plurality of cameras wherein each camera outputs a video signal a processor for receiving each video signal and multiplexing the signal into a time-division multiplexed video signal; and
memory for storing the multiplexed video signal;
wherein when the processor receives a demultiplexing request, the processor demultiplexes the time-division multiplexed video signal in a single pass through the time-division multiplexed video signal.
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53. A device for demultiplexing time-division multiplexed digital video data which originates from multiple sources, the device comprising:
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a retrieval module for retrieving a first set of digital video data representative of a first image and retrieving a current set of digital video data representative of a current image;
a storage module for storing the first set of digital video data to a memory location associated with a first source;
a calculation module for calculating a difference ratio using the first set of digital video data and the current set of digital video data; and
a query module for producing a display query requiring response for classifying the digital video data as belonging to an identified source or originating from a new source if the difference ratio is above a threshold, wherein the first source is an identified source. - View Dependent Claims (54, 55, 56, 57)
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Specification