Video image processing
AssigneeBritish Broadcasting Corporation
InventorsMichael Burl, Phillip Graham Layton
Life of this patent
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Abstract
A method of generating motion vectors from a video signal, for use in motion compensation, is applicable to interlaced video signals. In the method alternate video fields are shifted vertically so as to align the picture lines of interlaced fields, by moving the lines of one field up by half a picture line and the lines of the next field down by half a picture line. The fields of each resultant pair are compared to produce a set of motion vectors which can be used to motion compensate the video signal. The accuracy may be improved using temporal filters operative on correlation surfaces derived over tow or more field intervals.
Claims29
A method of deriving a set of motion vectors from a video signal comprising the steps of:
- receiving successive interlaced video fields of a video signal,
- receiving successive interlaced video fields of a video signal,
- deriving new lines of video data in the video fields, thereby producing pairs of fields whereby, in each pair of fields, the new lines in one field are substantially vertically aligned with the new lines in the other field,
- deriving a correlation surface by comparing, in each pair of fields, the new lines in one field with the new lines in the other field, and
- temporally filtering correlation surfaces derived over two or more field intervals to produce said set of motion vectors.
A system for deriving a set of motion vectors from a video signal comprising means for receiving successive interlaced video fields of a video signal, means for deriving new lines of video data in the video fields thereby producing pairs of fields having vertically substantially aligned picture lines, means for deriving a correlation surface from a pair of fields, and means for temporally filtering correlation surfaces derived over two or more field intervals to produce a set of motion vectors.
A method of generating a set of motion vectors from a video signal, comprising the steps of receiving successive interlaced video fields of a video signal, spatially filtering the lines of each field to produce pairs of fields having vertically substantially aligned picture lines, deriving a correlation surface from each pair of fields and temporally filtering correlation surfaces derived over two or more field intervals to produce a set of motion vectors.
Apparatus for generating a set of motion vector from a video signal, comprising means for receiving successive interlaced video fields of a video signal, means for spatially filtering the lines of each field to produce pairs of fields with vertically substantially aligned picture lines, means for deriving a correlation surface from each pair of fields and means for temporally filtering correlation surfaces derived over two or more field intervals to produce a set of motion vectors.
A method of deriving a set of motion vectors from a video signal comprising the steps of:
- receiving successive interlaced video fields of a video signal,
- deriving new lines of video data in the video fields thereby producing pairs of fields whereby, in each pair of fields, the new lines in one field are substantially vertically aligned with the new lines in the other field,
- the method further comprising, in each pair of fields, comparing the new lines in one field with the new lines in the other field to produce a set of motion vectors.
A method of deriving a set of motion vectors from an interlaced video signal, the method comprising:
- receiving successive interlaced video fields,
- deriving new lines of video data to produce pairs of fields having substantially the same number of lines of video data as the input fields but wherein the lines of video data in each pair of fields are substantially vertically aligned, and
- comparing the substantially aligned video lines to produce a set of motion vectors.
Dependencies are inferred from the claim text.