Video processors
AssigneeQuantel Limited
InventorsRichard J. Taylor, Paul R. N. Kellar, Stephen P. Greenhalgh
Life of this patent
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Abstract
A video signal processor for effecting frame rate conversion. A number of framestores connected in series receive incoming video signals under the control of a first generator and are available from the respective fieldstores under the control of a second generator. The presence of respective one line delays allow two adjacent lines from the same field to be available for use by respective multipliers and thence to an adder. A comparator determines if significant movement is present and modifies co-efficients to the multipliers, made available from a co-efficient control so as to allow a single field to pass to the output if desired.
Claims6
A video signal processor for effecting field or frame rate conversion comprising:
- storage means having the capacity to store video signals in a plurality of incoming fields of television signals;
- input means for writing applied signals in said storage means at a first field rate to make video signals in a plurality of said incoming fields available for processing;
- processing means for deriving video signals from said storage means at a second and dissimilar field rate to generate a plurality of outgoing fields of video signals;
- said processing means having a first mode of operation in which the video signals forming an outgoing field are derived from video signals taken into said storage means from a single incoming field;
- said processing means having another mode of operation in which the video signals forming an outgoing field are derived by combining video signals taken into said storage means from a plurality of incoming fields;
- means for comparing video signals in different fields to indicate whether or not there was substantial movement in the televised scene;
- means for selecting the first mode of operation of said processing means in response to an indication of no substantial movement from said comparing means;
- and
- means for selecting the other mode of operation of said processing means in response to an indication of substantial movement from said comparing means.
A video signal processor for effecting scan rate conversion comprising:
- storage means having the capacity to store video signals in the plurality of area scans of a scene;
- input means for writing applied signals in said storage means at a first area scan rate to make video signals in a plurality of area scans available for processing;
- processing means for deriving video signals from said storage means at a second and dissimilar area scan rate to generate a plurality of outgoing area scans of video signals;
- said processing means having a first mode of operation in which the video signals forming an outgoing area scan are derived from video signals taken into said storage means from a single incoming area scan;
- said processing means having another mode of operation in which the video signals forming an outgoing area scan are derived by combining video signals taken into said storage means from a plurality of incoming area scans;
- means for comparing video signals in different area scans to indicate whether or not there was substantial movement in the scene;
- means for selecting the first mode of operation of said processing means in response to an indication of no substantial movement from said comparing means;
- and
- means for selecting the other mode of operation of said processing means in response to an indication of substantial movement from said comparing means.
A method of processing video signals for effecting field or frame rate conversion comprising:
- storing video signals incoming at a first field rate to make video signals in a plurality of incoming fields available for processing;
- deriving video signals from said storage means at a second and dissimilar field rate to generate a plurality of outgoing fields of video signals, in either of two modes;
- in one of which an outgoing field is derived from video signals stored from a single incoming field, and in the other of which an outgoing field is derived by combining video signals stored from a plurality of incoming fields;
- comparing video signals in different fields to indicate whether or not there was substantial movement in the scene;
- selecting said first mode of operation in response to an indication of no substantial movement from said comparison;
- and
- selecting said other mode of operation in response to an indication of substantial movement from said comparison.
Dependencies are inferred from the claim text.