Television – Image signal processing circuitry specific to television – Motion vector generation
Patent
1996-12-04
1999-05-18
Britton, Howard
Television
Image signal processing circuitry specific to television
Motion vector generation
348416, 348402, 348407, 348413, H04N7/32
Patent
active
059055421
ABSTRACT:
Methods and apparatus for performing dual prime motion estimation on video fields or frames of a video signal. A 16.times.16 motion estimator generates a same-parity match vector M.sub.-- SP and an opposite-parity match vector M.sub.-- OP for a current macroblock of a current field using a reference macroblock from each of a previous same-parity and opposite-parity field. A dual prime motion estimator receives the M.sub.-- SP and M.sub.-- OP match vectors for the current macroblock, and generates a base motion vector MV and a delta motion vector DMV for the current macroblock. In a first embodiment, the dual prime motion estimator generates MV and DMV by setting MV equal to M.sub.-- SP and then selecting DMV such that the opposite-parity vector OPV to be computed by a decoder is as close as possible to M.sub.-- OP. In a second embodiment, OPV is set equal to M.sub.-- OP and MV and DMV are selected such that MV is as close as possible to the same-parity match vector M.sub.-- SP. In a third embodiment, the dual prime motion estimator uses error measurements between the current macroblock and the same-parity and opposite-parity macroblocks to determine whether the techniques of the first embodiment or the second embodiment should be applied to the current macroblock.
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Ishihara et al, "A Half-pel Precision MPEG2 Motion-Estimation Processor with Concurrent Three-Vector Search", IEEE Journal of Solid-State Circuits, vol. 30, No. 12, pp. 1502-1509, Dec. 1995.
Britton Howard
C-Cube Microsystems Inc.
Le Vu
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