| 摘要 |
Methods and apparatus for performing dual prime motion estimation on video fields or frames of a video signal. A 16x16 motion estimator generates a same-parity match vector M-SP and an opposite-parity match vector M-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-SP and M-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-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-OP. In a second embodiment, OPV is set equal to M-OP and MV and DMV are selected such that MV is as close as possible to the same-parity match vector M-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.
|
