| 摘要 |
This invention relates to improvements in selecting prediction parameters, particularly in relation to, but not exclusively to, selecting motion vectors in the compression of digital video signals. This invention provides a method and apparatus for generating a compressed output digital signal 16 by using temporal compression. The output digital signal 16, includes prediction parameters, e.g. motion vectors in digital video compression. An initial estimate is made for each of the prediction parameters and stored in a buffer 31. The prediction parameters are updated recursively 32 with reference to other prediction parameters. One advantage of this method is that the prediction parameter estimates 34 are more robust to noise. This avoids the situation where small advantages in picture quality are outweighed by a larger codeword. The output signal 16 can therefore be transmitted using less bandwidth.
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