| 摘要 |
This invention concerns the correction of errors arising from defective composite colour processing in video signals or data derived from a coding method using periodic phase reversal of a colour difference signal. Sets of colour difference values from reversed and un-reversed parts of an image are used to derive a statistical estimate of composite decoding demodulation phase error. The estimated phase error can be used to modify the demodulation phase of a composite decoder, or can be used to perform a rotational transform to correct the phase error. A luminance value associated with each said set of colour difference values may additionally be used to correct differential phase distortion. |
