| 摘要 |
In analogue television systems, it is known to compensate for the receiver-end luminance defects which are caused by transmitter-end low-pass filtering of the gamma-predistorted chrominance signals, with the aid of transmitter-end correction signals. This method for luminance correction can also be used in connection with modern picture coding methods such as e.g. MPEG. To that end, the chrominance is encoded and decoded again in the encoder. A correction signal is derived from the decoded chrominance signal and is used during the encoding of the luminance. The macroblocks which are motion-compensated for prediction are based on the correspondingly decoded chrominance signal and on the decoded, corrected luminance signal. |
