| 摘要 |
Processing of digitally-coded pictures to improve perceived quality without increasing transmission channel capacity, featuring dividing the video signal into a low, middle and high frequency signals (16, 26), finely quantizing the low frequency signal (18), adding pseudo-random noise (33) to the middle frequency signal prior to quantizing (28), enhancing (36) and adding pseudo-random noise (48) prior to coarsely quantizing (50) the high frequency signal. The pseudo-random signals are subtracted (37, 52) from the respective signals at the receiver. |
