| 摘要 |
<p>The present invention describes processes for encoding an information signal that are useful to reduce the bandwidth of, or improve the perceived quality of, that signal as transmitted and displayed. The techniques utilize time-varying sampling schemes and take into account the characteristics of the human visual system. For each information frame, a subset of all possible data points (3) is selected. A further subset of active data points (5) is selected for which data will actually be sampled. The active points are further divided into points for which a value will be transmitted [x-points] (7) and points which will be sampled but for which no separate value will be transmitted [o-points] (8). A mathematical association between the x-points and o-points is made and new values (10) to be transmitted are calculated for the x-points. The parameters of the selection and association processes are varied in a non-trivial manner and the entire cycle repeated for subsequent data frames. In particular, the techniques may be used to transmit a high-definition television signal over a low-bandwidth channel.</p> |
