| 摘要 |
PURPOSE:To convert a forecasting order based upon the statistical quantity of a picture and to improve data compressibility by executing encoding for forecasting order conversion only when the difference between a standard reference level and a reference picture element selected from a picture element is included in a set up level range. CONSTITUTION:The level of a picture element transmitted immediately before a transmitted remarkable picture element is compensated and operated by the level of a previously transmitted picture element to obtain a standard reference level. A combining picture element is selected from already transmitted picture elements as a reference picture element. When the level difference between the reference picture element level and the standard reference level is always included in a previously set up level range, only the level difference of each reference picture element from the standard reference level is referred. The order by which the level difference between the remarkable picture element and the standard reference level apears is forecasted, the level difference between a really formed remarkable picture element and the standard reference level is converted into the forecasted order and the forecasted order is encoded. If the level difference exceeds the set up range, different encoding is performed to improve the data compressibility. |
