| 摘要 |
PURPOSE:To improve an estimating precision, and to make a restored picture satisfactory at the time of estimating an important word by using peripheral decoded data, when the important word generated at the time of a block coding is erroneous. CONSTITUTION:Peripheral data (yi) being a decoded value from a first ADRC decoder 31 related with a block in which the important word is not erroneous, and a coded value (xi) related with the block under consideration of the error, are taken out from a memory 34. An arithmetic circuit 36 estimates important words DR and MIN by the method of least square by using the (xi) and (yi). Only the (xi) and (yi) which are not erroneous are used by the arithmetic circuit 36. The maximum value DR' of the (xi) is detected by a detecting circuit 12, and when it is less than 2<n>-1, the DR' is selected by a selector 37 instead of DR from the arithmetic circuit 36. |
