| 摘要 |
<p>PURPOSE:To improve the clearness of a boundary line by providing an input picture memory, plural coding picture element registers, a predicting value calculator, plural data compressors, a comparator and a selector so as to decrease the section of fog near the picture boundary line. CONSTITUTION:An input picture stored in a memory 1 is extracted sequentially, stored in a register 3 as a coded picture element B, when a new value is stored in the register 3, the picture is transferred to a register 2. Then a data compressor 5 obtains a difference between outputs of the register 2 and the predicting value calculator 4, converts it into a transmission value, coded and outputted as a code A. Moreover, a data compressor 6 obtains a difference of outputs of the register 3 and the calculator 4, converts the result into a transmission value and coded and outputted as a code B. The value A is inputted to a comparator 7, compared with a fixed value from a signal line 9, the signal being the result of comparison is outputted to a selector 8, the selector 8 selects either the value A or the value B and gives an output to a signal line 10 as the code output. Thus, the section of fog near the boundary line is decreased to improve the clearness of the boundary line.</p> |
