| 摘要 |
<p>PURPOSE:To effciently execute entropy encoding and to improve the encoding compression rate of natural picture data by executing exclusive OR processing between a noticed picture element and its adjacent picture element on the prestage of entropy encoding. CONSTITUTION:Picture data PA from a picture input part 1 are applied to a bit plane developing part 2 and decomposed to a bit plane, which is stored in a picture memory 3. An exclusive OR operation part 4 forms exclusive OR between the picture data of each picture element position in the picture data of each bit plane stored in the memory 3 and that of an adjacent picture element adjacent to the preceding position of the picture element position concerned in a main scanning direction while using the contents of a work memory 5. The processed result is applied to a run length encoding processing part 6 as picture data PB. The processing part 6 applies prescribed run length encoding processing to the data PB to execute compression encoding and outputs encoded data CDa. Since entropy is reduced prior to encoding, the efficiency of encoding can be improved.</p> |
