DATA COMPRESSING METHOD, DATA RESTORING METHOD, AND DATA COMPRESSING/RESTORING METHOD

摘要

PURPOSE:To efficiently compress objective data to be compressed by removing redundancy the objective data has. CONSTITUTION:The probability of the occurrence of the logical value of a corresponding bit classified by each one or plural bits on condition of the combination of the logical value of other prescribed one or plural bits is determined beforehand by the probability calculating part 12 of a preprocessing part 10 based on the unit data inputted up till the last time, and each prescribed one or plural bits of the unit data inputted this time are outputted to an encoding part 16 after being replaced so as to be '0' when the conditional logic occurrence probability of the corresponding bit is large and '1' when it is small by a bit replacing part 14.