PICTURE CODING APPARATUS

摘要

Any type of media data can be played back on a receiving side regardless of quality conditions of a data transmission line. Therefore, in a differential motion vector limiting unit 10, the number of cases of the inputting of "1" as quality conditions 9 of a data transmission line is counted and held for each unit time by using an internal timer. In simultaneous with the holding of the counted number, a differential motion vector limiting unit 10 refers to the counted number according to input position information 22 of a to-be-coded macro-block for each picture, and differential motion vector limiting information 11 is determined according to the referred counted number. In a motion compensation predicting unit 12, a differential motion vector is calculated, and the differential motion vector is compared with the differential motion vector limiting information 11. In cases where the calculated differential motion vector is beyond the differential motion vector limiting information 11, the differential motion vector is replaced with the differential motion vector limiting information 11 to set a limit to the differential motion vector, and the motion vector 21 is output to a VLC unit 20. <IMAGE>