Patent ID: 9614888
Date: 2017-04-04
CPC Classifications: H04L,H04N

Claim:
1. A picture decoding device that decodes a bitstream in which differential information between a picture that is a decoding target and a picture that is a prediction target is partitioned into a plurality of sub blocks, and the partitioned sub blocks are coded in a predetermined sequence, the picture decoding device comprising: a context deriver that derives a context used for decoding differential coefficients in a decoding sub block that is a decoding target using significant sub block information of a decoded sub block that is neighboring the decoding sub block in a horizontal direction and the significant sub block information of a decoded sub block that is neighboring the decoding sub block in a vertical direction; a significant sub block information decoder that decodes the significant sub block information that represents whether or not all values of differential coefficients belonging to a sub block are zero using the context derived by the context deriver; a significant differential coefficient information decoder that decodes significant differential coefficient information that represents whether or not a value of the differential coefficients is zero using the context derived by the context deriver; and a differential coefficient value decoder that decodes the value of the differential coefficients.