Patent ID: 9743101
Date: 2017-08-22
CPC Classifications: H04N

Claim:
1. A picture coding device that partitions difference information between a picture serving as a coding target and a picture serving as a prediction target into a plurality of sub blocks, and codes partitioned sub blocks in a certain order, the picture coding device comprising: a significant sub block information encoder that codes significant sub block information indicating whether or not all values of difference coefficients belonging to a sub block serving as a coding target are zero; a significant difference coefficient information encoder that codes significant difference coefficient information indicating whether or not value of a difference coefficient is zero; a difference coefficient value encoder that codes the value of the difference coefficient; and a context deriver that derives a context for coding the significant difference coefficient information of difference coefficient serving as the coding target based on sum of horizontal position and vertical position of the difference coefficient in sub block serving as the coding target, and at least one of (1) the significant sub block information of coded sub blocks neighboring to the sub block serving as the coding target, (2) the significant difference coefficient information of difference coefficients belonging to coded sub blocks neighboring to the sub block serving as the coding target, or (3) values of difference coefficients belonging to coded sub blocks neighboring to the sub block serving as the coding target.