1. An image processing device comprising: circuitry configured to: set a candidate of a predictive vector by setting a co-located vector as unavailable as the candidate of the predictive vector for a coding vector in a current block of a current picture where a reference picture of the coding vector is of a different type of two reference picture types than a reference picture of the co-located vector, wherein the co-located vector is in a co-located block included in a co-located picture of a time different from the current picture but of a same view as the current picture, and wherein the two reference picture types comprise a long-term reference picture type and a short-term reference picture type; generate the predictive vector in the current block according to the candidate of the predictive vector; and encode a difference vector between the coding vector and the generated predictive vector.