Image processing device and method

An image processing method using an image processing device, the image processing method comprising:

• a selecting step of searching for a minimum value of an index of a reference picture type different from the reference picture type of a current picture in units of pictures and selecting a plurality of reference pictures having mutually-different reference picture types from reference pictures represented by reference picture specifying information included in a reference list only in a case where the reference list that is a list of reference picture specifying information specifying reference pictures of the current picture is used commonly within the current picture;
• and
• a predicted image generating step of generating a predicted image of the current picture based on a motion vector of a collocated picture of time different from that of the current picture and a reference picture of a same reference picture type as a reference picture type of the collocated picture among the plurality of reference pictures selected in the process of the selecting step.