IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE, IMAGE ENCODING METHOD, AND IMAGE DECODING METHOD.

摘要

Disclosed is an image encoding device which is provided with: a prediction unit (4) for adaptively determining the size of a motion prediction unit block in accordance with color component signals, and dividing the motion prediction unit block into motion vector allocation areas to search for a motion vector; and a variable-length encoding unit (8) for performing encoding in an mc_skip mode if a motion vector is equal to a prediction vector, and a prediction error signal (5) is not present when the motion vector is allocated to the entire motion prediction unit block, and for performing the encoding in a sub_mc_skip mode if the motion vector is equal to the prediction vector, and the prediction error signal(5) is not present when the motion vector allocation areas are not less than predetermined size, and the motion vector is allocated to the entire motion vector allocation area.