Image encoding device, image decoding device and non-transitory memory medium

Abstract

The image encoding apparatus performs the following processes: writing a first parameter into a bitstream, the first parameter being a segmentation pattern identified from a plurality of segmentation patterns for dividing a first block into sub-blocks; when it has been determined that a second segmentation pattern is to be selected as a candidate for dividing the second block, selecting a segmentation pattern from a plurality of segmentation patterns including the second segmentation pattern as a candidate, and writing a second parameter displaying the selection result into a bitstream; when it has been determined that a second segmentation pattern is not to be selected as a candidate for dividing the second block, selecting a segmentation pattern, wherein the segmentation pattern divides the block into sub-blocks, the sub-blocks being compared with the sub-blocks generated by the second segmentation pattern to be of different shapes or different sizes; using the selected segmentation pattern to divide the second block into sub-blocks; and encoding the segmented blocks.

Images