Image processor

An image processor comprising:

• a frequency inverse transform unit performing frequency inverse transform on a first pixel block as a target block;
• a post-filter performing postfiltering with a region which overlaps with plural unit regions for processing by the frequency inverse transform unit as a unit region for processing, after frequency inverse transform is performed;
• and
• a first memory unit externally connected to the post-filter,
• the post-filter performing postfiltering on a second pixel block being shifted from the first pixel block by a predetermined number of pixels each horizontally and vertically as a target block,
• said second pixel block being a plurality of second pixel blocks,
• the post-filter performing postfiltering sequentially on the plurality of second pixel blocks aligned in a vertical direction, wherein
• among a group of pixel signals of the first pixel block inputted from the frequency inverse transform unit to the post-filter, pixel signals of a row not overlapping with the second pixel block are stored in the first memory unit.