Image processor

An image processor configured to compress a still picture with a configuration including a block having a plurality of pixels, a group of blocks having a plurality of blocks, and a frame having a plurality of groups of blocks, the image processor comprising:

• a first data storage configured to sequentially store a group of blocks;
• a compression unit configured to compress a group of blocks to be compressed stored in the first data storage;
• an analyzing unit configured to analyze the group of blocks to be compressed, and a second data storage configured to store a plurality of groups of blocks sequentially compressed by the compression unit to store a compressed frame,
• the analyzing unit being configured to set a first threshold on the basis of a target compression ratio of a frame, and
• the compression unit being configured to compress, among the group of blocks to be compressed, a block having an attribute value larger than or equal to the first threshold by applying a first compression format, and a block having an attribute value smaller than the first threshold by applying a second compression format having a higher compression ratio than the first compression format.