DATA STORAGE CONTROL APPARATUS AND DATA STORAGE CONTROL METHOD

摘要

A compressed data generator compresses, by using a lossless compressor and a lossy compressor, image data in units of first blocks to generate a plurality of types of compressed data. A selector performs selection processing in units of second blocks each including a predetermined number N of first blocks, where N is an integer of 1 or more. The selection processing involves determining whether each of the plurality of types of compressed data satisfies a selection condition and selecting one piece of compressed data that satisfies the selection condition. The selection condition includes a data size condition that a data size of all the first blocks included in the second block is less than or equal to a predetermined value, and a data accuracy condition that information maintaining accuracy is highest among compressed data that satisfy the data size condition.

主权项

1. A data storage control apparatus comprising:
a compressor that compresses image data and outputs compressed data; and a writing controller that writes said compressed data as write data to a memory, wherein said compressor includes: a compressed data generator that includes a lossless compressor for performing lossless compression and a lossy compressor for performing lossy compression, and that compresses, by using said lossless compressor and said lossy compressor, said image data in units of first blocks, each being an image block of a predetermined area size, to generate a plurality of types of compressed data in parallel or in series; and a selector that performs selection processing on each second block that includes a predetermined number N of said first blocks, where N is an integer of 1 or more, said selection processing involving determining whether each of said plurality of types of compressed data generated by said compressed data generator satisfies a predetermined selection condition and selecting one piece of compressed data that satisfies said predetermined selection condition, said predetermined selection condition includes: a data size condition that a data size of all of said first blocks included in said second block is less than or equal to a predetermined value; and a data accuracy condition that information maintaining accuracy is highest among said compressed data that satisfies said data size condition, and said writing controller writes said one piece of compressed data selected by said selector as said write data to said memory.