Patent Number: 8,218,884

Title: Image compression apparatus and image expansion apparatus

Abstract: An image compression apparatus includes: a dividing section for dividing an image to be compressed into blocks, each of which has a predetermined number of pixels having respective gradation values; a determining section for determining whether the block is a first kind block, in which a number of kinds of gradation values of the predetermined number of pixels belonging to the block is not greater than N (where N is an integer which is equal to 2 or greater) for each block divided and obtained by the dividing section; and a normalizing section which generates one of a first kind compressed data and a second kind of compressed data depending on the result of the determination.

Inventors: Suzuki; Takayuki (Machida, JP)

Assignee: Konica Minolta Business Technologies, Inc.

International Classification: G06K 9/36 (20060101)

Expiration Date: 2020-07-10 0:00:00