| 摘要 |
PROBLEM TO BE SOLVED: To provide an image compression apparatus which generates an excellent decoded image without degrading image quality of a compression object, and also to provide an image expansion apparatus, a method for them, and a program. SOLUTION: A binary section 102 binarizes a multi-value image 101. An area particularizing section A104 particularizes a position of a character area in a binary image 103. An area particularizing section B105 particularizes a position of a unit character area in the character area. A representative color part extract section 110 extracts a representative color of the unit character area on the basis of position information of the unit character area and the multi-value image 101. A character area filling-in section 113 fills in the character area by its peripheral color on the basis of the position information of the character area. A reduction section 114 reduces a filling-in multi-value image. A JPEG compression section 115 compresses reduced multilevel image an MMR compression section compresses a partial binary image corresponding to the character area. Compression data 117 including the position information, compression codes generated by each compression section, and representative color information of the unit character area are outputted. COPYRIGHT: (C)2004,JPO
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