| 摘要 |
PURPOSE:To prevent images from being deteriorated in quality by executing the interpolation processing of multivalue data such as color images. CONSTITUTION:Plural reference tables 2 for storing information specifying which peripheral picture element is selected in each fine area obtained by subdividing a distance between picture elements are prepared in accordance with the combination of peripheral picture element information. Every calculation of a coordinate point of each picture element in a transferred area, a corresponding transferred fine area is calculated, the information of respective picture element points around the fine area is converted into binary information and the reference table 22 corresponding to the combination of the peripheral points is selected. Information for specifying which peripheral picture element is to be selected correspondingly to the fine area is read out and the arithmetic processing of the transferred picture element data is executed by using the peripheral picture element data selected by the information. Consequently, interpolation processing at the time of executing the expanding/contracting processing of characters or graphics expressed by color data can be rapidly executed. |
