Grayscale shared data generating device, Grayscale shared data restoring device, Grayscale data processing device, Grayscale shared data generating method, Grayscale shared data restoring method, Grayscale data processing method and computer readable recording medium

摘要

The gradation sharing data generating apparatus shares plural kinds of gradation data for representing a symbol in accordance with a predetermined number of pixels indicating gradation from contour information representing the outline of a symbol including a character or a figure, and generates gradation sharing data. A gradation shared data generating device comprising: an outline information expansion and contraction unit (102), a basic gradation value calculation unit (103), and a generated gradation number for generating gradation data of gradation number 2 and gradation data of gradation number 3 from contour information; A gradation shared data generation unit 105 for generating gradation shared data of gradation number 4 from gradation data of 2 and gradation data of gradation number 3 is provided.;The gradation shared data restoring apparatus is a gradation shared data restoring apparatus for restoring gradation data from the gradation sharing data, and includes a gradation number selector 108 for selecting gradation number 2 or gradation number 3, and selecting from the gradation sharing data. Therefore, the first gray scale data restoration unit 109 restores the gray scale data of the gray scale number 2, and the second gray data restoration unit 110 restores the gray scale data of the gray scale number 3.