Patent ID: 7961191

Claim:
An outline font brightness value correction system correcting a brightness value of a pixel for preventing a half tone from being regarded as a blot when a character of an outline font form is displayed in a grayscale, the outline font brightness value correction system comprising: a pre-correction outline font data storage unit configured to store pre-correction outline font character data; a brightness value pattern data storage unit configured to store data of a combination of a pre-correction brightness value pattern with a post-correction brightness value pattern; an outline font data readout unit configured to read the pre-correction outline font character data from the pre-correction outline font data storage unit and to determine a correction subject pixel that requires a correction of a brightness value of a pixel related to a contour line included in the pre-correction outline font character data; and a correction data calculation unit configured to search a brightness value pattern similar to a pre-provided pre-correction brightness value pattern related to a brightness value pattern of the correction subject pixel and that of surrounding pixel thereof, to list up candidates for a post-correction brightness value pattern of an appropriate value as a post-correction brightness value from the combinations of the pre-correction brightness value pattern with the post-correction brightness value pattern related to a similar brightness value pattern, to derive a post-correction brightness value pattern uniquely from candidates for a post-correction brightness value pattern of the entirety of correction subject pixels of listed characters, and to determine an optimal post-correction brightness value in consideration of information on the contour line from a range of post-correction brightness values of each pixels of the derived unique post-correction brightness value pattern.