Information processing device, image modification method, and computer program product

An image modification method comprising:

• acquiring an image;
• dividing the image into a text containing region containing one or more characters and a background region other than the text containing region;
• dividing the text containing region into a character region constituted by lines forming the characters and a character background region other than the character region;
• calculating a first representative value of a predetermined attribute of the character region, a second representative value of the predetermined attribute of the character background region, and a third representative value of the predetermined attribute of the background region;
• modifying at least one of the first representative value, the second representative value, and the third representative value in such a way that a first difference based on the first representative value and the third representative value, a second difference based on the first representative value and the second representative value, and a third difference based on the second representative value and the third representative value become larger;
• and
• outputting a modified image obtained by
• changing the value of the predetermined attribute of the character region to a modified first representative value when the first representative value is modified,
• changing the value of the predetermined attribute of the character background region to a modified second representative value when the second representative value is modified, or
• changing the value of the predetermined attribute of the background region to a modified third representative value when the third representative value is modified.

A computer program product comprising a computer-readable medium containing programmed instructions, the instructions causing a computer to execute:

• acquiring an image;
• dividing the image into a text containing region containing one or more characters and a background region other than the text containing region;
• dividing the text containing region into a character region constituted by lines forming the characters and a character background region other than the character region;
• calculating a first representative value of a predetermined attribute of the character region, a second representative value of the predetermined attribute of the character background region, and a third representative value of the predetermined attribute of the background region;
• modifying at least one of the first representative value, the second representative value, and the third representative value in such a way that a first difference based on the first representative value and the third representative value, a second difference based on the first representative value and the second representative value, and a third difference based on the second representative value and the third representative value become larger;
• and
• outputting a modified image obtained by
• changing the value of the predetermined attribute of the character region to a modified first representative value when the first representative value is modified,
• changing the value of the predetermined attribute of the character background region to a modified second representative value when the second representative value is modified, or
• changing the value of the predetermined attribute of the background region to a modified third representative value when the third representative value is modified.