System for enlarging and smoothing textual characters

A method of enlarging a character that is represented by a first pattern of pixels, comprising the following steps:

• converting pixels of the first pattern to corresponding rectangles of pixels in a second pattern of pixels;
• identifying acute right angles in the first pattern, each such acute right angle having horizontal and vertical edges with corresponding lengths, each acute right angle in the first pattern having a corresponding right angle in the second pattern;
• determining the lengths of the horizontal and vertical edges of the acute right angles in the first pattern;
• for each identified acute right angle in the first pattern, identifying neighboring right angles in the first pattern, the neighboring right angles having horizontal and vertical edges with corresponding lengths;
• determining the lengths of the horizontal and vertical edges of the neighboring right angles in the first pattern;
• choosing whether to smooth a particular right angle in the second pattern based on the lengths of the horizontal and vertical edges of the corresponding acute right angle in the first pattern and based on the lengths of the horizontal and vertical edges of the neighboring right angles in the first pattern.

A method of enlarging a character that is represented by a first pattern of pixels, comprising the following steps:

• converting pixels of the first pattern to corresponding rectangles of pixels in a second pattern of pixels;
• sequentially checking individual pixels of the first pattern to determine whether they form acute right angles, each acute right angle in the first pattern having a corresponding right angle in the second pattern;
• classifying each acute right angle in the first pattern in terms of its orientation;
• identifying horizontal and vertical edges associated with the acute right angles using steps that depend on the classifications of the acute right angles, the horizontal and vertical edges having corresponding lengths;
• determining the lengths of the horizontal and vertical edges of the acute right angles in the first pattern using steps that depend on the classifications of the acute right angles;
• smoothing a particular right angle in the second pattern only if the horizontal and vertical edges of the corresponding acute right angle in the first pattern have lengths that are less than predetermined values.