JPH0747336B

PURPOSE:To make possible the enlargement of a high-quality character pattern even if the vertical and horizontal magnifications differ, by installing a dot enlargement section, a peripheral 8-bit storage device, an interposed identification pattern judgement device, an interposed pattern calculation device and an interposed pattern storage device in a character enlargement section. CONSTITUTION:One bit is read from an original character pattern and this bit is enlarged to be stored in a pattern buffer during the correction of enlarged characters. Then peripheral 8 bits are stored in an interposition judgement register. Next, if the one bit which is read represents a black color, the content of the interposition judgement register is compared to interposition judgement data 1. If the one bit represents a white color, the content of the interposition judgement register is compared with interposition judgement data 2. Then, if some of the data coincides with the latter, it is checked whether the ratio of vertical and horizontal magnifications is 1:1. If the ratio is not 1:1, the data is subjected to interposition processing 2,4. In the interposition processing 2, 4, an interposition start position and an interposition count are calculated, and further the calculated interposition pattern data is stored in a pattern buffer twice. in succession. After this, an updated value is subtracted from the interposition pattern data to decrement the interposition count. If the interposition count is not O, the interposition pattern data is subjected to a repeated processing starting with its storage.