| 摘要 |
<p>An object of the present invention is to provide an image processing apparatus capable of correctly detecting character boundaries and outputting a binary image that is expressed in such a manner as to be closer to the original image. A current subject pixel (11) is judged as being of a character edge when the difference between a maximum value Qmax and a minimum value Qmin of the densities of five pixels that are the subject pixel (11) and four reference pixels (12) that are located on top-right, bottom-right, top-left, and bottom-left of the subject pixel (11) is greater than a predetermined threshold value Te, that is, Qmax - Qmin > Te. For each of input images having different halftone dot pitches, a user can select an optimum one of judging means with different distances between the subject pixel (11) and the reference pixels (12). <IMAGE> <IMAGE></p> |
