| 摘要 |
After an original image, including half-tone dot meshed characters is inputted and a prescribed process is applied to the original image, black pixel connected patterns are extracted from a target process area. If the density of the extracted pattern exceeds a prescribed density, it is judged that the pattern is half-tone dot meshed and both the respective average values and standard deviations of the vertical/horizontal sizes of the connected pattern are calculated. Then, respective threshold values are calculated based on both the respective average values and standard deviations, and half-tone dots are eliminated. Then, a pattern, the outline of which is long compared with an included black pixel, out of the remaining connection patterns is eliminated as an unnecessary pattern. Lastly, projections attached to a character are deleted and character extraction is terminated. <IMAGE> |
