| 摘要 |
<p>In a method of recognizing a pattern of a halftone image of a first invention, a halftone image to be processed is subjected to a normalization process (3), local halftone feature parameters are extracted (4, 7, 8, 9) from the normalized image at its sampling points, and the pattern is identified (5) by using the extracted feature parameters in accordance with a predetermined recognition procedure. An apparatus for recognizing a pattern of a halftone image of a second invention, comprises a memory (211) for storing a halftone image having several brightness tone levels, a normalization circuit (3, 212 - 216) for normalizing the brightness of the halftone image to be processed, an extraction circuit (4, 212 - 216) for extracting local halftone feature parameters from the obtained normalized image at specific points, and a recognition circuit (5) for identifying the pattern by using the feature parameters in accordance with a predetermined recognition procedure.</p> |
