| 摘要 |
PURPOSE:To prevent deterioration in picture quality by performing a feature extraction with a feature extraction means before a correction with a correction means. CONSTITUTION:The picture data of an original 1 read from a photoelectric transducer 4 is converted to a digital picture data with an A/D converter 5. An edge enhancement circuit 6 is provided at the front of a shading correction circuit 7, and when an edge is enhanced, a result that the edge enhancement of the picture data is performed, produces the picture data without a unique output, because the original with uniform density is read in. Next, at the shading correction circuit 7, the unevenness of the digital picture data due to the unevenness in the light quantity of an original illumination lamp 2 is corrected. By enhancing the edge before a shading correction, the unevenness in the digital picture data due to the unevenness in the light quantity in the original illumination lamp 2 is shading-corrected, and the edge, such as a thin line, a thin pattern, or the outline of an image, etc. is enhanced.
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