| 摘要 |
PROBLEM TO BE SOLVED: To secure satisfactory images in every area, e.g. an image having its clearly emphasized edges in a character area, etc., even with an original where the character, photo and halftone dot areas coexist by performing the θcorrection processing and the digital filter processing to the input image data. SOLUTION: The image of a reading original 1 is formed on an image sensor 3 via a lens system 2 whose focus, etc., are previously adjusted. The image signals fetched by the sensor 3 are amplified at an image amplifier part 4 and then converted into the digital signals via an A/D conversion part 5. These digital signals are inputted to an image processor 17. In such a constitution, the digital filter processing, i.e., the edge emphasis processing and the smoothing processing or the θ correction processing, i.e., the correction processing of density conversion into deep and light colors are carried out in the character, photo and halftone dot areas, respectively. Thus, the picture quality is improved for the input images. |
