| 摘要 |
PROBLEM TO BE SOLVED: To enhance the accuracy of detection of noises caused in an image due to dust existing on an original platen. SOLUTION: The image reading apparatus includes: three line sensors including filters whose spectral sensitivity differs from each other, arranged at an interval in the subscanning direction and scanning an original in the subscanning direction; the original platen provided between the original and the three line sensors; a moving mechanism for moving the original platen at a relative speed different from a relative speed between an original and the three line sensors; a noise pixel detection processing section for detecting a noise pixel respectively from three data output from the three line sensors; a color detection section for detecting colors of each noise pixel from the three data; and a judgment section (S05, S08, S11) for validating a detection result by the noise pixel detection processing section when the color of the noise pixel and colors of pixels around the noise pixel take a predetermined combination. COPYRIGHT: (C)2006,JPO&NCIPI |
