| 摘要 |
PROBLEM TO BE SOLVED: To provide a white reference value reading method capable of obtaining an excellent white reference value regardless of the size of foreign matter that may adhere to a white reference plate, and method for detecting and correcting the foreign matter regarding an image reading apparatus and an image processing method. SOLUTION: In an image reading apparatus 1, the invention provides a method for detecting foreign matter which may adhere to a white reference plate 12, and correcting a reference value when foreign matter is detected. The method includes computing an average of read values, comparing an absolute value of difference between the computed average value and data of the next read position to a predetermined threshold, and when a judging unit judges that foreign matter adheres to the reference plate, replacing the average value used for the judgement of whether or not the foreign matter adheres to the reference plate with the read data. COPYRIGHT: (C)2006,JPO&NCIPI
|
