| 摘要 |
PROBLEM TO BE SOLVED: To provide an image reading apparatus for detecting the size of an original image to be read with a simple circuit configuration. SOLUTION: An extract section 39 extracts e.g., G components from image data of one line adopting the RGB color system read by a CCD line sensor 35. The extracted G components for one line are divided into component divisions each comprising a plurality of number of data, and an average value calculation section 40 calculates an average value of the G components in each division. Further, a difference calculation section 41 calculates a difference between the average values adjacent to each other among the calculated average values in one line and a size decision section 42 detects the size of the original on the basis of the calculated difference value. COPYRIGHT: (C)2004,JPO
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