| 摘要 |
An image reading apparatus that reads color images by means of scanning the document surface with CCD sensors that correspond to red (R), green (G) and blue (B) colors respectively, comprising: a diagonal line pattern 4 provided within the CCD sensors' reading ranges; a color shift correction factor arithmetic unit 40 that detects color shifts from the data obtained by reading the diagonal line pattern and calculates correction factors; and a correction arithmetic unit 42 that corrects the document image data for each color component read in the previous step using the calculated correction factors.
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