| 摘要 |
An image reading apparatus which reads document surface of open book-like document placed on a document platen in a face upward condition and detects height of the document. An image reader reads the document to output image data. A first detector detects a background luminance of the document in accordance with the image data. A second detector detects a height of document. A first determining device determines a background luminance distribution based on the background luminance of the document detected by the first detector. A second determining device determines a height distribution based on the height of document detected by the second detector. A first anomalies detector detects anomalies of the background luminance distribution. A second anomalies detector detects anomalies of the height distribution. A convertor converts the height distribution and the background luminance distribution each other. An interpolator interpolates each anomalies of the distributions using the other distribution converted by convertor. An warning device warns an impossibility of reading, when the interpolating is impossible.
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