| 摘要 |
The present invention relates to an image reader well suited for reading for reading bound documents such books and magazines, the image reader comprises a document table to support a document to be read, an image sensor to convert a document image to electrical signals, and a signal processing unit to quantize and output said electrical signals to external devices. The signal processing unit is constructed so as to be capable of reading the edge surfaces in a direction perpendicular to the lateral direction of a document in an open-faced state and is provided with a size detector to detect the document edge positions on bilateral sides of the open-faced document in a lateral direction, a page size calculator to calculate the length of one page in a lateral direction of said open-faced document based on the read information of the edge surfaces and document edge position detected by said document size detector, and output range setting device to set the image output range in accordance with the length of one page calculated by the page size calculator.
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