| 摘要 |
PROBLEM TO BE SOLVED: To suppress an adverse influence of wrong detection of a document edge on postprocessing using a detection result with respect to an image reader. SOLUTION: This image reader pre-scans a partial area on a document table to read a lower area of a document placed on the document table, converts image data as a read result into edge image data, and extracts an edge point group corresponding to document edges from the data. Further, the extracted edge point group is linearly approximated to estimate a document area of the edge image data. Then the distance D1 from a data left end to the left side of the document and the distance D2 from a data lower end to the lower side of the document area are calculated (S910, S930), and when the distances D1 and D2 are both less than a threshold, it is evaluated that the accuracy of the estimated document area is high (S950), but when not, it is estimated that the accuracy is low (S980). When it is evaluated that the accuracy si low, it is estimated that the size of the document placed on the document table is a predetermined basic size (S990). COPYRIGHT: (C)2009,JPO&INPIT
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