| 摘要 |
An original reading apparatus has a reader and a printer. When original signals of a unit detection region of, for example, 4 bits (main scanning direction )x4 lines (subscanning direction) continuously represent a white region, an original is detected. Latch circuits latch original signals corresponding to four corners of an original, and AND gates calculate the AND products of these signals with corresponding data stored in RAMs to determine the original region.
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