| 摘要 |
PURPOSE:To eliminate erroneous recognition, by detecting an original sequentially within the range after detecting maximum length in a horizontal and a vertical directions, and outputting a picture signal only within the range of the original. CONSTITUTION:When points from (x1,y1) to (x4, y4) are recognized by a first reciprocal movement of an optical system, the coordinate information of the points are informed to a CPU310. Following the above, a second scan operation is performed. The part of an output image is calculated based on the bit of original detecting information in a main scan direction of a preceding line at every eight lines, and by controlling a gate circuit 304 according to a calculated result, the output of a bit of picture information in the original can be controlled. After completing recognition scan, an original recognition data is loaded from an original detection circuit, At this time, the coordinate data of four points are recognized by the CPU310. It is possible to judge the correctness of the recognition data and to attain the detection of a satisfactory position in regular scan from the data obtained the recognition scan.
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