| 摘要 |
A method of detecting a designated image area from plural image areas included in a frame of a microfilm which is read by an image sensor through scanning operation. The method includes the steps of detecting plural image areas included in the frame, extracting the image area which contains a pre-set position in the frame, and then obtaining and storing the addresses which define the periphery of the designated image area. Also provided is an image area detecting device which comprises an image area detecting circuit for detecting plural image areas contained in the frame, a latch circuit for determining the designated image area including a pre-set position in the frame, memory for storing the addresses of the periphery of the designated image area, and a mask for extracting the designated image area defined by the thus stored addresses.
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