| 摘要 |
An image signal processing apparatus has a CCD for reading an image, a peak detector circuit for detecting a peak value of changes in an analog image signal received from the CCD, a slice level memory circuit for storing a fixed slice level, a comparator, and a slice level change circuit for setting a proper slice level for the image signal. Thickening of a character image or the like is prevented, allowing satisfactory readout of a microfilm image.
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