| 摘要 |
An image signal processing apparatus has an optical system including an image sensor, a comparator for comparing the density level of a current line with that of a previous line as a predicted value, a CPU for determining a threshold level in a different mode in accordance with the result obtained by the comparator, and another comparator for comparing the current image signal with the threshold value from the CPU to produce a binary encoded signal. The apparatus properly discriminates background and information portions of an original image and performs binary encoding of image signals in real time without requiring a large-capacity memory.
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