Image forming apparatus having illumination direction altered fo

Details Image forming apparatus having illumination direction altered fo Image forming apparatus having illumination direction altered fo

1994-04-19

1997-03-04

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Scanning

358509, 358461, 358474, 358475, H04N 104, H04N 148

Patent

active

056085478

ABSTRACT:
In a shadow process mode, a scanner reads out an original with a first exposure lamp in a first scanning operation. The readout image data is stored in an image memory via an I/O control unit. In the second scanning operation, the scanner reads out the original with a second exposure lamp having an illumination direction different from that of the first exposure lamp. The image data read out in the second scanning operation and the data stored in the image memory are subtracted for each pixel by a subtractor. The difference thereof is compared with a predetermined value in a comparator. The compared result is output to a selector, whereby a desired image data is provided to a printer processing unit via the I/O control unit.

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patent: 5408268 (1995-04-01), Shipp

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