Image forming apparatus which adds identifying information to im

Details Image forming apparatus which adds identifying information to im Image forming apparatus which adds identifying information to im

1994-12-16

1998-02-17

Coles, Sr., Edward L.

Image analysis

Image segmentation

Distinguishing text from other regions

358455, 358456, 358462, H04N 140, H04N 1387, H04N 146

Patent

active

057199574

ABSTRACT:
In an image forming apparatus for forming a binarized image upon adding on additional information without degrading image quality, a mode signal assumes an "H" or "L" level. When the mode signal is at the "H" level, a pattern in which a binarized output attains the "H" level for two successive pixels appears in a low-density area of the image formed, thereby indicating the start of data representing additional information. When the mode signal is at the "L" level, additional information is represented by the level of a control signal f. The binarized output is controlled in such a manner that the spacing of black pixels becomes an odd number of pixels in a low-density area of the formed image in a case where the control signal f is at the "L" level and an even-number of pixels in the low-density area of the formed image in a case where the control signal f is at the "H" level. In other words, the additional information is expressed by indicating "0" when the spacing of black pixels is an odd number and "1" when the spacing of black pixels is an even number.

REFERENCES:
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patent: 5363202 (1994-11-01), Udagawa et al.
patent: 5448656 (1995-09-01), Tanaka
patent: 5550647 (1996-08-01), Koike
patent: 5557412 (1996-09-01), Saito et al.
patent: 5587808 (1996-12-01), Hagihara et al.
patent: 5617216 (1997-04-01), Wada

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