Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1993-11-01
1996-07-02
Wong, Peter S.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358298, 347183, 382254, 348625, H04N 121, H04N 123
Patent
active
055328288
ABSTRACT:
An image forming apparatus includes a dot forming unit responsive to a drive signal for forming a dot on a pixel when the drive signal is indicative of forming the dot to reproduce a halftone image. The apparatus further includes a drive signal generation circuit for generating the drive signal according to a video density signal, a deletion signal, an addition signal, and a directional signal. The deletion signal indicates that the video density signal of the pixel shows a shadow level and there is a first edge adjacent to the pixel in a first image around the pixel. The addition signal indicates that the video density signal of the pixel shows a highlight level and there is a second edge adjacent to the pixel in a second image around while the pixel, the directional signal indicates a direction of the first and second edges from the pixel. The drive signal is pulse-modulated by the video density signal. When the addition signal indicates an addition mode, a small dot is added at one of side portions of the pixel according to the directional signal. When the deletion signal indicates a deletion mode, one of side portions of dot which would be formed according to said video density signal is deleted according to the directional signal.
REFERENCES:
patent: 4368491 (1983-01-01), Saito
patent: 4544922 (1985-11-01), Watanabe et al.
patent: 4847641 (1989-07-01), Tung
patent: 4967283 (1990-10-01), Uchiyama et al.
patent: 5021937 (1991-06-01), Cohen
patent: 5438437 (1995-08-01), Mizoguchi et al.
Matsushita Electric - Industrial Co., Ltd.
Toatley , Jr. Gregory J.
Wong Peter S.
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