Image input device for generating a video signal for an image re

Details Image input device for generating a video signal for an image re Image input device for generating a video signal for an image re

1991-02-22

1993-03-30

Razavi, Michael T.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 80, 358 22, H04N 904

Patent

active

051988925

ABSTRACT:
An image input device for imaging an object includes a process circuit which has a negative/positive inversion function for forming a luminance signal and color difference signals to reproduce a negative image from pixel signals corresponding to the object or for forming the luminance signal and the color difference signals to reproduce a positive image from the pixel signals corresponding to the object. An image of the object may be reproduced in the image input device as a video signal in a blue-back mode by a blue-back circuit. The blue-back circuit processes the luminance signal and the color difference signals so that a portion of the object is forcibly colored blue or a family color when the level of the luminance signal outputted from the process circuit is within a predetermined range. Also, the blue-back circuit processes the luminance signal and the color difference signals so that a high brightness portion of the object is forcibly set to a white level or a family color when the level of the luminance signal outputted from the process circuit exceeds the predetermined range. As a result, the image object may be reproduced in the blue-back mode so that an illegible object can be displayed as a legible document.

REFERENCES:
patent: 4613906 (1986-09-01), Tanaka et al.
patent: 4635101 (1987-01-01), Nakayama
patent: 4734763 (1988-03-01), Urabe et al.
patent: 4829371 (1989-05-01), Hiramatsu et al.

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