Image sensing method and apparatus

Details Image sensing method and apparatus Image sensing method and apparatus

1997-10-29

2000-12-19

Garber, Wendy

Television

Camera, system and detail

Optics

348222, 348229, 348279, 348296, 348342, 358483, 396 96, H04N 314, H04N 5235, H04N 5238

Patent

active

061633429

ABSTRACT:
When a selecting unit selects a second mode for sensing a document or the like, image signals obtained by exposing an exposing unit enters a second mode unit through a clamping unit and the selecting unit. High resolution image signals are generated in the second mode unit. Meanwhile, levels of the electrical image signals are detected by a detecting unit, and a control unit performs either exposure control by the exposing unit and gain control by a gain control unit or both in accordance with a peak level of the detected levels of the electrical image signals. At the same time, a correction unit sets a target value for the levels of the electrical image signals in accordance with a selected mode. The electrical image signals are controlled so that the detected levels approach the target value, thereby a document, an illustration, and the like can be sensed in high resolution and an image of high quality can be obtained regardless of character density in the document.

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patent: 4785330 (1988-11-01), Yoshida et al.
patent: 4843476 (1989-06-01), Fujioka
patent: 5079622 (1992-01-01), Toshinobu
patent: 5369507 (1994-11-01), Tanaka
patent: 5489945 (1996-02-01), Kannegundla
patent: 5579049 (1996-11-01), Shimaija et al.
patent: 5828406 (1998-10-01), Parulski

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