Signal processing unit having a digital circuit for...

Details Signal processing unit having a digital circuit for... Signal processing unit having a digital circuit for...

2004-09-21

2008-12-30

Haskins, Twyler L (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S445000, C358S463000

Reexamination Certificate

active

07471416

ABSTRACT:
There is described a signal processing apparatus, which conducts processing of a signal outputted from an image capturing element that converts an optical image obtained by irradiating light on an object such as document to an electric signal. The apparatus includes: a sample-and-hold section to sample and hold a black signal level and an image signal level, both included in an analogue image signal inputted from an image capturing element; an analogue-to-digital converting section to convert the analogue image signal to digital image data within a predetermined number of conversion steps, which is larger than a number of conversion steps corresponding to a differential value between the black signal level and the image signal level; and a digital subtracting section to subtract black digital-image data representing the black signal level from signal digital-image data representing the image signal level, both being converted by the analogue-to-digital converting section.

REFERENCES:
patent: 5402249 (1995-03-01), Koseki et al.
patent: 5748335 (1998-05-01), Honma et al.
patent: 5781312 (1998-07-01), Noda
patent: 6961151 (2005-11-01), Nara
patent: 7161626 (2007-01-01), Nara
patent: 7336394 (2008-02-01), Tsujimoto
patent: 10-233903 (1998-09-01), None
patent: 2002-057581 (2002-02-01), None

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