Image reading-out apparatus, copying machine and facsimile...

Details Image reading-out apparatus, copying machine and facsimile... Image reading-out apparatus, copying machine and facsimile...

2005-11-01

2005-11-01

Rogers, Scott A. (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S406000, C358S445000, C358S461000, C358S463000

Reexamination Certificate

active

06961151

ABSTRACT:
An image reading-out apparatus including a background level detecting circuit, an analog-to-digital converter, and a black-shading compensation circuit. The background level detecting circuit is configured to detect the background level of the original document from the image data. The analog-to-digital converter is configured to remove an influence due to the color of the background on the original document from the image data and configured to perform the analog-to-digital conversion of the image data in accordance with the detected background level. The black-shading compensation circuit is configured to perform black-shading compensation of the image data after the analog-to-digital conversion. The black-shading compensation circuit includes plural black level values calculating circuits which are configured to respectively obtain, per each one line, black level values employed for the black-shading compensation from the image data by use of respective different calculation members; a selection circuit which is configured to select and output one black level value among plural sorts of the black level values outputted by the plural black level values calculating circuits; and a subtracter which is configured to subtract the selected black level value from the image data after performing the analog-to-digital conversion and the black-shading compensation.

REFERENCES:
patent: 09154019 (1997-06-01), None

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