Image reading apparatus correcting noise in image data

Details Image reading apparatus correcting noise in image data Image reading apparatus correcting noise in image data

2004-12-27

2010-11-23

Tran, Douglas Q (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Scanning

C358S003260

Reexamination Certificate

active

07839545

ABSTRACT:
An image reading apparatus includes, with the purpose of accurately correcting noise in an image due to dust on a platen, three line sensors spaced from each other in a sub scanning direction to scan an original in the sub scanning direction, a platen between the original and the three line sensors, a moving mechanism for moving the platen, a noise detection processor detecting a noise pixels from each of multiple data output from the three line sensors, a selector selecting one of a plurality of search ranges defined with reference to the noise pixel, and a corrector extracting a reference pixel for correcting the noise pixel from the selected search range to correct the noise pixel based on the value of the extracted reference pixel.

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