Image reading apparatus for detecting noise in image data

Details Image reading apparatus for detecting noise in image data Image reading apparatus for detecting noise in image data

2004-12-27

2009-06-23

Poon, King Y (Department: 2625)

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

C358S464000, C382S275000

Reexamination Certificate

active

07551326

ABSTRACT:
An image reading apparatus includes, with the purpose of detecting noise in an image due to dust on a platen, three line sensors, a platen between an original and the line sensors, a moving mechanism for moving the platen, a noise detection processor detecting noise pixels from multiple data output from the line sensors, an order determination unit determining the order in which the noise pixel is detected, based on the order in which the line sensors are arranged and the direction in which the platen is moved, and a noise length calculator predicting the noise length in the sub scanning direction based on the number of noise pixels successive in the main scanning direction, the original transport rate, the platen moving rate, and the distance between the line sensors.

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