Image reader that stores sets of luminance correction data corre

Details Image reader that stores sets of luminance correction data corre Image reader that stores sets of luminance correction data corre

1997-09-18

1999-10-19

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358488, 358497, 358474, 358444, 358493, 355 25, 399362, H04N 104

Patent

active

059698292

ABSTRACT:
An image reader capable of outputting excellent quality read images, without illumination irregularities, similar to that of flat documents even when the document surface is curved as in the case of book-like documents. An image reader provided with a memory to store correction data to correct differences of illumination of each pixel of a document image, and which corrects the read information of each pixel in a document image using correction data corresponding to the measured height of a document surface among correction data stored in the memory. For one aspect, this image reader is constructed so as to correct a group of read information corresponding to a set of pixels arrayed in one direction by excluding specific frequencies among the illumination distribution from the set.

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patent: 5764383 (1998-06-01), Saund et al.
patent: 5831750 (1998-11-01), Okisu et al.

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