Image reading apparatus with correction of two-dimensional shadi

Details Image reading apparatus with correction of two-dimensional shadi Image reading apparatus with correction of two-dimensional shadi

1991-06-11

1992-04-07

Grimley, A. T.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

355228, 355233, 355327, 358474, 358487, H04N 100

Patent

active

051033208

ABSTRACT:
An image reading apparatus reads an optical image which is projected onto a predetermined plane by a slide projector. The image reading apparatus includes a scanner for optically scanning the optical image formed by the slide projector and for generating image information, a filter for eliminating a high frequency component of the image information and for outputting a low frequency component of the image information, a memory for sampling the low frequency component of the image information corresponding to each predetermined number of pixels when a predetermined reference optical image is formed by the slide projector, and for storing the sampled low frequency component of the image information as reference data, and a correcting circuit for correcting the two dimensional shading including the image information supplied from the scanner means for every pixel based on the reference data stored in the memory so that the low frequency component is deleted from the image information.

REFERENCES:
patent: 4027962 (1977-06-01), Mailloux
patent: 4043656 (1977-08-01), Cherian
patent: 4063810 (1977-12-01), Mailloux
patent: 4111540 (1978-09-01), Bollman
patent: 4120580 (1978-10-01), Mailloux et al.
patent: 4216495 (1980-08-01), Neilson et al.
patent: 4520395 (1985-05-01), Abe
patent: 4760464 (1988-07-01), Sakano
patent: 4831458 (1989-05-01), Watanabe

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