Method for correcting image signal deteriorated by flare and ima

Details Method for correcting image signal deteriorated by flare and ima Method for correcting image signal deteriorated by flare and ima

1991-09-30

1993-05-04

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 42, 358483, 358447, G06K 945

Patent

active

052088740

ABSTRACT:
A method for correcting image information deteriorated by flare generated in an image reading unit having a light source for irradiating a document, a scanning system optically scanning the document irradiated by the light source and outputting the image information, and a reference image having a predetermined density distribution is provided. The method includes the following steps of: optically scanning the reference image irradiated by the light source, the scanning system outputting reference image information corresponding to the reference image; generating a function denoting a response with respect to the deterioration of the image information caused by the flare based on the reference image information obtained by the scanning system; optically scanning the document irradiated by the light source by the scanning system; and performing a deconvolution operation in which the image information obtained by the scanning system and the above function are used.

REFERENCES:
patent: 4728791 (1988-03-01), Goto
patent: 4806780 (1989-02-01), Yamamoto et al.
patent: 4891829 (1990-01-01), Deckman et al.
patent: 4959736 (1990-09-01), Mino et al.
patent: 4987450 (1991-01-01), Yamada et al.
patent: 5050226 (1991-09-01), Collet-Billon

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