Image reading apparatus for obtaining a shading correction facto

Details Image reading apparatus for obtaining a shading correction facto Image reading apparatus for obtaining a shading correction facto

1995-10-10

1998-09-01

Couso, Yon J.

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358461, G06K 940, H04N 140

Patent

active

058022171

ABSTRACT:
An image reading apparatus comprises a reader for photo-electrically reading an image, a first reference member to be used for the measurement of irregularity of an output signal from the reader, a second reference member having density data indicating a density thereof recorded thereon, a correction unit for correcting irregularity of an image signal derived by reading an image of a document sheet by the reader based on a first reference signal derived by reading the first reference member by the reader, and a compensation unit for compensating the irregular correction operation by the correction unit based on a second reference signal derived by reading the second reference member by the reader and the density of the second reference member derived by reading the density data.

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