Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
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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Ohta Eiji
Suzuki Yasumichi
Yamada Masanori
Canon Kabushiki Kaisha
Couso Yon J.
Nguyen Ha Tran
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