Image analysis – Image transformation or preprocessing – Image storage or retrieval
Patent
1995-03-16
1998-03-24
Mancuso, Joseph
Image analysis
Image transformation or preprocessing
Image storage or retrieval
358516, 382298, 395889, G06K 954
Patent
active
057321655
ABSTRACT:
The invention provides a white level information correction apparatus for an image reading apparatus suitably used as an image scanner, which is improved in that analog to digital conversion can be performed effectively for originals of different ground colors with a high degree of accuracy. In the image reading apparatus, image information of a paper sheet being transported along a paper transport path is optically read at a fixed location of the paper transport path using an optical image reading unit and analog data obtained by the optical image reading unit are converted into digital data using white level information of the image information as an index to a conversion reference. The white level information correction apparatus comprises a plurality of storage apparatus for storing a plurality of pieces of white level information to be used as indices to the conversion reference, a data magnification variation apparatus for multiplying white level information from a storage apparatus by a coefficient to vary the magnification of the data, and a data write control apparatus for storing white level information varied in magnification by the data magnification variation apparatus into a storage apparatus to update the stored data.
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Amagai Tamio
Murai Yukako
Saito Keiichi
Suzuki Akio
Tabata Yoshio
Fujitsu Limited
Mancuso Joseph
Patel Jayanti K.
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