Image analysis – Image enhancement or restoration – Artifact removal or suppression
Patent
1997-06-25
2000-01-11
Lee, Thomas D.
Image analysis
Image enhancement or restoration
Artifact removal or suppression
358474, 358493, 399362, G06K 940
Patent
active
06014470&
ABSTRACT:
An image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface, wherein the image distortion is rectified by duplicating image data that is a line of pixels in accordance with a varied amount of heights of a document surface, and a data conversion that is a image processing procedure in which the number of bits for pixels is reduced, is executed for the rectified image data. Data conversion elements whose number is the same as the maximum duplicated number "N", are arranged in a data conversion device, and the image data of a line to be duplicated arc input to the data conversion elements whose number is the same as duplicated number "n" of the line (n.ltoreq.N), and then, n-line image data which is processed in n data conversion elements, are stored in a memory. Thereby, reducing a memory capacity needed for the distortion rectification can be achieved without lowering picture quality.
REFERENCES:
patent: 5084611 (1992-01-01), Okisu et al.
patent: 5416609 (1995-05-01), Matsuda et al.
patent: 5585926 (1996-12-01), Fujii et al.
Lee Thomas D.
Minolta Co. , Ltd.
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