Method and apparatus for resolution enhancement by synthesis of scan signals
AssigneeOce-Technologies B.V.
InventorsWilhelmus J. Couwenberg, Johannes W. M. Jacobs
Life of this patent
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Abstract
Digital image data of high resolution are obtained by synthesizing the scanning signals of two scanners, which scan an original document with mutually different lower resolutions. The synthesis includes transforming the scan signals of the first scanner into a first spectrum and transforming the scan signals of the second scanner into a second spectrum, superposing in predetermined manner versions of the first and second spectrum shifted over the spectral axis, and deriving a third spectrum from the result thereof. Retransformation of the third spectrum produces digital image data with a high resolution.
Claims20
A method of generating digital image data, comprising:
- generating first digital image data by scanning an image with a first scanner having a first resolution f1;
- generating second digital image data by scanning the image with a second scanner having a second resolution f2 higher than f1;
- and
- combining the first and second digital image data to form third digital image data, which describe the image with a third resolution f3 which is higher than f1 and higher than f2.
An apparatus for generating digital image data, comprising
- means for scanning an image with a first resolution f1 to generate first digital image data;
- means for scanning the image with a second resolution f2 to generate second digital image data, wherein the second resolution f2 is higher than f1;
- and
- means for combining the first and second digital image data, relating to a same portion of the image, to produce third digital image data, which describe the image with a third resolution f3 higher than f1 and higher than f2.
A method of generating digital image data, comprising:
- scanning an image with a first scanner having a first resolution f1 to generate first digital image data;
- scanning the image with a second scanner having a second resolution f2 which is higher than f1 to generate second digital image data;
- transforming the first and second digital image data into a frequency domain;
- combining the transformed first and second data, including superposing the transformed first and second data, in the frequency domain;
- and
- retransforming the combined data from the frequency domain to form third digital image data, which describe the image with a third resolution f3 which is higher than both f1 and f2.
Dependencies are inferred from the claim text.