Image forming apparatus and method

Details Image forming apparatus and method Image forming apparatus and method

1997-03-12

1999-02-23

Lee, Thomas D.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358445, 358448, 382162, 382299, G03F 308

Patent

active

058750444

ABSTRACT:
An image forming apparatus and method produce, when 600 dpi image data is generated from 300 dpi image data, interpolated data of a pixel of interest by a two-value logical operation in a case where the image data about the periphery of the pixel of interest appertains to binary representation. When the image data is judged to appertain to an image of multivalued representation, the interpolated data of the pixel of interest is produced by a numerical operation. As a result, a 600 dpi picture of the same size can be printed and recorded in such a manner that outline sharpness and smoothness, which are characteristics possessed by a two-value image, are maintained at portions of the input 300 dpi image data that are two-value images while smoothness of the grayscale is maintained at portions of the input 300 dpi image data that are halftone images.

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Horak, "Interchanging Mixed Text Image Documents In the Office Environment," Computers & Graphics, vol. 7, No. 1, 1983, pp. 13-29.
Anderson et al., "Binary-image-manipulation algorithms in the Image View Facility," IBM Journal of Research & Development, vol. 31, No. 1, Jan. 1987, pp. 16-31.

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