Image processor and color image processor

Details Image processor and color image processor Image processor and color image processor

2005-06-14

2005-06-14

Nguyen, Madeleine (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003130, C382S167000

Reexamination Certificate

active

06906825

ABSTRACT:
A halftone processing section halftone-processes input image data using a plurality of dither threshold planes. An image output section having different output position accuracies between a main scan direction and a sub-scan direction outputs an image corresponding to halftone-processed image data. Each of the dither threshold planes consists of a plurality of the same unit threshold matrixes. In the unit threshold matrix, a relatively medium to high threshold array in a predetermined threshold range corresponding to the entire tone range of the input image data is an aperiodic array and an anisotropic array with neighboring thresholds having close values, in a direction coincident with a scan direction, in which the output position accuracy of the image output means is low. With this configuration, the image output section outputs an image having serial medium and high tone dots in the scan direction.

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Robert Ulichney; “The Void-and-Cluster Method For Dither Array Generation”; pp. 332-339; SPIE vol. 1913.

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