Method of determining threshold arrangement for generating...

Details Method of determining threshold arrangement for generating... Method of determining threshold arrangement for generating...

2005-08-16

2005-08-16

Rogers, Scott A. (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003200, C358S003260

Reexamination Certificate

active

06930801

ABSTRACT:
A threshold arrangement capable of reducing a moiré pattern produced by an interference between the output resolution and halftone frequency of an image outputting apparatus is determined. Halftone dot image data is generated by a threshold arrangement determined up to a certain gradation, and low-frequency component data is extracted from the halftone dot image data by an FFT, a LPF, and an IFFT. The position of a threshold where the extracted low-frequency component data is smaller is determined as the position of the threshold for a next gradation. The process of determining the position of the threshold is a process in a real space, and can determine the position of the threshold for the next gradation accurately. The threshold arrangement thus determined minimizes a moiré pattern which is an unwanted low-frequency component in a gradation image that is generated using the threshold arrangement.

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Adobe Press Mountain View California; “Post Screening” Peter Fink; published by MDN Corporation Aug. 11, 1994; pp. 97-106 Japanese Version and pp. 89-98 the English version.
IEEE Transactions on Systems, Man, and Cybernetics; “Design of Minimum Visual Modulation Halftone Paterns” J. Sullivan, et al.; vol. 21; No. 1; pp. 33-38; 1991.

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