Method, processor and program for error diffusion modified...

Details Method, processor and program for error diffusion modified... Method, processor and program for error diffusion modified...

2005-10-18

2005-10-18

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003040, C358S003060

Reexamination Certificate

active

06956675

ABSTRACT:
The geometric texture and the graininess of an output image are improved in half tone processing using an error diffusion method. An image processing method where halftone processing is performed on input images using an error diffusion method including generating a sine wave where the amplitude and the frequency are modulated according to the average value of the target pixel value and the peripheral pixel values, adding the diffused quantization errors, the target pixel value and the sine wave, quantizing the addition result by a predetermined number of grayscale levels, and calculating the quantization errors of the peripheral pixels from the errors by quantization. By applying a disturbance sine wave by the error diffusion method, diffusion errors can be uniformly dispersed, and geometric texture and graininess can be improved.

REFERENCES:
patent: 5822464 (1998-10-01), Metcalfe
patent: 6173081 (2001-01-01), Nishikawa
patent: 6449061 (2002-09-01), Metcalfe
patent: 9-65126 (1997-03-01), None
Reiner Eschbach; “Reduction of artifacts in error diffusion by means of input-dependent weights”; Journal of Electronic Imaging; vol. 2(4); Oct. 1993; pp. 352-358.
Yasuhiko Kishimoto et al; “Improved error diffusion modified with AM/FM periodic noise”; IS&Ts NIP 15; 1999; pp 366-369.

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