Image processing method, image processor, image forming...

Details Image processing method, image processor, image forming... Image processing method, image processor, image forming...

2004-07-08

2009-08-04

Dang, Duy M (Department: 2624)

Image analysis

Image compression or coding

Adaptive coding

C382S162000, C382S232000

Reexamination Certificate

active

07570824

ABSTRACT:
Image data is transformed into spatial frequency components, the transformed spatial frequency components are quantized, a modification process of changing spatial frequency components in a predetermined frequency domain is performed on the quantized spatial frequency components, the spatial frequency components on which the modification process is performed are inverse-quantized, the inverse-quantized spatial frequency components are inverse-transformed into image data, and the number of gray levels in the inverse-transformed image data is reduced to two levels, four levels or other levels based on threshold values. A high-quality binary image, quaternary image, etc. are generated by solving the problem of tone gap which occurs in the vicinity of output levels of the image data and solving the texture caused in dithering and worms caused in error diffusion.

REFERENCES:
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patent: 2001-143066 (2001-05-01), None
patent: 2002-10085 (2002-01-01), None
patent: 2002-158879 (2002-05-01), None
“Threshold Control Technique for Error Diffusion Method”, Toshiaki Kakutani, Journal of the Society of Electrophotography, 1998, vol. 37, No. 2, p. 186-192.
“High Quality Image Processing for Ink Jet Printers”, T. Makita, Journal of the Image Society of Japan, 2001, vol. 40, No. 3, p. 239-243.

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