Image processing apparatus and image processing method

Details Image processing apparatus and image processing method Image processing apparatus and image processing method

2005-07-12

2005-07-12

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003030, C382S251000, C382S252000

Reexamination Certificate

active

06917446

ABSTRACT:
An image processing apparatus for quantizing image data indicative of a density gradation level of a constituent pixel of an image into a discrete value on the basis of quantization levels of a number smaller than the maximum density gradation level and not smaller than two. The apparatus comprises: an N-level/M-level quantization circuit for quantizing image data of an object pixel on an N-level basis or on an M-level basis; an error diffusion circuit for distributing an error generated through the N-level quantization or the M-level quantization to peripheral pixels around the object pixel; an N-level quantization threshold setting circuit for setting an N-level quantization threshold in a periodically variable manner; and a process setting circuit for causing the N-level/M-level quantization circuit to perform the M-level quantization for pixels adjacent to a pixel corresponding to either or both of a peak point and a saddle point in the periodic variation of the N-level quantization threshold and causing the N-level/M-level quantization circuit to perform the N-level quantization for pixels corresponding to the peak point and the saddle point.

REFERENCES:
patent: 2001/0028726 (2001-10-01), Miyake
patent: 6-70170 (1994-03-01), None
patent: 11-136510 (1999-05-01), None
patent: 2001257880 (2001-09-01), None
JPO Office Action dated Dec. 16, 2002.
Translation of JPO Office Action dated Dec. 16, 2002.

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