Quantization apparatus and method, and inkjet printing...

Details Quantization apparatus and method, and inkjet printing... Quantization apparatus and method, and inkjet printing...

2008-01-01

2008-01-01

Rogers, Scott A. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003050, C358S003220, C382S252000

Reexamination Certificate

active

10417088

ABSTRACT:
It is an object of this invention to provide a ternary or higher-order quantization method which avoids close gathering of pixels at a first output level. First and second threshold values Lth1and Lth2for ternarization and output values 0 (blank), 1, and 2 as converted output values are set to have a relationship of output value of 0 (blank)<first threshold value Lth1<second threshold value Lth2<output value of 1<output value of 2. This prevents a quantization error from becoming 0 when an input pixel value is an intermediate value, and prevents continuous outputting of only pixels having the output value of 1. When this image is printed, small ink dots corresponding to the output value of 1 are not easily continuously printed. This improves the image quality.

REFERENCES:
patent: 6061145 (2000-05-01), Kanda et al.
patent: 6757079 (2004-06-01), Chen
patent: 6943918 (2005-09-01), Kakutani
patent: 2002/0051023 (2002-05-01), Teshigawara et al.
patent: 9-247446 (1997-09-01), None
patent: 2001-292321 (2001-10-01), None
patent: 2002-77608 (2002-03-01), None

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