Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2011-05-24
2011-05-24
Poon, King Y (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S001900, C358S003060, C358S003090, C358S003140, C358S534000, C358S535000
Reexamination Certificate
active
07948659
ABSTRACT:
A halftoning device that converts an input pixel signal of 8 bits per pixel into an output pixel signal of r bits per pixel(r<8), the halftoning device includes: a gradation correction unit that expands the input pixel signal into an expanded pixel signal of n bits per pixel(n>8); a threshold value array storage that stores a threshold value array having a threshold value of 8 bits; and a threshold value expansion unit that expands the threshold value of 8 bits to expanded threshold value of n bits per pixel. A range of the expanded pixel signal output from the gradation correction unit is matched with a range of the expanded threshold value. The output pixel signal is set according to a comparison of the expanded pixel signal with the expanded threshold value corresponding to the threshold value that is selected for each input pixel signal.
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Japanese Office Action dated Aug. 25, 2009 and English translation thereof.
Kofuji Shiro
Sato Nobuyuki
Shibuya Takeshi
Urata Naoyuki
McGinn IP Law PLLC
Poon King Y
Ricoh & Company, Ltd.
Zhu Richard
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