Facsimile and static presentation processing – Natural color facsimile – Color correction
Reexamination Certificate
2011-07-12
2011-07-12
Thompson, James A (Department: 2625)
Facsimile and static presentation processing
Natural color facsimile
Color correction
C358S505000, C358S509000, C358S518000, C358S519000
Reexamination Certificate
active
07978384
ABSTRACT:
A construction is achieved at low cost which reduces the loss of gradation in a dark portion of an image that has been subjected to gamma correction in accordance with characteristics of a display. In an image reading apparatus, to make it possible to more finely reproduce the gradation in the dark portion, the number of gradations expressed by an signal obtained by a CCD is reduced by performing non-linear gamma correction using a gamma coefficient below one, and the resulting signal is transferred to a computer serving as a host computer. In the computer, the transferred signal is subjected to gamma correction using a gamma coefficient that is an inverse of the gamma coefficient used in the image reading apparatus, thereby canceling out the influence of the gamma correction performed in the image reading apparatus.
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Japanese Official Communication dated Feb. 17, 2009, regarding Japanese Application No. 2000-299221.
Kinumura Kengo
Takayama Tsutomu
Beckley Jonathan R
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Thompson James A
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