Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2006-06-20
2006-06-20
Lee, Thomas D. (Department: 2624)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003090
Reexamination Certificate
active
07064869
ABSTRACT:
A method for halftoning a multi-channel digital color image having an x,y array of color pixel values, wherein at least two color channels are similar having substantially the same color but with low- and high-densities, includes the steps of: providing a matrix of dither values for each group of similar color channels wherein two or more of the matrices of dither values are designed jointly to minimize a visual cos t function; for at least one group of similar color channels, forming an inverted matrix of dither values by subtracting the value of each element of the matrix of dither values for that group from a predetermined maximum value, associating the inverted matrix of dither values with one of the low- or high-density color channels, and associating the matrix of dither values for that group with the other low- or high-density color channel of that group; for each color channel of the multi-channel digital color image modularly addressing the matrix of dither values associated with that color channel using the location of a pixel in the digital color image to obtain ad addressed dither value; using the addressed dither value for each color channel, together with the pixel value for the corresponding color channel, to determine an output halftone image value for each color channel.
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XP-000901274, Color Halftoning with Blue Noise Masks, Qing Yu, Kevin J. Parker, and Meng Yao, The Fourth IS&T/SID Color Imaging Conference: Color Science, Systems and Applications, pp. 77-79.
Couwenhoven Douglas W.
Spaulding Kevin E.
Yu Qing
Brinich Stephen
Close Thomas H.
Eastman Kodak Company
Lee Thomas D.
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