Appeal No. 96-0113
Application 07/848,779
patterns is generated simultaneously by minimizing an ensemble
cost function.
Representative claims 1 and 11 are reproduced below:
1. Method for generating a halftone image with a
computer comprising:
providing a set of correlated minimum visual modulation
two-dimensional binary patterns, each pattern
corresponding to one density level of a digital input
signal, the set of patterns being generated
simultaneously by minimizing an ensemble cost function
which is the variance of non-zero spatial frequencies
weighted by a human visual system modulation transfer
function; and
modularly addressing the patterns to select bits to
form the halftone pattern.
11. Halftoning apparatus comprising:
digital scanner means for generating from source
material a digital signal representing density levels (gray
levels) of pixels in the source material;
computer means programmed to operate upon the digital
signal from the scanner to generate a set of correlated
minimum visual modulation two-dimensional binary
patterns, each pattern corresponding to one density
level of the digital input signal, the set of patterns
being generated simultaneously by minimizing an
ensemble cost function which is the variance of non-
zero spatial frequencies weighted by a human visual
system modulation transfer function; the computer
further programmed to address modularly the patterns to
select bits to [sic] from the halftone pattern; and
marking engine means driven by the computer to create a
halftone image.
Opinion
-3-
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007