Appeal No. 95-1423
Application 07/928,883
discussed teachings of Nopp and Havel for the reasons stated
by
the Examiner. Claims 67 and 73 depend from claims 61 and 69
respectively, and further recite a “histogram-former.” Iwai
expressly teaches “a chromaticity histogram generator 40"
(col. 4, lines 26-28 and Fig. 3) for use in color mapping of a
color image display system. Because Nopp, Havel and Iwai are
all concerned with color image display systems, and more
specifically with conversion of color data, one of ordinary
skill in the art would consider their teachings together. It
would have been obvious to a skilled artisan to incorporate
the circuit of Iwai into the display system of Nopp as
modified by Havel in order to optimize control of hues for
better color contrast.
Claims 62 and 63 depend from claim 61 and further require
that the “output of said color transforming means is
retrocoupled to an input of said picture memory” (claim 62)
and the contents of the picture memory is stored as a bit map
(claim 63). Figure 1 of Iwai teaches a quantizer coupled to
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