Appeal No. 1997-4047 Page 13
Application No. 08/309,508
on the Y component of Y, Cr, Cb color signals.” (Reply Br. at
7.) The examiner replies, “Walowit does disclose at column 10,
lines 12-16 and lines 24-26 that two chromatic components may
be adjusted and may include Y as one of those components.”
(Examiner’s Answer at 12.) We agree with the appellant.
Claim 3 specifies in pertinent part the following
limitation: “compensating Y component of converted Y,Cr,Cb
color signals ....” Persons skilled in the art would have
known that in the YCrCb color space, picture data are “made up
of a luminance signal component Y and chorominance signal
components Cr and Cb.” U.S. Patent No. 5,126,857, col. 1, ll.
46-48
(June 30, 1992). Such persons also would have known that the
luminance signal component, Y, is a monochrome signal, Milton
S. Kiver et al., Television Electronics: Theory and Servicing
77 (8th ed. 1983); i.e., the component is achromatic. In view
of this knowledge, the limitation requires changing the
luminance signal component Y of converted YCrCb color signals.
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