Ex parte MARKANDEY et al. - Page 2
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Appeal No. 1997-1981
Application No. 08/298,547
The appellants’ invention relates to a process for forming image scaling filters which
may be used to scale an image either up or down in size. An understanding of the
invention can be derived from a reading of exemplary claim 1, which is reproduced below.
1. A method of forming an image scaling filter for converting a plurality
input elements to a different plurality of output elements comprising the steps
estimating a close to ideal frequency response without short cut-offs,
determining a set of filter coefficients based on the estimated close to
ideal frequency response,
scaling said filter coefficients so each set sums to 1;
multiplying input elements by said scaled filter coefficients; and
summing the multiplied input elements to achieve an output element.
The prior art references of record relied upon by the examiner in rejecting the
appealed claims are:
Niehaus 5,422,827 June 6, 1995
(filed Feb. 12, 1993)
Hartnett et al. (Hartnett), "On the Use of Cyclotomic Polynomial Prefilters for
Efficient FIR Filter Design," 41 IEEE TRANSACTIONS ON SIGNAL PROCESSING, no.
5, 1766-79 ( May 1993).
Nakamura et al. (Nakamura), “Fast Calculation of the Coefficients of the Generalized
McClellan Transform in 2-D FIR Filter Design”, IEEE 918-21 (1993).
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