Ex parte MARKANDEY et al. - Page 2




              Appeal No. 1997-1981                                                                                         
              Application No. 08/298,547                                                                                   


                                                    BACKGROUND                                                             

                     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                       
                     of:                                                                                                   
                            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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